Sources
15 feeds read automatically, all updating as expected as of 2026-11-02 11:56 UTC, and 201 sources considered in all. A feed is "not updating" when it has not answered or changed within its expected schedule; the waters it covers are hatched on the map until it recovers. How reports become statuses is on the methods page.
Source: feed health and the source registry from the export (sources.json), built 2026-11-02 11:56 UTC.
Feeds we read
-
- Feed id
ct-deep· registry: ct-deep-cso-dashboard- States
- CT
- Health
- last answered 2026-11-02 11:53 UTC; last fetched 2026-11-02 11:53 UTC
- Schedule
- Expected to answer at least every 6 hours
- Records
- 2,969 records · covers 22 tracked waters
- Licence
- none stated
- ct-deep-annual Updating
- Feed id
ct-deep-annual- States
- not stated
- Health
- last answered 2026-11-02 11:54 UTC; last fetched 2026-11-02 11:54 UTC
- Schedule
- Expected to answer at least every 400 days
- Records
- 6,741 records · covers 24 tracked waters
- Licence
- not stated
- ct-deep-archive Updating
- Feed id
ct-deep-archive- States
- not stated
- Health
- last answered 2026-11-02 11:54 UTC; last fetched 2026-11-02 11:54 UTC
- Schedule
- Expected to answer at least every 6 hours
- Records
- 6,942 records · covers 39 tracked waters
- Licence
- not stated
-
- Feed id
echo-cso-dmr-monthly· registry: fed-echo-effluent-charts-rest- States
- US
- Health
- last answered 2026-11-02 11:54 UTC; last fetched 2026-11-02 11:54 UTC
- Schedule
- Expected to answer at least every 7 days · the source says: Monthly DMR due the 15th of the following month; Holyoke Sept 2026 values received 15-Oct-26; ECHO refreshes weekly. Latency 2–7 weeks after the activity.
- Records
- 988 records · covers 82 tracked waters
- Licence
- EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data
-
- Feed id
echo-sewer-overflow· registry: fed-echo-sewer-overflow-bypass-events- States
- US
- Health
- last answered 2026-11-02 11:54 UTC; last fetched 2026-11-02 11:54 UTC
- Schedule
- Expected to answer at least every 7 days · the source says: "The data are refreshed daily." Lag from event start to received date in NE: median 2–3 days, 90th percentile 6–7 days (NH, MA), 38 days (RI). Legal basis is the 24-hour oral / 5-day written noncompliance report, not public notice.
- Records
- 105 records · covers 95 tracked waters
- Licence
- EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data
- Maine DEP Maine Combined Sewer Overflow Status Report (annual; latest = 2025 report, June 2026) Updating
- Feed id
me-dep-cso-annual· registry: me-dep-cso-status-report, me-dep-mepdes-cso-outfalls- States
- ME
- Health
- last answered 2026-11-02 11:54 UTC; last fetched 2026-11-02 11:54 UTC
- Schedule
- Expected to answer at least every 400 days · the source says: Annual; 2025 report dated June 30, 2026 (DEP index 6/30/2026); 2024 report 7/10/2025; 2023 report 6/18/2024. Latency 6-18 months after the discharges.
- Records
- 438 records · covers 24 tracked waters
- Licence
- maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated.
-
- Feed id
me-healthy-beaches· registry: me-mhb-geojson-site, me-mhb-geojson-bma, me-mhb-status-history- States
- ME
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 24 hours · the source says: Live; 'Monitoring Frequency' per site ('1 Week', '2 Week').
- Records
- 226 records · covers 12 tracked waters
- Licence
- maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated.
-
- Feed id
ma-massdep· registry: ma-massdep-csoapi, ma-massdep-sewage-notification-portal- States
- MA
- Health
- last answered 2026-11-02 11:54 UTC; last fetched 2026-11-02 11:54 UTC
- Schedule
- Expected to answer at least every 6 hours · the source says: Live; reflects permittee submissions immediately as far as observed (submittedDate equals the record's create time).
- Records
- 19,399 records · covers 53 tracked waters
- Licence
- EEA Data Portal disclaimer (eeaonline.eea.state.ma.us/portal#!/disclaimer, text read from the portal's custom.js): "The data contained in this public data portal has been retrieved through the agency's pre-existing data systems and/or existing hard copy documentation that have been converted into a data format. Although reasonable efforts have been made to make this data useful to the public, the data presented through this portal has not been fully verified for accuracy and/or completeness, and the agency assumes no obligation to either maintain or update any of the data contained on this website." and "This portal does not include all of the agency's regulatory data, and therefore should not be relied upon to determine overall compliance." No licence or reuse restriction stated.
-
- Feed id
ri-nbc· registry: ri-nbc-cso-api-pins, ri-nbc-cso-api-dryoverflows, ri-nbc-cso-api-geopins- States
- RI
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 6 hours · the source says: Live alarm feed from NBC's flow/level monitoring (Telog). Page JS has a disabled 60 s refresh; NBC 2022 launch note says overflows show 'as they occur' and stay visible up to 48 hours. On the check date every ACTIVATION_DATE was null (no overflow in the window).
- Records
- 1 record · covers 5 tracked waters
- Licence
- none stated
- nh-permittees Updating
- Feed id
nh-permittees- States
- not stated
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 6 hours
- Records
- 971 records · covers 10 tracked waters
- Licence
- not stated
- ri-dem-cyano Updating
- Feed id
ri-dem-cyano- States
- not stated
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 24 hours
- Records
- 25 records · covers 9 tracked waters
- Licence
- not stated
- ri-echo-dfr Updating
- Feed id
ri-echo-dfr- States
- not stated
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 7 days
- Records
- 53 records · covers 11 tracked waters
- Licence
- not stated
- ri-ridoh-beaches Updating
- Feed id
ri-ridoh-beaches- States
- not stated
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 24 hours
- Records
- 1,130 records · covers 24 tracked waters
- Licence
- not stated
-
- Feed id
vt-dec· registry: vt-dec-sewage-overflow-public-alerts, vt-dec-sewage-overflow-incident-reports, vt-anr-sewage-overflows- States
- VT
- Health
- last answered 2026-11-02 11:56 UTC; last fetched 2026-11-02 11:56 UTC
- Schedule
- Expected to answer at least every 6 hours · the source says: Operator-entered in real time. Law: alert 'as soon as possible, but no longer than one hour from discovery' (four hours if no phone/internet at the site). DEC: 'Once submitted, the Public Alert will be immediately available for public viewing'. Observed latencies 2026: Vergennes CSO#002 began 9:00 pm 4/16, alert 9:33 pm; Burlington Park St CSO began 5:02 pm 8/8, alert 6:11 pm; Montpelier CSOs began ~5:35 pm 6/10, alert 6:11 am 6/11; St Johnsbury CSO-06 began 10:55 pm 10/13, alert 9:41 am 10/14 (discovery time is not published, so whether a deadline was missed cannot be judged).
- Records
- 3,420 records · covers 19 tracked waters
- Licence
- Page footer: "Copyright © 2025 State of Vermont. All rights reserved" with links to Accessibility Policy and Privacy Policy. No data licence stated on the WWInventory pages. (Public record under 10 V.S.A. § 1295; ANR open data elsewhere is under the Vermont Open Geodata Policy v1.1.)
- vt-advisories Updating
- Feed id
vt-advisories- States
- not stated
- Health
- last answered 2026-11-02 11:55 UTC; last fetched 2026-11-02 11:55 UTC
- Schedule
- Expected to answer at least every 6 hours
- Records
- 136 records · covers 9 tracked waters
- Licence
- not stated
Every source considered
The registry: every source the research found, used or not, with its role and licence. Rows with a feed are read automatically; the rest are watched, used by hand or set aside.
Connecticut
- Aspetuck Health District (formerly Westport Weston HD) beach results (Compo, Burying Hill)not polled
advisories · municipal · html · licence: none stated · Aspetuck Health District
- BEACON map layers 'WQP_Beaches' (beach lines, monitoring stations, states, counties, tribal areas)not polled
advisories · federal · arcgis · beach_advisory · cadence: Annual (data last edited 2026-08-04) · licence: Item licenseInfo 'NA'; accessInformation 'US EPA'. EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html · US EPA Office of Water (ArcGIS owner skocher_EPA2)
-
outfalls · state · html · cadence: Content last updated: March 30, 2026 · licence: none stated · CT DEEP
-
outfalls · state · arcgis · licence: per item; most CSO/bypass items state none · CT DEEP
- CT DEEP Beach Monitoring pagenot polled
advisories · state · html · licence: none stated · Connecticut Department of Energy and Environmental Protection
-
events · state · arcgis · sso, bypass · cadence: frozen; dataLastEditDate 2021-12-02 · licence: none stated on the page or item (checked) · CT DEEP
-
outfalls · state · arcgis · cso · cadence: static (no edit date) · licence: copyrightText 'CT DEEP'; no licence text · CT DEEP
-
events · state · arcgis · cso · cadence: frozen · licence: none stated on the page or item (checked) · CT DEEP
-
advisories · state · html · cso, sso · licence: none stated · Connecticut Department of Energy and Environmental Protection
- CT DEEP CT_CSO_20160209 (2016 CSO locations; feeds the DEEP CSO Right-to-Know instant app)not polled
outfalls · state · arcgis · cadence: static, 2016 · licence: copyrightText 'CT DEEP' · CT DEEP
-
events · state · api · cso, sso · cadence: 'about once a month' (rowsUpdatedAt 2026-10-14) · licence: Public Domain (dataset metadata) · CT DEEP Emergency Response and Spill Prevention Division
-
outfalls · state · arcgis · cadence: periodic ICIS pulls (2026-01-14) · licence: none stated on the page or item (checked) · CT DEEP (from EPA ICIS-NPDES)
-
events · state · api · cso, sso, bypass · cadence: Operators must file within 2 h and update daily (CGS 22a-424a(c)(2)); rows appear as filed (QAlert -> Zoho sync latency not measured). 4,142 CSO rows and 2,275 SSO rows from 2021-12-01 to 2026-11-01; 2026 YTD: 723 CSO, 393 SSO; Q4 2026 to date: 45 CSO, 17 SSO. · licence: No terms of use found on the dashboard; footer links 'Terms of Use | Privacy Statement' point to wilco.org (Williamson County TX) template pages - vendor boilerplate, not DEEP terms. Zoho Analytics page carries no licence. · CT DEEP (vendor QScend Technologies; Zoho Analytics white-label analytics.momixpc.com)
-
advisories · state · html · licence: none stated · Connecticut Department of Energy and Environmental Protection
-
advisories · state · html · licence: none stated · CT DEEP
- CT DEEP Sewage Right-to-Know annual reports (xlsx event reports + PDF overview), 2022-2026not polled
events · state · csv · cadence: annual, due February 1 (CGS 22a-424a(c)(5)) · licence: none stated on the page or item (checked) · CT DEEP
-
advisories · state · pdf · licence: none stated · Connecticut Department of Public Health and Connecticut Department of Energy and Environmental Protection
- CT DPH/DEEP Guidelines for Monitoring Swimming Water and Closure Protocol (March 2016) - DPH copynot polled
advisories · state · pdf · licence: none stated · Connecticut Department of Public Health and Connecticut Department of Energy and Environmental Protection
- data.ct.gov (Socrata) catalog searchnot polled
events · state · api · licence: none stated · State of Connecticut
- DEEP Cyanobacteria Blooms pagenot polled
advisories · state · html · cadence: Content last revised August 11, 2026 · licence: none stated · CT DEEP
-
advisories · state · html · cadence: weekly sampling, Mon-Fri status updates in season · licence: none stated · CT DEEP (ctparks.com)
-
outfalls · federal · arcgis · licence: none stated · US EPA Region 1
-
monitoring · nonprofit · html · licence: none stated · FRWA
-
monitoring · nonprofit · api · licence: none stated · Earthplace Harbor Watch
-
monitoring · nonprofit · html · cadence: weekly in season (Apr-Sep newsletter) · licence: not checked (Privacy, Security, and Terms page exists) · Connecticut River Conservancy with FRWA, Scantic River Watershed Assn and others
-
advisories · municipal · html · licence: none stated · Ledge Light Health District
-
advisories · state · pdf · licence: none stated · Connecticut Department of Public Health
Maine
-
advisories · state · arcgis · shellfish_closure · cadence: Classification layer; emergency layer populated during emergency closures. · licence: copyrightText: 'Maine Department of Marine Resources, Bureau of Public Health & Aquaculture'. · Maine DMR Bureau of Public Health & Aquaculture
-
outfalls · state · arcgis · licence: none stated · State of Maine (maine.maps.arcgis.com)
-
advisories · state · html · licence: none stated · Maine DEP / Maine Healthy Beaches
- Maine DEP cyanobacteria bloom reports (Survey123 results layer) and Maine Cyanobacteria Dashboardnot polled
advisories · state · arcgis · hab · cadence: As reports arrive; DEP staff set report_status. · licence: Item licenseInfo empty (per sibling project). · Maine DEP Lakes Program
- Maine DEP Maine Combined Sewer Overflow Status Report (annual; latest = 2025 report, June 2026)feed: me-dep-cso-annual
events · state · pdf · cso · cadence: Annual; 2025 report dated June 30, 2026 (DEP index 6/30/2026); 2024 report 7/10/2025; 2023 report 6/18/2024. Latency 6-18 months after the discharges. · licence: maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated. · Maine Department of Environmental Protection
-
outfalls · state · arcgis · cso · cadence: Service text: 'All location data was quality checked by MEDEP MEPDES Inspectors and GIS Unit staff in 2018. Updates will occur as necessary.' Item modified 2025-10-16, but STATUS still reflects end of 2023 (111 active): GAUD CSO008 (closed 2024), KSTD CSO003/005 (2024) and Old Town CSO003/004 (2025) still show ACTIVE. · licence: ArcGIS item licenseInfo: 'No limitations'; accessInformation: 'Maine DEP GIS Unit'; MapServer copyrightText: 'Maine DEP DWQ and Maine DEP GIS Unit'. · Maine DEP GIS Unit
-
outfalls · state · arcgis · bypass, sso · licence: MapServer copyrightText: 'Maine DEP DWQ and Maine DEP GIS Unit'; outfall item licenseInfo empty. · Maine DEP GIS Unit
-
monitoring · state · arcgis · river_monitoring · cadence: Annual summaries; sample-level layer for 2024 only. · licence: none stated · Maine DEP VRMP with volunteer groups
-
advisories · state · html · shellfish_closure · cadence: Notices issued as conditions change; PDFs overwritten (no archive found). · licence: DMR page disclaimer: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability, or timeliness of any information published on this website'. · Maine Department of Marine Resources, Bureau of Public Health
-
advisories · academic · html · licence: none stated · Maine Healthy Beaches (UMaine Cooperative Extension / Maine DEP)
-
advisories · state · html · beach_advisory, beach_closure · cadence: Updated as advisories are posted and lifted. · licence: maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated. · Maine DEP, Maine Healthy Beaches Program
-
monitoring · state · api · beach_monitoring · cadence: Live; 'Monitoring Frequency' per site ('1 Week', '2 Week'). · licence: maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated. · Maine DEP, Maine Healthy Beaches Program
- Maine Healthy Beaches live status GeoJSON, beach management areas (mapdata_bma.geojson)feed: me-healthy-beaches
advisories · state · api · beach_advisory, beach_closure · cadence: Live; changes when a management entity posts or lifts an advisory. Results 'typically available the following day'. Season Memorial Day to Labor Day. · licence: maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated. Portal: 'This is a public resource provided by the Maine Department of Environmental Protection'. Disclaimer: 'Swim at your own risk. Water quality can change unexpectedly. Information on this site may not reflect current water quality conditions.' · Maine DEP, Maine Healthy Beaches Program (with towns/state parks as management entities)
-
monitoring · state · csv · beach_monitoring · cadence: Results 'typically available the following day'; season Memorial Day-Labor Day. · licence: maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated. · Maine DEP, Maine Healthy Beaches Program
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advisories · state · html · beach_advisory · cadence: Live in season. · licence: maine.gov: 'Neither the State of Maine, nor any agency, officer, or employee of the State of Maine warrants the accuracy, reliability or timeliness of any information published on the Maine.gov website ... Any person or entity that relies on any information obtained from this system does so at their own risk.' (https://www.maine.gov/portal/policies/disclaimer.html). No reuse licence stated. · Maine DEP
-
advisories · academic · html · licence: none stated · Maine Healthy Beaches
- Permittee annual 'CSO Activity and Volumes' spreadsheets filed with DEP (per event, per outfall)not polled
events · state · csv · cso · cadence: Annual, due March 1 for the prior year. · licence: none stated · Maine DEP (filed by each CSO permittee)
Massachusetts
- Blackstone River Watershed Council / Blackstone River Coalition monitoringnot polled
monitoring · nonprofit · licence: none stated · Blackstone River groups
-
advisories · municipal · html · cso · licence: none stated · Boston Public Health Commission
-
advisories · municipal · html · cyanobacteria · cadence: Event-driven news posts. · licence: Not checked. · Boston Public Health Commission
- Boston Public Health Commission CSO public health warning (example)not polled
advisories · municipal · html · licence: none stated · Boston Public Health Commission
- Boston Water and Sewer Commission CSO notification pagenot polled
advisories · utility · html · cso · licence: none stated · Boston Water and Sewer Commission
- Buzzards Bay Coalition Baywatchers data portalnot polled
monitoring · nonprofit · licence: none stated · Buzzards Bay Coalition
-
advisories · municipal · html · cyanobacteria · licence: none stated · Cambridge Public Health Department
- Charles River Watershed Association Flagging Program (boathouse flags, website, Public Flagging API)not polled
advisories · nonprofit · api · cso, hab, model_bacteria · cadence: Hourly model predictions in season (May to late October); off season the site shows no flags. Site banner seen today: 'The database has not updated in at least 24 hours.' · licence: API: 'CRWA allows open access to its Public Flagging API' (page wording). Code: MIT license (github.com/codeforboston/flagging). · Charles River Watershed Association (site built by Code for Boston)
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advisories · nonprofit · api · bacteria_model, cso, cyanobacteria · cadence: Hourly model; flags shown in boating season only. On 2026-11-01 the site said the database had not updated in at least 24 hours and it was not boating season. · licence: 'the CRWA allows open access to its Public Flagging API' (API page). · Charles River Watershed Association (site built by Code for Boston)
- Chicopee 4Rivers Watershed Councilnot polled
monitoring · nonprofit · licence: none stated · Chicopee 4Rivers
- City of Cambridge CSO advisory (March 2024)not polled
advisories · municipal · html · licence: none stated · City of Cambridge
-
advisories · municipal · html · cso · licence: none stated · City of Chicopee
-
advisories · municipal · html · cso · licence: none stated · City of Holyoke DPW
-
monitoring · nonprofit · html · bacteria · cadence: 'Monitoring typically occurs from late May to October'; 'Results are posted to this site's map within 24 hours after the sample was taken' (how-it-works page). Search results: weekly sampling at 13 MA and 8 CT locations. · licence: Not stated on pages read. · Connecticut River Conservancy
-
monitoring · nonprofit · html · licence: none stated · Connecticut River Conservancy
-
monitoring · nonprofit · html · licence: none stated · Connecticut River Conservancy
-
advisories · state · arcgis · cadence: Data last edited 2026-02-19. · licence: EEA and DCR 'make no representations or warranties ... with respect to the reuse of the data' (per sibling project). · MA DCR
-
advisories · state · arcgis · beach_closure, bacteria, cyanobacteria, cso_precaution · cadence: Layer data last edited 2026-11-01 17:49 UTC (editingInfo epoch 1793555384363), so it is still being refreshed; postings seasonal (May-Sept). · licence: None stated on item (licenseInfo empty). · MA DCR (GIS) from DPH data
- Deerfield River Watershed Association (samples via CRC Is It Clean)not polled
monitoring · nonprofit · licence: none stated · DRWA
-
advisories · federal · html · beach_closure · licence: none stated · US EPA
-
outfalls · federal · arcgis · cso · cadence: Static; last edit 2023-01-03. · licence: Not checked (federal). · US EPA Region 1
-
events · municipal · email · cso · cadence: per event · licence: none stated · City of Holyoke
- Housatonic Valley Association (MA monitoring)not polled
monitoring · nonprofit · licence: none stated · HVA
- Ipswich River Watershed Associationnot polled
monitoring · nonprofit · licence: none stated · IRWA
-
monitoring · nonprofit · html · licence: none stated · Connecticut River Conservancy
- Jones River Watershed Associationnot polled
monitoring · nonprofit · licence: none stated · JRWA
-
events · state · api · cso, cso_treated, partially_treated, blended, sso · cadence: Live; reflects permittee submissions immediately as far as observed (submittedDate equals the record's create time). · licence: EEA Data Portal disclaimer (eeaonline.eea.state.ma.us/portal#!/disclaimer, text read from the portal's custom.js): "The data contained in this public data portal has been retrieved through the agency's pre-existing data systems and/or existing hard copy documentation that have been converted into a data format. Although reasonable efforts have been made to make this data useful to the public, the data presented through this portal has not been fully verified for accuracy and/or completeness, and the agency assumes no obligation to either maintain or update any of the data contained on this website." and "This portal does not include all of the agency's regulatory data, and therefore should not be relied upon to determine overall compliance." No licence or reuse restriction stated. · MassDEP / EEA
-
outfalls · state · arcgis · cso · cadence: Items modified 2024-06-03. · licence: App 1dde2a22: 'This draft application and dataset is currently under development. It may not be complete, and may contain errors, omissions and other inaccuracies; it is subject to change for any reason.' · MassDEP GIS Program
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outfalls · state · arcgis · cso · cadence: Occasional; data last edited 2025-06-23. · licence: Item licenseInfo: 'Locations are estimates and should only be used as a guide.' ... 'The Commonwealth of Massachusetts Executive Office of Energy and Environmental Affairs (EEA) and MassDEP make no representations or warranties, express or implied, with respect to the reuse of the data or cartographic digital files provided herewith' ... 'Permission is granted to copy and use the materials herein.' (from the web app item 08c0019270254f0095a0806b155abcde) · MassDEP GIS Program
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events · state · api · cso, cso_treated, partially_treated, blended, sso · cadence: Permittee files a Public Notification Report within 18 hours of its public advisory (DEP how-to); statute: DEP displays within 24 hours of receipt. Observed (last 1,000 rows, Jul-Oct 2026): event start to portal submission median 6 h (New Bedford, Fall River, Lowell), 18 h (Springfield), 39 h (Holyoke); weekend events often filed Monday. Verified Data Reports by the 15th of the next month. · licence: EEA Data Portal disclaimer (eeaonline.eea.state.ma.us/portal#!/disclaimer, text read from the portal's custom.js): "The data contained in this public data portal has been retrieved through the agency's pre-existing data systems and/or existing hard copy documentation that have been converted into a data format. Although reasonable efforts have been made to make this data useful to the public, the data presented through this portal has not been fully verified for accuracy and/or completeness, and the agency assumes no obligation to either maintain or update any of the data contained on this website." and "This portal does not include all of the agency's regulatory data, and therefore should not be relied upon to determine overall compliance." No licence or reuse restriction stated. · MassDEP / EEA
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advisories · state · html · licence: none stated · Massachusetts Department of Public Health - Bureau of Climate and Environmental Health
-
advisories · nonprofit · html · licence: none stated · Merrimack River Watershed Council
- Millers River Watershed Councilnot polled
monitoring · nonprofit · licence: none stated · MRWC (Millers)
-
monitoring · nonprofit · arcgis · cadence: Twice monthly spring to fall, monthly in winter; posting lag not stated · licence: none stated · Merrimack River Watershed Council
-
events · utility · html · cso · licence: none stated · Massachusetts Water Resources Authority
- MWRA CSO discharge reporting pagenot polled
advisories · utility · html · cso · licence: none stated · Massachusetts Water Resources Authority
- MWRA final CSO public notification plannot polled
advisories · utility · html · licence: none stated · Massachusetts Water Resources Authority
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advisories · nonprofit · html · bacteria_model, cyanobacteria · cadence: Daily in boating season (per search). · licence: none stated · Mystic River Watershed Association
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advisories · nonprofit · api · model_bacteria, hab · cadence: Daily prediction at about 5 AM, 'valid for the rest of the day' · licence: none stated · Mystic River Watershed Association
- Nashua River Watershed Association monitoringnot polled
monitoring · nonprofit · licence: none stated · Nashua River Watershed Association
- Neponset River Watershed Association monitoringnot polled
monitoring · nonprofit · licence: none stated · Neponset River Watershed Association
- North and South Rivers Watershed Associationnot polled
monitoring · nonprofit · licence: none stated · NSRWA
- OARS (Assabet, Sudbury, Concord) monitoring and flaggingnot polled
monitoring · nonprofit · licence: none stated · OARS
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outfalls · state · api · partially_treated · licence: EEA Data Portal disclaimer (eeaonline.eea.state.ma.us/portal#!/disclaimer, text read from the portal's custom.js): "The data contained in this public data portal has been retrieved through the agency's pre-existing data systems and/or existing hard copy documentation that have been converted into a data format. Although reasonable efforts have been made to make this data useful to the public, the data presented through this portal has not been fully verified for accuracy and/or completeness, and the agency assumes no obligation to either maintain or update any of the data contained on this website." and "This portal does not include all of the agency's regulatory data, and therefore should not be relied upon to determine overall compliance." No licence or reuse restriction stated. · MassDEP
- Salem Sound Coastwatchnot polled
monitoring · nonprofit · licence: none stated · Salem Sound Coastwatch
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monitoring · academic · pdf · licence: none stated · University of Massachusetts Water Resources Research Center
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events · utility · html · cso, sso, partially_treated · cadence: Email per event (not seen); pages static · licence: none stated · Springfield Water and Sewer Commission (site contact is a veolia.com address)
-
advisories · utility · html · cso · licence: none stated · Springfield Water and Sewer Commission
- Taunton River Watershed Alliance / Save the Bay (MA side)not polled
monitoring · nonprofit · licence: none stated · TRWA
- Water Reporter / WQX submissions by MA groupsnot polled
monitoring · other · licence: none stated · various
- Westfield River Watershed Association (samples via CRC Is It Clean)not polled
monitoring · nonprofit · licence: none stated · WRWA
New Hampshire
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events · municipal · email · cso · cadence: unknown · licence: none stated · City of Berlin
- City of Nashua NH CSO page/FAQnot polled
advisories · municipal · html · cso · licence: none stated · City of Nashua
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monitoring · nonprofit · html · bacteria · cadence: Weekly at many sites in season (press: results ~24 h after sampling); some VT tributary sites stale (e.g. Black River at Mill Road last 2016). · licence: none stated · Connecticut River Conservancy with partner groups (Black River Action Team, White River NRCD, Ottauquechee River Group, Ashuelot River LAC)
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outfalls · federal · arcgis · cso · licence: copyrightText "CT: CT DEEP; ME: MEDEP; MA: MassDEP, EPA; NH: EPA; RI: Narragansett Bay Commission; VT Open Geodata Portal". NH rows: "Active CSO outfalls collected from NH NPDES permits. EPA made corrections based upon updated information available in EPA's files." VT rows from the VT Open Geodata Portal stormwater/wastewater infrastructure layer. · US EPA Region 1
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events · municipal · html · cso, sso, bypass · cadence: ad hoc · licence: none stated · Town of Exeter DPW
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events · municipal · email · cso · cadence: per event (presumed same text as web posts) · licence: none stated · City of Manchester
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events · municipal · html · cso · cadence: per event: an 'Activation' post, then a 'No Activations for 12 Hours' all-clear · licence: none stated · City of Manchester DPW EPD
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events · municipal · html · cso · cadence: semiannual/annual · licence: none stated · City of Manchester DPW EPD
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monitoring · nonprofit · arcgis · bacteria · licence: none stated · Merrimack River Watershed Council
- Nashua History of CSO Occurrences (PDF)not polled
events · municipal · pdf · cso · cadence: monthly update (stated) · licence: none stated · City of Nashua Wastewater Treatment Facility
-
events · municipal · email · cso · cadence: unknown · licence: none stated · City of Nashua
- NHDES Advisories pagenot polled
advisories · state · html · licence: none stated · NHDES
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advisories · state · html · cyanobacteria · licence: none stated · NHDES
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monitoring · state · html · licence: none stated · NHDES
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outfalls · state · arcgis · cso · licence: Service copyrightText "NHDES"; description "Environmental Data from NHDES"; no licence text on the layer. NHDES AGOL items carry the "screening purposes only. Distribution is discouraged." disclaimer. · NHDES
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advisories · state · arcgis · bacteria · cadence: Item snippet: 'Current advisories & alerts ... are posted & updated on this map daily.' Advisory 'approximately 24 hours after sampling' (NHDES Advisories page). Season roughly June to Labor Day; on 2026-11-01 all 93 read 'Monitoring Season Completed'. · licence: "User is required to read metadata completely before using the data. The information provided in this coverage is a subset of spatial databases developed by the New Hampshire Department of Environmental Services (NHDES). The data presented is under constant revision and may not depict the most up to date information. The NHDES is not responsible for the use or interpretation of this information, or for any inaccuracies in the site names, tax map and lot information, or locations. All information is subject to verification. These data are to be used for screening purposes only. Distribution is discouraged." (licenseInfo on items 8d84a6b03acb4efaab571b222c78447b and 083302ea9c904498a620930698be3340; accessInformation "NHDES") · NHDES Beach Inspection Program
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advisories · state · arcgis · cyanobacteria · cadence: Daily per item snippet; warnings issued after sampling; NHDES 'does not close waterbodies'. · licence: "User is required to read metadata completely before using the data. The information provided in this coverage is a subset of spatial databases developed by the New Hampshire Department of Environmental Services (NHDES). The data presented is under constant revision and may not depict the most up to date information. The NHDES is not responsible for the use or interpretation of this information, or for any inaccuracies in the site names, tax map and lot information, or locations. All information is subject to verification. These data are to be used for screening purposes only. Distribution is discouraged." (licenseInfo on items 8d84a6b03acb4efaab571b222c78447b and 083302ea9c904498a620930698be3340; accessInformation "NHDES") · NHDES Harmful Algal Bloom Program
-
advisories · state · email · cyanobacteria, bacteria · licence: none stated · NHDES
-
advisories · state · html · bacteria · licence: none stated · NHDES
-
events · municipal · html · cso · cadence: monthly, about 1 month lag · licence: none stated · City of Portsmouth DPW
- Portsmouth CSO email list (Mailchimp)not polled
events · municipal · email · cso · cadence: per event (automated) · licence: none stated · City of Portsmouth
Rhode Island
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events · federal · api · sso, bypass, cso (dry-weather only) · cadence: ICIS-NPDES extract weekly-ish (SystemExtractDate 10/30/2026 on check). Event appears after the operator's 5-day NeT-SewerOverflow report and state review; lag days to weeks. · licence: U.S. federal government data (public domain); ECHO asks users to cite it. · U.S. EPA (data reported by RI permittees via NeT-SewerOverflow / ICIS-NPDES)
- Narragansett Bay Commission CSO alarm mapnot polled
advisories · utility · html · cso · licence: none stated · Narragansett Bay Commission
-
events · utility · api · cso, dry_weather_overflow · cadence: Rows appear after NBC verification (here ~9 h after the event ended); rolling 30-day window. · licence: none stated · Narragansett Bay Commission
-
events · utility · api · cso · cadence: Live alarm feed from NBC's flow/level monitoring (Telog). Page JS has a disabled 60 s refresh; NBC 2022 launch note says overflows show 'as they occur' and stay visible up to 48 hours. On the check date every ACTIVATION_DATE was null (no overflow in the window). · licence: none stated · Narragansett Bay Commission
- NBC CSO Alarm Map web pagenot polled
events · utility · html · cso · cadence: live · licence: Footer "Copyright © 2026 Narragansett Bay Commission"; no data terms. · Narragansett Bay Commission
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outfalls · utility · api · cadence: static · licence: none stated · Narragansett Bay Commission
- Newport CSO FAQ (red-flag notification)not polled
events · municipal · html · cso · licence: none stated · City of Newport Utilities
-
advisories · state · html · licence: none stated · RI DEM
-
advisories · state · csv · licence: DEM site disclaimer (https://dem.ri.gov/disclaimer): "The compiled information presented on this WWW site is considered public information and may be distributed or copied. However, use of appropriate byline/photo/image credits is requested." · RIDEM
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advisories · state · email · licence: DEM site disclaimer (https://dem.ri.gov/disclaimer): "The compiled information presented on this WWW site is considered public information and may be distributed or copied. However, use of appropriate byline/photo/image credits is requested." · RIDEM
-
monitoring · state · arcgis · cadence: biweekly May-Oct plus responses · licence: none stated · RIDEM
-
advisories · state · pdf · licence: none stated · Rhode Island Department of Environmental Management
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advisories · state · html · shellfish_closure (rain, CSO, SSO, HAB) · cadence: Updated after each closure/reopening (last update 10/19/2026). · licence: DEM site disclaimer (https://dem.ri.gov/disclaimer): "The compiled information presented on this WWW site is considered public information and may be distributed or copied. However, use of appropriate byline/photo/image credits is requested." · RIDEM Office of Water Resources
- RIDEM press releases (and RSS)not polled
advisories · state · rss · shellfish_closure, no_contact_advisory, cyanobacteria · cadence: ad hoc · licence: DEM site disclaimer (https://dem.ri.gov/disclaimer): "The compiled information presented on this WWW site is considered public information and may be distributed or copied. However, use of appropriate byline/photo/image credits is requested." · RIDEM
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advisories · state · email · shellfish_closure · licence: DEM site disclaimer (https://dem.ri.gov/disclaimer): "The compiled information presented on this WWW site is considered public information and may be distributed or copied. However, use of appropriate byline/photo/image credits is requested." · RIDEM
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advisories · state · arcgis · cadence: annual (May/June notice) · licence: none stated on item (RIGIS_ADMIN) · RIDEM / RIGIS
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advisories · state · arcgis · cyanobacteria_advisory · cadence: Edited when advisories are posted/lifted; dataLastEditDate 2026-10-29. · licence: none stated on item; DEM site disclaimer applies · RIDEM Office of Water Resources with RIDOH
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monitoring · state · csv · bacteria_exceedance · cadence: weekly/biweekly in season, into October · licence: Page: "Information is reported by approved volunteer partners. RIDOH cannot endorse/verify specific observations." · RIDOH with Save The Bay, URI Watershed Watch, Clean Ocean Access
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advisories · state · csv · beach_closure, cyanobacteria_advisory · cadence: Edited by RIDOH when advisories are issued/lifted during the season (Memorial Day to Labor Day; 2026 monitoring ended per feed 2026-09-23). Typing errors present (e.g., 'Wawick', reopen '8/7/2027'). · licence: none stated (Google Sheet published for the web page); RI.gov policies apply to health.ri.gov. · RI Department of Health Beach Monitoring Program
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advisories · state · html · beach_closure · cadence: same day as decision · licence: RI.gov policies · RIDOH
- RIDOH Beach Closure Data pagenot polled
advisories · state · html · licence: none stated · Rhode Island Department of Health
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advisories · state · html · licence: none stated · Rhode Island Department of Health
-
advisories · state · html · licence: none stated · Rhode Island Department of Health
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advisories · state · html · licence: RI.gov policies · RIDOH
- RIDOH press releases RSSnot polled
advisories · state · rss · licence: RI.gov policies · RIDOH
-
advisories · state · pdf · licence: none stated · Rhode Island Department of Health
-
advisories · state · arcgis · cadence: Point layer data edited 2026-09-10; tables last edited 2026-05-05; lab data stop in 2018. · licence: none stated on items ('OPEN' on the 2017 web map) · RIDOH
-
outfalls · state · arcgis · cadence: occasional · licence: RIGIS item licence: "This dataset is provided 'as is.' ... Please acknowledge both RIGIS and the primary producer(s) of this dataset in any derived products." · NBC; RIGIS
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monitoring · nonprofit · html · licence: none stated · Save The Bay
- Surfrider RI Blue Water Task Forcenot polled
monitoring · nonprofit · api · licence: none stated · Surfrider Foundation RI Chapter
Vermont
- ANR DocBrowser wastewater permit foldersnot polled
outfalls · state · html · cso, sso · cadence: annual reports Jan-Aug · licence: none stated · VT DEC
- BTV Beach Status (Beach Closure Tracker)not polled
advisories · municipal · arcgis · beach_closure, cso, cyanobacteria · cadence: live Memorial Day to Labor Day · licence: none stated · City of Burlington Parks, Recreation & Waterfront / DPW
-
outfalls · state · pdf · cso · licence: none stated · VT DEC
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events · municipal · rss · bypass, cso · cadence: ad hoc, mainly plant discharges that close beaches · licence: none stated · City of Burlington DPW
- City of Burlington VT news flash on beach closures after a dischargenot polled
advisories · municipal · html · licence: none stated · City of Burlington
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monitoring · nonprofit · html · sample, model_bacteria · cadence: Weekly sampling May to October (Wednesday mornings at many sites); 'Results are posted to this site's map within 24 hours after the sample was taken.' · licence: none stated beyond site privacy/terms link · Connecticut River Conservancy (built with The Commons)
- Hartford WRJ 2025 CSO Annual Reportnot polled
outfalls · municipal · pdf · cso · cadence: annual · licence: none stated · Town of Hartford
-
outfalls · municipal · pdf · sso · cadence: annual · licence: none stated · Town of Middlebury
- Newport 2025 CSO Annual Reportnot polled
outfalls · municipal · pdf · cso · cadence: annual · licence: none stated · City of Newport
- St. Johnsbury 2025 CSO Annual Reportnot polled
outfalls · municipal · pdf · cso · cadence: annual · licence: none stated · Town of St. Johnsbury
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advisories · state · html · licence: none stated · Vermont Agency of Natural Resources
-
advisories · state · pdf · licence: none stated · Vermont Department of Health
-
advisories · state · pdf · licence: none stated · Vermont Department of Health
-
advisories · state · html · licence: none stated · Vermont Department of Health
- Vermont State Parks swim water results (Current Status of Vermont State Parks Recreational Water)not polled
advisories · state · pdf · bacteria, cyanobacteria · cadence: 'We test water weekly at all Vermont State Park swimming areas during the operating season'; testing 'ends no later than September 30'. On 2026-11-01 every site read Open (stale, off-season). · licence: none stated · VT Department of Forests, Parks and Recreation
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outfalls · state · arcgis · licence: Description: "Spatial data is not maintained and therefore, this dataset may not be complete." Vermont Open Geodata Policy v1.1. · VT DEC Wastewater Program (via ANR Open Data)
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outfalls · state · arcgis · cso · cadence: Static inventory; edits dated 2013-2020 in sample. · licence: copyrightText "Watershed Investment Division, VT DEC"; description: "Accuracy of all data is for planning purposes and field verification is at the users discretion." Portal terms: Vermont Open Geodata Policy v1.1. · VT DEC Watershed Investment Division (via ANR Open Data)
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events · state · html · cso, sso, bypass, partially_treated, other · cadence: Operator-entered in real time. Law: alert 'as soon as possible, but no longer than one hour from discovery' (four hours if no phone/internet at the site). DEC: 'Once submitted, the Public Alert will be immediately available for public viewing'. Observed latencies 2026: Vergennes CSO#002 began 9:00 pm 4/16, alert 9:33 pm; Burlington Park St CSO began 5:02 pm 8/8, alert 6:11 pm; Montpelier CSOs began ~5:35 pm 6/10, alert 6:11 am 6/11; St Johnsbury CSO-06 began 10:55 pm 10/13, alert 9:41 am 10/14 (discovery time is not published, so whether a deadline was missed cannot be judged). · licence: Page footer: "Copyright © 2025 State of Vermont. All rights reserved" with links to Accessibility Policy and Privacy Policy. No data licence stated on the WWInventory pages. (Public record under 10 V.S.A. § 1295; ANR open data elsewhere is under the Vermont Open Geodata Policy v1.1.) · Vermont Department of Environmental Conservation, Watershed Management Division, Wastewater Program
- VT DEC sewer overflow and release Incident Reports (New/pending, Reviewed, and Wet Weather CSO tables) on the Sewage Overflows report pagefeed: vt-dec
events · state · html · cso, sso, bypass, partially_treated, other · cadence: Law: report to DEC and local health officer within 12 hours of discovery; end time and volume amended within three business days if unknown. Reviewed rows appear after DEC staff review (days to weeks; some pending rows from 12/28/2025 were still 'In Review' on 11/01/2026). · licence: Page footer: "Copyright © 2025 State of Vermont. All rights reserved" with links to Accessibility Policy and Privacy Policy. No data licence stated on the WWInventory pages. (Public record under 10 V.S.A. § 1295; ANR open data elsewhere is under the Vermont Open Geodata Policy v1.1.) · Vermont Department of Environmental Conservation, Wastewater Program
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advisories · state · arcgis · cyanobacteria · cadence: As filed (weekly per site). · licence: none stated · Vermont Department of Health
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advisories · state · arcgis · cyanobacteria · cadence: Weekly site observations early June to early October; reports reviewed before posting. Page: 'Test site observations and samples are collected once each week. Conditions can and do change.' · licence: Item licenseInfo and accessInformation null; tracker page states no terms. · Vermont Department of Health (with VT DEC and Lake Champlain Committee)
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advisories · state · html · licence: none stated · Vermont Department of Health
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events · state · email · cso, sso, bypass, other · cadence: Push on submission (inferred from page text). · licence: none stated · VT DEC Watershed Management Division
Federal, regional and other
- Buffalo Sewer Authority 'Real-Time Sewer Overflow Status' (CSOPublicNotification_ReadOnly)not polled
advisories · utility · arcgis · cso · cadence: model/forecast driven; the Message on 2026-11-01 still described an Oct 27 forecast, so updates lag or are event-triggered · licence: none stated · Buffalo Sewer Authority
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advisories · federal · html · licence: public domain (U.S. federal government work); no licence line on page · Centers for Disease Control and Prevention
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outfalls · federal · api · licence: per dataset · GSA data.gov (harvested agency records)
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advisories · state · arcgis · hab · cadence: season May-Oct (2026 season announced in May press release); edits a few times a week · licence: none stated · NYS DEC HABs Program
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events · state · html · cso, sso, bypass, partially_treated · cadence: rows appear when notifiers file in NY-Alert; observed DEC view time equals NY-Alert 'Issued' time within seconds (some notifiers' Issued is 1 h behind during DST). Legal deadline: public within 4 h of discovery. · licence: No licence statement on the page; DEC site 'Website and Usage Policies' apply (not quoted; https://dec.ny.gov/about/website-usage-and-policies). Data caveats on page: 'Data quality is not checked by DEC.' · NYS Department of Environmental Conservation
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events · state · csv · cso, sso, bypass · cadence: Batch export, tabs added irregularly (tab names: 'Apr23-Mar24', 'Aug 1- March 31 2025', 'September 2025', 'October 2025', 'December 2025' (holds Nov 2025; December 2025 has 3 rows), 'January 2026-August2026'). Lag 1-2 months at best; gaps. · licence: No licence stated. NY-Alert notifier terms (Wayback copy of sprtknotifierterms.pdf, 2025-11-14): 'All data provided remains under the ownership of DEC, which has the right to remove, add, delete, and view the data stored on the NY-ALERT databases.' · NYS DEC
- ECHO Effluent Charts REST services (per-permit DMR data incl. monthly CSO event counts, duration, volume per outfall)feed: echo-cso-dmr-monthly
monitoring · federal · api · cso · cadence: Monthly DMR due the 15th of the following month; Holyoke Sept 2026 values received 15-Oct-26; ECHO refreshes weekly. Latency 2–7 weeks after the activity. · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data · US EPA OECA (ICIS-NPDES DMRs)
- ECHO NPDES Sewer Overflow and Bypass Event Dataset (eRule Phase 2, current versions)feed: echo-sewer-overflow
events · federal · csv · sso, cso, bypass · cadence: "The data are refreshed daily." Lag from event start to received date in NE: median 2–3 days, 90th percentile 6–7 days (NH, MA), 38 days (RI). Legal basis is the 24-hour oral / 5-day written noncompliance report, not public notice. · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data · US EPA OECA (ICIS-NPDES)
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events · federal · csv · sso, cso, bypass · cadence: Daily · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data · US EPA OECA
- EPA 'Submitting Data to EPA' (eBeaches: WQX monitoring, PRAWN notification, verification tool)not polled
advisories · federal · html · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html · US EPA Office of Water
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outfalls · federal · html · cso · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html · US EPA Office of Wastewater Management
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advisories · federal · pdf · licence: public domain (U.S. federal government work); no licence line on page · U.S. Environmental Protection Agency
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outfalls · federal · csv · cso · cadence: Updated weekly from ICIS-NPDES ("These data are updated weekly by EPA Regions and states"). Not an event feed. · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data · US EPA Office of Enforcement and Compliance Assurance (ECHO) / Office of Wastewater Management
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outfalls · federal · arcgis · cso · cadence: Weekly, same as the CSV (dataLastEditDate 2026-10-26) · licence: EPA Standard Open Data License: "Unless otherwise specified, all data produced by the U.S EPA is by default in the public domain and is not subject to domestic copyright protection under 17 U.S.C. § 105." https://edg.epa.gov/EPA_Data_License.html ECHO swagger 'license': 'U.S. Public Domain License'. ECHO About the Data: "The information contained in ECHO is made available to the public" with no warranty of "accuracy, completeness, or currency"; "ECHO is not designed for large scale data transfers or robotic queries." https://echo.epa.gov/resources/echo-data/about-the-data Item licenseInfo empty; accessInformation 'US EPA'. · US EPA OECA (ArcGIS Online owner OECA_EPA)
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outfalls · nonprofit · api · cadence: snapshot; vintage not stated · licence: Not stated on collection; EPA source data public domain · Internet of Water Coalition / geoconnex, from EPA data
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events · utility · arcgis · cso · cadence: Page: 'updated every 10 minutes'. DateTime is the feed generation time, identical on every row. · licence: Web map item links King County GIS terms (https://kingcounty.gov/en/dept/kcit/data-information-services/gis-center/about/terms-conditions-copyrights); not read · King County Wastewater Treatment Division and Seattle Public Utilities
- Michigan EGLE MiEnviro Portal public CSO/SSO/RTB discharge list (JSON behind the search page)not polled
events · state · api · cso, sso, rtb · cadence: As filed by permittees; Michigan rule requires notice within 24 hours (not quoted here, state law outside this area). Sample: event 2026-10-01 23:20, report received 2026-10-02 00:40. · licence: none stated · Michigan Department of Environment, Great Lakes, and Energy
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events · state · email · cso, sso, bypass, partially_treated · cadence: push, as filed; law: 'as soon as possible but no later than four hours' after discovery to the public · licence: NY-Alert website disclaimer only; no data licence · NYS Division of Homeland Security and Emergency Services (NY-Alert platform, Everbridge back end); alerts authored by municipal notifiers
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advisories · municipal · arcgis · cso · cadence: edited hourly by the model · licence: none stated · NYC DEP
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advisories · municipal · api · cso · cadence: hourly model run from WRRF rain gauges; rainfall sample for 16:00 created 22:58Z (about 1-2 h lag) on 2026-11-01 · licence: No licence stated on the app. NYC Terms of Use apply to nyc.gov content (not quoted). · NYC Department of Environmental Protection
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monitoring · municipal · api · beach_closure · cadence: 'Between May and September of each year, the data is published weekly while NYC beaches are open' · licence: none stated (NYC Open Data terms) · NYC Department of Health and Mental Hygiene
-
monitoring · municipal · api · cadence: 'Update Frequency: Monthly' (latest sample 2025-12-16 on 2026-11-01, so lagging) · licence: none stated · NYC DEP
-
events · municipal · html · cso · licence: none stated · NYC DEP
- NYS Parks 'Water Quality - Beach Results' page and live Beach Status layer (2025_Beach_Status_view)not polled
advisories · state · arcgis · beach_closure · cadence: in season: sampled at least weekly; page says results available about 24 h after sampling and 'the public notified 18-24 hours after an elevated concentration of bacteria occurs'; closures may be preemptive for rainfall ('Predicted exceedance: Rainfall') · licence: none stated · NYS OPRHP
- NYSDEC Combined Sewer Overflow pagenot polled
advisories · state · html · licence: none stated · New York State Department of Environmental Conservation
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monitoring · state · api · beach_closure · cadence: 'Posting Frequency: Annually' (after season) · licence: license: None on the dataset; Open Data NY terms apply. · NYS Office of Parks, Recreation and Historic Preservation
- Open Data NY 'Combined Sewer Overflows (CSOs): Beginning 2013' (ephi-ffu6) and map view i8hd-rmbinot polled
outfalls · state · api · cso · cadence: Posting Frequency 'As needed'; rowsUpdatedAt 2020-11-11; every row data_as_of 2015 · licence: No licence field (license: None). Disclaimer quoted: 'The accuracy of the CSO outfall locations and data is based on the information provided by the permitted facilities... The user must be aware of data conditions and bear responsibility for the appropriate use of the information...' Open Data NY terms of use apply (https://data.ny.gov/download/77gx-ii52/application/pdf, not fetched). · NYS DEC Division of Water, Bureau of Water Compliance
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monitoring · nonprofit · html · licence: none stated · Riverkeeper
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monitoring · nonprofit · api · sample · cadence: Chapter dependent (weekly to monthly). Latest 2026 collection 2026-10-31, latest publication 2026-11-01T18:26Z. Lag can be long: one RI sample collected 2025-12-21 was published 2026-02-23. · licence: none found on portal (not checked beyond the app) · Surfrider Foundation (chapter labs)
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monitoring · federal · api · licence: as WQP · USGS / US EPA / NWQMC