New Hampshire / Events /
Combined sewer overflow: City of Nashua Wastewater Department, Aug 3, 2026
Ended (as reported) · City of Nashua Wastewater Department (History of CSO Occurrences PDF)
Source: City of Nashua Wastewater Department (History of CSO Occurrences PDF) via nh-permittees, record nashua:2026-08-03:014, the source gives no report time, retrieved 2026-11-02 11:55 UTC · notice
Colours no water as of Nov 2, 2026, 6:56 AM EST: the windows on the methods page have passed, or the record has no time to count from.
A report is not a test of the water. See how statuses are worked out.
1. The reported outfall
Outfall reported by City of Nashua Wastewater Department (NH0100170 outfall 014): “Bridge St.”. Location: 42.76425, -71.44467, from the state's or EPA's outfall layer.
Source: EPA ECHO outfall inventory matched in data/outfalls-ne.json (match: geometry+name), permit NH0100170 outfall 014.
2. Waters named in the notice
The notice names: “Merrimack River”. We place it on Merrimack River, NH. Matched by the outfall's ID in the outfall registry, which places each outfall on a water.
3. Modeled downstream reach
No modeled reach for this record in this build.
Source: water outlines from OpenBoatLaunch and OpenStreetMap contributors (ODbL); outfalls from EPA ECHO and the state outfall layers; modeled reaches computed by DirtyWaterWatch from USGS NLDI, NHDPlus and the nearest USGS gauge (Jobson 1996); basemap OpenFreeMap and OpenMapTiles.
When: three different times
The time of the event, the time the source reported, published or updated it, and the time we fetched it are kept apart. Times are shown in New England time; the record keeps the original offsets.
- Started
- Ended
- not reported
- Precision
- Known to the day only
- Reported to the source
- not given
- Published
- not given
- Source last updated
- not given
- We fetched it
What and how much
- Type
- Combined sewer overflow
- Status in the record
- Ended (as reported)
- Material
- “combined sewage and stormwater (CSO)”
- Volume
- 10.3 million gal (not stated whether estimated or measured)
- Volume in the source's words
- “10.300 MG”
Advice
The record carries no advice text from City of Nashua Wastewater Department (History of CSO Occurrences PDF).
- Advice window
- not stated in the record; the state's window on the methods page applies
- Basis
- not stated
What it does to the map, over time
- Caution Merrimack River: Discharge record with no status and no reported end, Aug 3, 2026, 12:00 AM EDT to Aug 17, 2026, 12:00 AM EDT
- Unresolved: no end reported Merrimack River: Unresolved: no end reported, Aug 17, 2026, 12:00 AM EDT to Sep 2, 2026, 12:00 AM EDT
- No current report Merrimack River: Unresolved: no end reported (off the map after 30 days), Sep 2, 2026, 12:00 AM EDT to Nov 1, 2026, 12:00 AM EDT
- Caution Merrimack River: Discharge record with no status and no reported end, Aug 3, 2026, 12:00 AM EDT to Aug 17, 2026, 12:00 AM EDT
- Unresolved: no end reported Merrimack River: Unresolved: no end reported, Aug 17, 2026, 12:00 AM EDT to Sep 2, 2026, 12:00 AM EDT
- No current report Merrimack River: Unresolved: no end reported (off the map after 30 days), Sep 2, 2026, 12:00 AM EDT to Nov 1, 2026, 12:00 AM EDT
Source: intervals computed by DirtyWaterWatch (build/status.py) from this record and the rules on the methods page, as of 2026-11-02 11:56 UTC.
Source and revisions
- Source
- nh-permittees
- Record id at the source
- nashua:2026-08-03:014
- Original notice
- https://www.nashuanh.gov/DocumentCenter/View/11049
- Revision of
- none (first record)
- Revised by
- no later revision
Every field of the record
event_id | nh-permittees:nashua:2026-08-03:014 |
|---|---|
source_id | nh-permittees |
source_record_id | nashua:2026-08-03:014 |
parent_event_id | null |
event_type | cso |
status | ended |
discharger_id | nh-nashua-wastewater |
discharger_name | City of Nashua Wastewater Department |
npdes_permit | NH0100170 |
outfall_id | 014 |
outfall_name | Bridge St. |
waterbody_text | Merrimack River |
water_slugs | ["merrimack-river-nh"] |
water_match | outfall_registry |
lat | 42.7642541 |
lon | -71.4446681 |
coord_source | outfall_layer |
coord_precision_m | null |
started_at | 2026-08-03T00:00:00-04:00 |
ended_at | null |
time_precision | day |
reported_at | null |
published_at | null |
source_updated_at | null |
fetched_at | 2026-11-02T11:55:02Z |
material | combined sewage and stormwater (CSO) |
volume_gal | 10300000 |
volume_text | 10.300 MG |
estimate_flag | unknown |
authority | City of Nashua Wastewater Department (History of CSO Occurrences PDF) |
advice_text | null |
advice_window_hours | null |
advice_window_basis | null |
source_url | https://www.nashuanh.gov/DocumentCenter/View/11049 |
parse_error | null |
fixture | false |
reach | NH0100170-014 |
file | events/nh-permittees~3Anashua~3A2026-08-03~3A014.json |
duplicate_of | null |
placement_note | null |
unplaced_reason | null |
set_aside | null |
superseded | null |
reach_band | null |
The source's record (raw)
{
"date": "8/3/2026",
"outfall": "CSO 014",
"total_flow_mg": "10.300",
"duration_min": 190,
"table_year": "2026"
} Source: City of Nashua Wastewater Department (History of CSO Occurrences PDF) via nh-permittees, record nashua:2026-08-03:014, the source gives no report time, retrieved 2026-11-02 11:55 UTC · notice
Personal fields (names, emails, phone numbers of staff) are removed from raw records before they are stored.