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Connecticut / Sewer operators /

Ansonia

Sewer utility · Connecticut

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

No outlet locations are in our records for this operator.

Federal wastewater discharge permit (NPDES)
not recorded
Wastewater outlets
None with locations in our records
Waters listed as receiving wastewater
not recorded
Tracked waters
Twomile Brook, CT, Naugatuck River, CT
Discharge records counted
51 records · latest
Total reported volume in these records
197,100 gallons across the 22 records that give a volume (29 without one)

These totals reflect the records we track. Missing volumes and gaps in reporting limit comparisons between operators.

Sources: EPA ECHO and the operator and state sources linked below. Counts use the discharge records on this page. Updated 2026-11-03 11:12 UTC.

Public notices and alerts

We do not list an alert service for this operator yet. Check its website.

Source: Ansonia's public notice and alert pages and the state's notification records.

Report a missing notice or error

Wastewater outlets

Outfall: a pipe or outlet where wastewater enters a water body.

Reports and advisories

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Reports linked to Ansonia, newest first
WhenReportStatus
to 6:30 AMWater not mapped · Pump Station, 20 Fitzpatrick Rd, Ansonia, CT · SSO (earlier version) · 40,000 gallons in all ended
to Jun 9 ’25, 12:00 AMWater not mapped · Pump Station, 20 Fitzpatrick Rd, Ansonia, CT · SSO (earlier version) · 20,000 gallons in all ended
to Jun 1 ’25, 12:30 AMTwomile Brook · Pump Station, 17 Glen Dr, Ansonia, CT · SSO (earlier version) · 2,000 gallons in all mapended
to 11:00 PMTwomile Brook · Pump Station, 17 Glen Dr, Ansonia, CT · SSO · 10,000 gallons report · notice · mapended
to Dec 20 ’23, 9:00 AMWater not mapped · Pump Station, 19 Glen Dr, Ansonia, CT · SSO · 96,000 gallons report · noticeended
to Aug 24 ’23, 4:30 PMTwomile Brook · Pump Station, 19 Glen Dr, Ansonia, CT · SSO · 60,000 gallons report · notice · mapended
to Dec 2 ’21, 10:30 AM“Mechanical byass for repairs” · Pump Station, Glen Drive · SSO · volume in each report ended
to 9:11 AMWater not mapped · Sewer Main, Coe Lane Ansonia, CT. 06401 · SSO · “50,001 - 100,000 gallons” report · notice · mapended
to 2:30 PM“Mechanical byass for repairs” · Sewer Main, Coe lane Ansonia, CT. 06401 · SSO · volume in each report ended
to Jun 8 ’21, 9:00 AMWater not mapped · Sewer Main, Wakelee Ave Ansonia CT. 06401 · SSO · volume in each report ended
to Mar 1 ’21, 1:01 PMNaugatuck River · Sewer Main, Liberty St. · SSO · “1 - 50” report · notice · mapended
to 1:30 PMWater not mapped · Sewer Main, liberty Street · SSO · volume in each report ended
to Aug 8 ’20, 9:00 PMWater not mapped · Pump Station, Reichelt terrace · SSO · 0 gallons report · notice · mapended
Water not mapped · Pump Station, Hotchkiss terrace · SSO · 0 gallons report · notice · mapreported
to 1:00 PMWater not mapped · Sewer Main, 267 Wakelee Ave. Ansonia, CT. 06401 · SSO · “1 - 50” report · notice · mapended
to Aug 30 ’19, 11:14 AMWater not mapped · Pump Station, White Oak road · SSO · 0 gallons in all mapended

Sources: CT DEEP Sewage Right-to-Know annual report 2024, retrieved 2026-11-03 11:02 UTC; CT DEEP CSO/SSO Performance Dashboard (QScend), retrieved 2026-11-02 11:20 UTC; CT DEEP reporting archive 2016-2021, retrieved 2026-11-03 11:03 UTC. A report's record id and times show when you hover or focus its "report" link.

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Showing the latest 26 records of 54 records.See them all with filters.

All reports in Connecticut by year: 2025 (7 from Ansonia) · 2023 (2 from Ansonia) · 2021 (12 from Ansonia) · 2020 (3 from Ansonia) · 2019 (10 from Ansonia) · 2018 (10 from Ansonia) · 2017 (10 from Ansonia)

Other sewer operators on these waters

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Grey: no current status on the water outline. Purple hatching: source update overdue.

No discharge, advisory or caution periods are shown for the waters this sewer operator's reports were placed on in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-03 11:12 UTC.

Reported discharges over time

  • Discharges reported by Ansonia, last 12 months0December 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once.
  • Days with a discharge reported by Ansonia, last 12 months0December 2025 to November 2026A day counts once however many discharges were under way on it. Verified reports where available, else notices; revisions and duplicates counted once.
  • Hours with a discharge or advisory status from Ansonia's reports, last 12 months0December 2025 to November 2026Red hours by the map's rules: each discharge to its reported end plus the state's post-discharge period; overlapping hours count once.
  • 2026 season with a discharge or advisory status (Ansonia)0.0%May to October 2026Share of May 1 to October 31 hours with red status by the map's rules, of the hours a source covered.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Treatment bypass: wastewater skips one or more treatment steps. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater. Outfall: a pipe or outlet where wastewater enters a water body.

Reported discharges per month

6 reported discharges, January 2022 to November 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other

Connecticut dashboard records begin December 2, 2021; annual-report rows that repeat a dashboard record are counted once. Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports. Records cover January 1, 2022 to November 3, 2026.

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Hours with a discharge or advisory status per month

Hours when a water had a discharge or advisory status from this sewer operator's reports, under DirtyWaterWatch rules.

  • Discharge or advisory reported

8 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. 1 discharge reported to last more than 31 days is counted as 31 days. Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only. Connecticut dashboard records begin December 2, 2021; annual-report rows that repeat a dashboard record are counted once. Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026. Connecticut's reporting archive runs from July 4, 2016 to December 2, 2021.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Days with a reported discharge per month

A day counts when any counted discharge was under way on it, from its start to its reported end in Eastern Time; a report with no end counts its start day.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports. Records cover January 1, 2022 to November 3, 2026.

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Reported discharges per year, 2016 to 2026

51 reported discharges, 2016 to 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other
  • Incomplete source coverage

Connecticut dashboard records begin December 2, 2021; annual-report rows that repeat a dashboard record are counted once. Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026. Connecticut's reporting archive runs from July 4, 2016 to December 2, 2021.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Reported volume per year

Gallons (axis: K thousand, M million), summed from the 22 reports that gave a volume as a number (29 did not).

  • Incomplete source coverage

29 of 51 discharge reports gave no volume as a number (27 gave a range); only numbers are summed. Connecticut's 2016 to 2021 archive gives volumes as ranges ("20,001 - 50,000 gallons"); they are not summed.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Hours with a discharge or advisory status per year

Hours with a discharge or advisory status each year under DirtyWaterWatch rules; 2026 to date.

  • Discharge or advisory reported
  • Incomplete source coverage

8 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. 1 discharge reported to last more than 31 days is counted as 31 days. Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Share of the May to October season with a discharge or advisory status

Share of the hours from May 1 to October 31 with a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • Season with incomplete source coverage

Seasons with incomplete source coverage: 2016. The share is of the hours a source covered. 8 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here. 1 discharge reported to last more than 31 days is counted as 31 days. Official beach and cyanobacteria (harmful blue-green algae) advisories are counted on water pages only.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Reported discharges by calendar month, all years

Every counted discharge report, by the calendar month it began.

Months are summed over every year a tracked source covers; the table gives the number of years behind each month.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 10 of 32, all years. Counts depend on reporting coverage and do not measure legal compliance or harm.

Connecticut dashboard records begin December 2, 2021; annual-report rows that repeat a dashboard record are counted once. Connecticut's Sewage Right-to-Know annual reports cover January 1, 2021 to November 3, 2026. Connecticut's reporting archive runs from July 4, 2016 to December 2, 2021.

Sources: Connecticut Department of Energy and Environmental Protection sewage overflow dashboard; Connecticut Sewage Right-to-Know annual reports; Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021. Records cover July 4, 2016 to November 3, 2026.

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How these charts are counted

We count each discharge once. Where a source publishes notices and confirmed reports, we use confirmed reports for an operator's month when available; otherwise we use notices. We combine revisions and exclude duplicate state reports copied by the U.S. Environmental Protection Agency (EPA). Monthly and yearly totals appear separately. Status hours follow this site's rules. Shaded gaps mean missing coverage, not zero discharges.

  • Connecticut Department of Energy and Environmental Protection sewage overflow dashboard: records from December 2, 2021 to the latest update
  • Connecticut Sewage Right-to-Know annual reports: records from January 1, 2021 to the latest update
  • Connecticut Department of Energy and Environmental Protection reporting archive, 2016 to 2021: records from July 4, 2016 to December 2, 2021