City of Norwalk WPCA (Norwalk WPCF) - NPDES permitted secondary-treatment bypass and Ann Street Siphon emergency overflow
BYPASS · Connecticut · Norwalk
- NPDES permit
- CT0101249
- Outfalls
- none with coordinates yet (the state's layer lists 1)
- Receiving waters
- Norwalk River; Norwalk Harbor / Long Island Sound
- Tracked waters
- Norwalk River, CT, Long Island Sound, CT, Saugatuck River, CT, Indian River, CT, Cockenoe Harbor, CT, Ash Creek, CT
- Events tracked
- 333 discharges · latest Sep 13, 2026, 9:30 AM EDT
- Volume reported
- 207,234,195 gallons across the 226 discharges that give a volume (107 without one)
Source: discharger record from the project's research and EPA ECHO (dischargers.json); counts from the 333 event records below, as of 2026-11-02 11:56 UTC.
How it tells the public
CT DEEP Performance Dashboard (QScend QAlert reports shown in Zoho Analytics open views: https://deepct.qscend.mygovcenter.com/cms/cms?id=1); X/Twitter @CTSewageSpills (manual DEEP posts). Statutory local notice: operator must notify the chief elected official and local health official within 2 h; they must inform the public within 2 h of receipt (CGS 22a-424a(c)(3)) - channel varies by town. norwalkwpca.org: no event notices found. Emergency 203-943-0222.
Source: the project's research on each operator's notification channel (research/<state>/dischargers.json), checked by fetching the operator's pages.
Outfalls
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.
Event history
| Start | End | Water | Outfall | Type | Volume | Source | Links |
|---|---|---|---|---|---|---|---|
| Sep 13, 2026, 9:30 AM EDT | Sep 13, 2026, 11:30 AM EDT | Norwalk River, CT | Pump Station, 95 N Water St, Norwalk, CT | Sanitary sewer overflow | “Unable to determine due to tidal impact of receiving waters” | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 11432, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | Event: Sanitary sewer overflow, Norwalk WPCA, Sep 13, 2026, 9:30 AM EDT · Map |
| Sep 13, 2026, 8:30 AM EDT | Sep 13, 2026, 11:30 PM EDT | Norwalk River, CT | Manhole, 60 S Smith St, Norwalk, CT | Sanitary sewer overflow | “Unknown. Please see attached memo with additional information.” | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 11476, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | Event: Sanitary sewer overflow, Norwalk WPCA, Sep 13, 2026, 8:30 AM EDT · Map |
| Sep 13, 2026, 8:30 AM EDT | Sep 13, 2026, 11:30 PM EDT | not placed | not stated | Treatment plant bypass | 14.08 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 11430, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | Event: Treatment plant bypass, Norwalk WPCA, Sep 13, 2026, 8:30 AM EDT |
| Jul 21, 2026, 1:15 PM EDT | Jul 21, 2026, 7:00 PM EDT | not placed | not stated | Treatment plant bypass | 2.93 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 11015, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | Event: Treatment plant bypass, Norwalk WPCA, Jul 21, 2026, 1:15 PM EDT |
| Mar 10, 2026, 1:15 PM EDT | Mar 10, 2026, 1:45 PM EDT | “Stormwater System” (not placed) | Manhole, 330 Ely Ave, Norwalk, CT | Sanitary sewer overflow | 100 gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 10384, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 15, 2026, 10:30 AM EST | Jan 15, 2026, 10:45 AM EST | Norwalk River, CT | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 100 gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 10267, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 31, 2025, 9:15 AM EDT | Oct 31, 2025, 10:00 AM EDT | Norwalk River, CT | Manhole, 12 Lexington Ave, Norwalk, CT | Sanitary sewer overflowrevised | 185 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 10091-2, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 31, 2025, 9:15 AM EDT | Oct 31, 2025, 10:00 AM EDT | Norwalk River, CT | Manhole, 12 Lexington Ave, Norwalk, CT | Sanitary sewer overflowrevised | 185 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 10091, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 31, 2025, 9:15 AM EDT | Oct 31, 2025, 10:00 AM EDT | Norwalk River, CT | Manhole, 12 Lexington Ave, Norwalk, CT | Sanitary sewer overflow | 185 gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 10091, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 23, 2025, 7:30 AM EDT | Jul 24, 2025, 12:00 PM EDT | Norwalk River, CT | Sewer Main, 6 Gordon St, Norwalk, CT | Sanitary sewer overflowrevised | 870 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9744-2, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 23, 2025, 7:30 AM EDT | Jul 24, 2025, 12:00 PM EDT | Norwalk River, CT | Sewer Main, 6 Gordon St, Norwalk, CT | Sanitary sewer overflowrevised | 870 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9744, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 23, 2025, 7:30 AM EDT | Jul 24, 2025, 12:00 PM EDT | Norwalk River, CT | Sewer Main, 6 Gordon St, Norwalk, CT | Sanitary sewer overflow | 870 gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 9744, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 11, 2025, 7:00 AM EDT | Jul 11, 2025, 1:45 PM EDT | Norwalk River, CT | Sewer Main, 8 W Rocks Rd, Norwalk, CT | Sanitary sewer overflowrevised | 101 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9709-2, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 11, 2025, 7:00 AM EDT | Jul 11, 2025, 1:45 PM EDT | Norwalk River, CT | Sewer Main, 8 W Rocks Rd, Norwalk, CT | Sanitary sewer overflowrevised | 101 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9709, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 11, 2025, 7:00 AM EDT | Jul 11, 2025, 1:45 PM EDT | Norwalk River, CT | Sewer Main, 8 W Rocks Rd, Norwalk, CT | Sanitary sewer overflow | 101 gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 9709, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Feb 16, 2025, 9:00 AM EST | Feb 16, 2025, 10:15 AM EST | “Keeler Brook” (not placed) | Pump Station, 467 Connecticut Ave, Norwalk, CT | Sanitary sewer overflow | 48,800 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9104-2, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Feb 16, 2025, 9:00 AM EST | Feb 16, 2025, 10:15 AM EST | “Keeler Brook” (not placed) | Pump Station, 467 Connecticut Ave, Norwalk, CT | Sanitary sewer overflow | 48,800 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9104, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Feb 14, 2025, 12:00 PM EST | Feb 14, 2025, 12:15 PM EST | not placed | Basement, 12 Bouton St, Norwalk, CT | Sanitary sewer overflow | 200 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9095-2, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Feb 14, 2025, 12:00 PM EST | Feb 14, 2025, 12:15 PM EST | not placed | Basement, 12 Bouton St, Norwalk, CT | Sanitary sewer overflow | 200 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9095, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 15, 2025, 7:00 AM EST | Jan 15, 2025, 7:30 AM EST | “Betts Brook” (not placed) | Sewer Main, Park, Norwalk, CT | Sanitary sewer overflow | 110 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9029-2, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 15, 2025, 7:00 AM EST | Jan 15, 2025, 7:30 AM EST | “Betts Brook” (not placed) | Sewer Main, Park, Norwalk, CT | Sanitary sewer overflow | 110 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2026) via ct-deep-annual, record 9029, published Feb 25, 2026, 4:08 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 20, 2024, 7:15 AM EST | Dec 20, 2024, 11:15 AM EST | not placed | Sewer Main, 60 Howard Ave, Norwalk, CT | Sanitary sewer overflow | 90 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record xdd124f051510, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 18, 2024, 9:30 AM EDT | Aug 18, 2024, 6:45 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 9.1 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x7b792fb3384e, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 18, 2024, 9:30 AM EDT | Aug 18, 2024, 6:45 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 9.1 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 8548, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 18, 2024, 5:45 AM EDT | Aug 19, 2024, 3:15 AM EDT | “Keeler Brook” (not placed) | Pump Station, 473 Connecticut Ave, Norwalk, CT | Sanitary sewer overflow | 1.7 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x8870977e555d, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 7, 2024, 7:15 AM EDT | Aug 7, 2024, 8:00 AM EDT | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 250 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x6327adf3ef79, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 17, 2024, 7:15 PM EDT | Jul 18, 2024, 12:00 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 2.58 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record xe52ceaa315f8, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 17, 2024, 7:15 PM EDT | Jul 18, 2024, 12:00 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 2.58 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 9034, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 12, 2024, 4:30 PM EDT | Jul 13, 2024, 2:30 AM EDT | Saugatuck River, CT | Sewer Main, 56 County St, Norwalk, CT | Sanitary sewer overflow | 800 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x1655afbb1c6c, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Apr 28, 2024, 5:30 PM EDT | Apr 28, 2024, 7:30 PM EDT | Indian River, CT | Pump Station, 11 Leann Dr, Norwalk, CT | Sanitary sewer overflow | 34,362 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x8eac82ced8f2, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Apr 3, 2024, 8:45 PM EDT | Apr 5, 2024, 1:00 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 2.21 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x9ffc78a448a9, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 23, 2024, 4:15 PM EDT | Mar 24, 2024, 12:15 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 5.14 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record xf5692ec130ac, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 23, 2024, 4:15 PM EDT | Mar 24, 2024, 12:15 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 5.14 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 5702, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 22, 2024, 11:00 AM EDT | Mar 22, 2024, 4:00 PM EDT | not placed | Sewer Main, 33 S Beach Dr, Norwalk, CT | Sanitary sewer overflow | 800 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x9b511208c93f, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 9, 2024, 10:15 PM EST | Mar 10, 2024, 10:30 PM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 5.14 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record xa9e12514dc3b, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 9, 2024, 10:15 PM EST | Mar 10, 2024, 10:30 PM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 5.14 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 5595, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 7, 2024, 6:30 AM EST | Mar 7, 2024, 6:30 AM EST | “Wilson Cove” (not placed) | Pump Station, Old Trolley Way, Norwalk, CT | Sanitary sewer overflow | 2,500 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x33ea822d0a3d, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 6, 2024, 9:15 PM EST | Mar 7, 2024, 1:00 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 4.27 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record xc3665680cbba, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 6, 2024, 9:15 PM EST | Mar 7, 2024, 1:00 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 4.27 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 5541, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 6, 2024, 11:45 AM EST | Mar 6, 2024, 11:45 AM EST | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 450 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x61a8ad25f444, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 15, 2024, 7:00 AM EST | Jan 15, 2024, 8:30 AM EST | “Keeler Brook” (not placed) | Pump Station, 473 Connecticut Ave, Norwalk, CT | Sanitary sewer overflow | 450 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x6ed0012fc171, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 13, 2024, 5:45 AM EST | Jan 13, 2024, 4:30 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 7.09 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record xbc34d4323b0f, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 13, 2024, 5:45 AM EST | Jan 13, 2024, 4:30 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 7.09 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 5251, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 11, 2024, 1:00 PM EST | Jan 11, 2024, 1:30 PM EST | not placed | Manhole, 60 Connecticut Ave, Norwalk, CT | Sanitary sewer overflow | 80 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x905dd28ad0c8, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 9, 2024, 10:30 PM EST | Jan 10, 2024, 1:15 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 4.27 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2025) via ct-deep-annual, record x7711b0547625, published Mar 31, 2025, 1:52 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 9, 2024, 10:30 PM EST | Jan 10, 2024, 1:15 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 4.27 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 5135, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 28, 2023, 1:00 PM EST | Dec 28, 2023, 12:15 PM EST | not placed | Sewer Main, 29 Willow St, Norwalk, CT | Sanitary sewer overflow | 450 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x1fd0523d4ede, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 28, 2023, 7:30 AM EST | Dec 28, 2023, 2:45 PM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 1.79 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xf7cdd3bcda9a, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 29, 2023, 1:00 PM EDT | Sep 29, 2023, 3:00 PM EDT | Norwalk River, CT | Manhole, 3 Armstrong Ct, Norwalk, CT | Sanitary sewer overflow | 3,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xb5111c1cfd26, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 29, 2023, 12:15 PM EDT | Sep 29, 2023, 12:30 PM EDT | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 75 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x800a133939a0, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 29, 2023, 12:00 AM EDT | Sep 30, 2023, 12:00 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 11.42 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xaea24e37f6cf, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 10, 2023, 1:00 PM EDT | Sep 10, 2023, 2:15 PM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 56,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xef57f9d9e5ce, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 28, 2023, 8:00 AM EDT | Aug 28, 2023, 8:30 AM EDT | not placed | Manhole, 27 Priscilla Rd, Norwalk, CT | Sanitary sewer overflow | 75 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x463218434603, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 18, 2023, 7:15 AM EDT | Aug 18, 2023, 8:00 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 100,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xd0e57a1ea6d0, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 1, 2023, 10:15 AM EDT | Aug 1, 2023, 11:15 AM EDT | not placed | Sewer Main, 25 New Canaan Ave, Norwalk, CT | Sanitary sewer overflow | 30 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x8679ef620ccc, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 29, 2023, 12:00 PM EDT | Jul 29, 2023, 12:30 PM EDT | not placed | Manhole, 474 Main Ave, Norwalk, CT | Sanitary sewer overflow | 75 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x06d9cd6ab48f, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 14, 2023, 10:00 AM EDT | Jul 14, 2023, 10:15 AM EDT | not placed | Treatment Plant, 15 S Smith St, Norwalk, CT | Treatment plant bypass | 75 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xffdba452d471, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| May 20, 2023, 7:00 PM EDT | May 20, 2023, 7:45 PM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 20,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xfe90e350c9c2, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| May 8, 2023, 11:00 AM EDT | May 8, 2023, 11:15 AM EDT | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 1,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xc8c03cda8fa7, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Apr 30, 2023, 11:30 PM EDT | Apr 30, 2023, 12:30 AM EDT | Norwalk River, CT | 002-1 | Treatment plant bypass | 60,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x5826636fbe2e, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 11, 2023, 11:15 AM EST | Mar 13, 2023, 11:30 AM EDT | not placed | Manhole, 155 W Cedar St, Norwalk, CT | Sanitary sewer overflow | 30 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xcb6e0b9cf939, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Feb 1, 2023, 12:00 PM EST | Feb 1, 2023, 12:15 PM EST | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 5,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x653ac267572a, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 29, 2023, 1:30 PM EST | Jan 29, 2023, 1:45 PM EST | not placed | Manhole, 27 Ivy Pl, Norwalk, CT | Sanitary sewer overflow | 30 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record xaa20edc68655, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 26, 2023, 11:45 PM EST | Jan 26, 2023, 2:15 AM EST | Norwalk River, CT | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 5,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x6b834540b2a0, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 25, 2023, 11:45 PM EST | Jan 26, 2023, 2:15 AM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 950,000 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2024) via ct-deep-annual, record x3c2eb8071090, published Jan 9, 2025, 2:55 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 25, 2023, 11:45 PM EST | Jan 26, 2023, 2:15 AM EST | Norwalk River, CT | 002-1 | Treatment plant bypass | 65 million gal | Norwalk WPCA (CT DEEP Performance Dashboard) via CT DEEP CSO/SSO Performance Dashboard (QScend), record 2037, the source gives no report time, retrieved 2026-11-02 11:20 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 28, 2022, 3:15 PM EST | Nov 28, 2022, 12:00 PM EST | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | 20 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xf5b6060ea63f, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 17, 2022, 12:00 PM EDT | Oct 17, 2022, 12:30 PM EDT | not placed | Manhole, 6 Newfield St, Norwalk, CT | Sanitary sewer overflow | 10 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x4296d3a8b696, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 27, 2022, 5:15 PM EDT | ended, time not reported | “This spill reached a catch basin but the basin was dry and no flow left the basin to a waterway.” (not placed) | Manhole, 250 Westport Ave, Norwalk, CT | Sanitary sewer overflow | “Under 100 gallons” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x6f0eb9094a4e, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 26, 2022, 8:00 PM EDT | Aug 26, 2022, 9:00 PM EDT | not placed | 219 East Ave, Norwalk, CT | Sanitary sewer overflow | 1 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x973ee2d0551f, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Aug 10, 2022, 9:00 AM EDT | Aug 10, 2022, 11:00 AM EDT | not placed | Manhole, 13 Branford St, Norwalk, CT | Sanitary sewer overflow | “Under 100 gallons” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x55707c6c8e2e, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jul 16, 2022, 1:30 PM EDT | Jul 16, 2022, 1:30 PM EDT | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | “Under 500 gallons” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xb7292b66b0b8, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 28, 2022, 2:15 PM EDT | Jun 28, 2022, 5:00 PM EDT | not placed | Lateral - Private, 25 Soundview Ave, Norwalk, CT | Sanitary sewer overflow | “Under 500 gallons, contained to the yard and driveway area of homeowner” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x6fa5b94968f8, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 18, 2022, 8:45 PM EDT | Jun 19, 2022, 4:00 PM EDT | not placed | Lateral - Private, 24 Avenue D, Norwalk, CT | Sanitary sewer overflow | 1 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x28dbd101df82, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jun 15, 2022, 1:30 PM EDT | Jun 15, 2022, 3:30 PM EDT | Long Island Sound, CT | Sewer Main, 257 Strawberry Hill Ave, Norwalk, CT | Sanitary sewer overflow | “The release lasted two hours and eleven minutes with an approximate discharge of 100 gallons perminu” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x2da3040ca892, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Apr 12, 2022, 4:30 PM EDT | Apr 12, 2022, 4:45 PM EDT | “Unknown/No named water course in the area” (not placed) | Manhole, #5 Blue Mountain Rd, Norwalk, CT | Sanitary sewer overflow | 20 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x64447ad31d36, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Apr 3, 2022, 11:00 AM EDT | Apr 3, 2022, 11:00 AM EDT | not placed | Treatment Plant, 60 S Smith St, Norwalk, CT | Treatment plant bypass | “Less than 500 gallons” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x2855318aa260, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 30, 2022, 12:30 PM EDT | Mar 30, 2022, 12:45 PM EDT | not placed | Pump Station, 38 S Beach Dr, Norwalk, CT | Sanitary sewer overflow | 10 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xb1a6993e243c, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 23, 2022, 7:00 PM EDT | Mar 23, 2022, 8:00 PM EDT | not placed | Lateral - Private, 15 Catherine St, Norwalk, CT | Sanitary sewer overflow | 3 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xcef058ae4fdb, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 16, 2022, 12:45 PM EDT | Mar 16, 2022, 2:30 PM EDT | not placed | Lateral - Private, 540 Main Ave, Norwalk, CT | Sanitary sewer overflow | 50 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x08975c2a946c, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 15, 2022, 11:45 AM EDT | Mar 15, 2022, 2:00 PM EDT | not placed | Lateral - Private, 52 Hill St, Norwalk, CT | Sanitary sewer overflow | not reported | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xd456f3639659, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 10, 2022, 11:00 AM EST | Mar 10, 2022, 11:30 AM EST | not placed | Lateral - Private, 2 Reboda Ct, Norwalk, CT | Sanitary sewer overflow | “Unknow, Happened inside owners dwelling” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xd28e33cff378, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Mar 8, 2022, 12:15 PM EST | Mar 8, 2022, 12:15 PM EST | “Indinan Creek off strawberry hill ave.” (not placed) | Lateral - Private, 243 Strawberry Hill Ave, Norwalk, CT | Sanitary sewer overflow | “Private Line” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record xde6c60919cb2, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Feb 24, 2022, 12:45 PM EST | Feb 24, 2022, 1:30 PM EST | not placed | Manhole, 404 Westport Ave, Norwalk, CT | Sanitary sewer overflow | “Less than 100 gallons” | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x307889718387, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Jan 24, 2022, 12:30 PM EST | Jan 24, 2022, 1:00 PM EST | not placed | Manhole, 30 Douglas Dr, Norwalk, CT | Sanitary sewer overflow | 10 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2023) via ct-deep-annual, record x9ce9271d279a, published Jan 9, 2025, 2:54 PM EST, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Dec 20, 2021, 8:30 AM EST | Dec 20, 2021, 8:45 PM EST | not placed | Basement, 21 Poplar St, Norwalk, CT | Sanitary sewer overflow | 30 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2022) via ct-deep-annual, record xa41356d94996, published Oct 9, 2024, 12:47 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 30, 2021, 11:38 AM EST | Dec 1, 2021, 12:00 PM EST | “Keeler Brook North of I-95” (not placed) | Manhole, 365 Westport Ave | Sanitary sewer overflow | 800 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2022) via ct-deep-annual, record x52c1f3598910, published Oct 9, 2024, 12:47 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Nov 30, 2021, 11:38 AM EST | not reported | “Keeler Brook North of I-95” (not placed) | Manhole, 365 Westport Ave | Sanitary sewer overflow | “501 - 1,000 gallons” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35964302, reported Nov 30, 2021, 11:47 AM EST, retrieved 2026-11-02 11:54 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 26, 2021, 9:40 AM EDT | Oct 26, 2021, 11:45 PM EDT | Norwalk River, CT | Treatment Plant, 60 South Smith Street | Treatment plant bypass | 1 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2022) via ct-deep-annual, record x73bae64de74a, published Oct 9, 2024, 12:47 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 26, 2021, 9:40 AM EDT | Oct 26, 2021, 11:45 PM EDT | Norwalk River, CT | Treatment Plant, 60 South Smith Street | Treatment plant bypass | “Over 1,000,000 gallons” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35963254, reported Oct 26, 2021, 2:43 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 26, 2021, 9:40 AM EDT | Oct 26, 2021, 11:45 PM EDT | Norwalk River, CT | Treatment Plant, 60 South Smith Street | Treatment plant bypass | “Over 1,000,000 gallons” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35963253, reported Oct 26, 2021, 2:43 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 26, 2021, 9:40 AM EDT | not reported | Norwalk River, CT | Treatment Plant, 60 South Smith Street | Treatment plant bypass | “Over 1,000,000 gallons” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35963252, the source gives no report time, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 19, 2021, 11:00 AM EDT | Oct 19, 2021, 11:00 AM EDT | not placed | Basement, 66 Grandview Ave | Sanitary sewer overflow | 25 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2022) via ct-deep-annual, record x0f3d5b13c7e5, published Oct 9, 2024, 12:47 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 19, 2021, 11:00 AM EDT | Oct 19, 2021, 11:00 AM EDT | Norwalk River, CT | Basement, 66 Grandview Ave | Sanitary sewer overflow | “Undetermined” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35965018, reported Oct 19, 2021, 11:27 AM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 19, 2021, 11:00 AM EDT | Oct 19, 2021, 11:00 AM EDT | Norwalk River, CT | Basement, 66 Grandview Ave | Sanitary sewer overflow | “Undetermined” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35965017, reported Oct 19, 2021, 11:27 AM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Oct 19, 2021, 11:00 AM EDT | not reported | Norwalk River, CT | Basement, 66 Grandview Ave | Sanitary sewer overflow | “Undetermined” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35964690, reported Oct 19, 2021, 11:27 AM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 12, 2021, 12:10 PM EDT | Sep 12, 2021, 12:10 PM EDT | “Keeler Brook” (not placed) | Manhole, 360 Connecticut Ave | Sanitary sewer overflow | 300 gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2022) via ct-deep-annual, record x3ee5e4d2a99e, published Oct 9, 2024, 12:47 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 12, 2021, 12:10 PM EDT | not reported | “Keeler Brook” (not placed) | Manhole, 360 Connecticut Ave | Sanitary sewer overflow | “51 - 500 gallons” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35964914, reported Sep 15, 2021, 1:07 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 1, 2021, 9:59 PM EDT | Sep 1, 2021, 9:59 PM EDT | Norwalk River, CT | Treatment Plant, 60 South Smith Street. Norwalk, CT 06855 | Treatment plant bypass | 1 million gal | Norwalk WPCA (CT DEEP Sewage Right-to-Know annual report 2022) via ct-deep-annual, record x37848746d544, published Oct 9, 2024, 12:47 PM EDT, retrieved 2026-11-02 11:53 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
| Sep 1, 2021, 9:59 PM EDT | not reported | Norwalk River, CT | Treatment Plant, 60 South Smith Street. Norwalk, CT 06855 | Treatment plant bypass | “Undetermined” | Norwalk WPCF (CT DEEP reporting archive 2016-2021) via ct-deep-archive, record bypass-35963235, reported Sep 1, 2021, 11:06 PM EDT, retrieved 2026-11-02 11:54 UTC · notice | record below · Map |
Full record (older than 180 days, so no page of its own) | |||||||
Showing the newest 100 events of 339 events. See them all with filters.
History
- Discharge events, last 12 months6Dec 2025 to Nov 2026
- Days with a discharge, last 12 months4Dec 2025 to Nov 2026
- Hours under advisory, last 12 months214Dec 2025 to Nov 2026; on this discharger's reports
- 2026 season under advisory2.6%May to October; 117 h
Discharge events per month
71 events, Jan 2022 to Nov 2026. Counted from 62 verified or annual reports, 9 public notices.
- Combined sewer overflow
- Sanitary sewer overflow
- Bypass, blended or other
CT DEEP dashboard records begin 2021-12-02; where CT DEEP's annual report covers a discharger's month, the annual report is counted instead. CT DEEP annual reports (Sewage Right-to-Know) cover 2021-01-01 to 2026-11-02.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports. Covered 2022-01-01 to 2026-11-02.
Show table
| Month | Combined sewer overflow | Sanitary sewer overflow | Bypass, blended or other | Total | Counted from | Coverage |
|---|---|---|---|---|---|---|
| Jan 2022 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Feb 2022 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Mar 2022 | 0 | 6 | 0 | 6 | Verified or annual reports | |
| Apr 2022 | 0 | 1 | 1 | 2 | Verified or annual reports | |
| May 2022 | 0 | 0 | 0 | 0 | ||
| Jun 2022 | 0 | 3 | 0 | 3 | Verified or annual reports | |
| Jul 2022 | 0 | 0 | 1 | 1 | Verified or annual reports | |
| Aug 2022 | 0 | 2 | 0 | 2 | Verified or annual reports | |
| Sep 2022 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Oct 2022 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Nov 2022 | 0 | 0 | 1 | 1 | Verified or annual reports | |
| Dec 2022 | 0 | 0 | 0 | 0 | ||
| Jan 2023 | 0 | 1 | 2 | 3 | Verified or annual reports | |
| Feb 2023 | 0 | 0 | 1 | 1 | Verified or annual reports | |
| Mar 2023 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Apr 2023 | 0 | 0 | 1 | 1 | Verified or annual reports | |
| May 2023 | 0 | 0 | 2 | 2 | Verified or annual reports | |
| Jun 2023 | 0 | 0 | 0 | 0 | ||
| Jul 2023 | 0 | 1 | 1 | 2 | Verified or annual reports | |
| Aug 2023 | 0 | 2 | 1 | 3 | Verified or annual reports | |
| Sep 2023 | 0 | 1 | 3 | 4 | Verified or annual reports | |
| Oct 2023 | 0 | 0 | 0 | 0 | ||
| Nov 2023 | 0 | 0 | 0 | 0 | ||
| Dec 2023 | 0 | 1 | 1 | 2 | Verified or annual reports | |
| Jan 2024 | 0 | 2 | 2 | 4 | Verified or annual reports | |
| Feb 2024 | 0 | 0 | 0 | 0 | ||
| Mar 2024 | 0 | 2 | 4 | 6 | Verified or annual reports | |
| Apr 2024 | 0 | 1 | 1 | 2 | Verified or annual reports | |
| May 2024 | 0 | 0 | 0 | 0 | ||
| Jun 2024 | 0 | 0 | 0 | 0 | ||
| Jul 2024 | 0 | 1 | 1 | 2 | Verified or annual reports | |
| Aug 2024 | 0 | 1 | 2 | 3 | Verified or annual reports | |
| Sep 2024 | 0 | 0 | 0 | 0 | ||
| Oct 2024 | 0 | 0 | 0 | 0 | ||
| Nov 2024 | 0 | 0 | 0 | 0 | ||
| Dec 2024 | 0 | 1 | 0 | 1 | Verified or annual reports | |
| Jan 2025 | 0 | 2 | 0 | 2 | Verified or annual reports | |
| Feb 2025 | 0 | 4 | 0 | 4 | Verified or annual reports | |
| Mar 2025 | 0 | 0 | 0 | 0 | ||
| Apr 2025 | 0 | 0 | 0 | 0 | ||
| May 2025 | 0 | 0 | 0 | 0 | ||
| Jun 2025 | 0 | 0 | 0 | 0 | ||
| Jul 2025 | 0 | 2 | 0 | 2 | Public notices (no report yet) | |
| Aug 2025 | 0 | 0 | 0 | 0 | ||
| Sep 2025 | 0 | 0 | 0 | 0 | ||
| Oct 2025 | 0 | 1 | 0 | 1 | Public notices (no report yet) | |
| Nov 2025 | 0 | 0 | 0 | 0 | ||
| Dec 2025 | 0 | 0 | 0 | 0 | ||
| Jan 2026 | 0 | 0 | 1 | 1 | Public notices (no report yet) | |
| Feb 2026 | 0 | 0 | 0 | 0 | ||
| Mar 2026 | 0 | 1 | 0 | 1 | Public notices (no report yet) | |
| Apr 2026 | 0 | 0 | 0 | 0 | ||
| May 2026 | 0 | 0 | 0 | 0 | ||
| Jun 2026 | 0 | 0 | 0 | 0 | ||
| Jul 2026 | 0 | 0 | 1 | 1 | Public notices (no report yet) | |
| Aug 2026 | 0 | 0 | 0 | 0 | ||
| Sep 2026 | 0 | 2 | 1 | 3 | Public notices (no report yet) | |
| Oct 2026 | 0 | 0 | 0 | 0 | ||
| Nov 2026 | 0 | 0 | 0 | 0 |
Hours under advisory per month
Hours this discharger's reports put a water under an advisory, by the map's red rules.
- Advisory in effect
62 discharge events have no reported end and no ongoing status; under the status rules they set caution, not an advisory, and add no hours here. 3 events reported to last more than 31 days are counted to 31 days. Official beach and cyanobacteria advisories are counted on water pages only. CT DEEP dashboard records begin 2021-12-02; where CT DEEP's annual report covers a discharger's month, the annual report is counted instead. CT DEEP annual reports (Sewage Right-to-Know) cover 2021-01-01 to 2026-11-02. CT DEEP's reporting archive runs 2016-07-04 to 2021-12-02.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports; CT DEEP reporting archive 2016-2021. Covered 2016-07-04 to 2026-11-02.
Show table
| Month | Hours under advisory | From discharge windows | Hours in month | Coverage |
|---|---|---|---|---|
| Jan 2022 | 49 | 49 | 744 | |
| Feb 2022 | 49 | 49 | 672 | |
| Mar 2022 | 255 | 255 | 744 | |
| Apr 2022 | 109 | 109 | 720 | |
| May 2022 | 0 | 0 | 744 | |
| Jun 2022 | 168 | 168 | 720 | |
| Jul 2022 | 48 | 48 | 744 | |
| Aug 2022 | 99 | 99 | 744 | |
| Sep 2022 | 0 | 0 | 720 | |
| Oct 2022 | 49 | 49 | 744 | |
| Nov 2022 | 0 | 0 | 720 | |
| Dec 2022 | 0 | 0 | 744 | |
| Jan 2023 | 99 | 99 | 744 | |
| Feb 2023 | 48 | 48 | 672 | |
| Mar 2023 | 95 | 95 | 744 | |
| Apr 2023 | 0 | 0 | 720 | |
| May 2023 | 97 | 97 | 744 | |
| Jun 2023 | 0 | 0 | 720 | |
| Jul 2023 | 97 | 97 | 744 | |
| Aug 2023 | 146 | 146 | 744 | |
| Sep 2023 | 97 | 97 | 720 | |
| Oct 2023 | 24 | 24 | 744 | |
| Nov 2023 | 0 | 0 | 720 | |
| Dec 2023 | 55 | 55 | 744 | |
| Jan 2024 | 178 | 178 | 744 | |
| Feb 2024 | 0 | 0 | 696 | |
| Mar 2024 | 230 | 230 | 744 | |
| Apr 2024 | 126 | 126 | 720 | |
| May 2024 | 0 | 0 | 744 | |
| Jun 2024 | 0 | 0 | 720 | |
| Jul 2024 | 111 | 111 | 744 | |
| Aug 2024 | 118 | 118 | 744 | |
| Sep 2024 | 0 | 0 | 720 | |
| Oct 2024 | 0 | 0 | 744 | |
| Nov 2024 | 0 | 0 | 720 | |
| Dec 2024 | 52 | 52 | 744 | |
| Jan 2025 | 49 | 49 | 744 | |
| Feb 2025 | 94 | 94 | 672 | |
| Mar 2025 | 0 | 0 | 744 | |
| Apr 2025 | 0 | 0 | 720 | |
| May 2025 | 0 | 0 | 744 | |
| Jun 2025 | 0 | 0 | 720 | |
| Jul 2025 | 131 | 131 | 744 | |
| Aug 2025 | 0 | 0 | 744 | |
| Sep 2025 | 0 | 0 | 720 | |
| Oct 2025 | 15 | 15 | 744 | |
| Nov 2025 | 34 | 34 | 720 | |
| Dec 2025 | 0 | 0 | 744 | |
| Jan 2026 | 48 | 48 | 744 | |
| Feb 2026 | 0 | 0 | 672 | |
| Mar 2026 | 49 | 49 | 744 | |
| Apr 2026 | 0 | 0 | 720 | |
| May 2026 | 0 | 0 | 744 | |
| Jun 2026 | 0 | 0 | 720 | |
| Jul 2026 | 54 | 54 | 744 | |
| Aug 2026 | 0 | 0 | 744 | |
| Sep 2026 | 63 | 63 | 720 | |
| Oct 2026 | 0 | 0 | 744 | |
| Nov 2026 | 0 | 0 | 32 |
Days with a discharge per month
A day counts when any counted discharge was under way on it (start to reported end, local time); an event with no end counts its start day.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports. Covered 2022-01-01 to 2026-11-02.
Show table
| Month | Days with a discharge | Coverage |
|---|---|---|
| Jan 2022 | 1 | |
| Feb 2022 | 1 | |
| Mar 2022 | 6 | |
| Apr 2022 | 2 | |
| May 2022 | 0 | |
| Jun 2022 | 4 | |
| Jul 2022 | 1 | |
| Aug 2022 | 2 | |
| Sep 2022 | 1 | |
| Oct 2022 | 1 | |
| Nov 2022 | 1 | |
| Dec 2022 | 0 | |
| Jan 2023 | 3 | |
| Feb 2023 | 1 | |
| Mar 2023 | 3 | |
| Apr 2023 | 1 | |
| May 2023 | 2 | |
| Jun 2023 | 0 | |
| Jul 2023 | 2 | |
| Aug 2023 | 3 | |
| Sep 2023 | 3 | |
| Oct 2023 | 0 | |
| Nov 2023 | 0 | |
| Dec 2023 | 1 | |
| Jan 2024 | 5 | |
| Feb 2024 | 0 | |
| Mar 2024 | 7 | |
| Apr 2024 | 4 | |
| May 2024 | 0 | |
| Jun 2024 | 0 | |
| Jul 2024 | 4 | |
| Aug 2024 | 3 | |
| Sep 2024 | 0 | |
| Oct 2024 | 0 | |
| Nov 2024 | 0 | |
| Dec 2024 | 1 | |
| Jan 2025 | 1 | |
| Feb 2025 | 2 | |
| Mar 2025 | 0 | |
| Apr 2025 | 0 | |
| May 2025 | 0 | |
| Jun 2025 | 0 | |
| Jul 2025 | 3 | |
| Aug 2025 | 0 | |
| Sep 2025 | 0 | |
| Oct 2025 | 1 | |
| Nov 2025 | 0 | |
| Dec 2025 | 0 | |
| Jan 2026 | 1 | |
| Feb 2026 | 0 | |
| Mar 2026 | 1 | |
| Apr 2026 | 0 | |
| May 2026 | 0 | |
| Jun 2026 | 0 | |
| Jul 2026 | 1 | |
| Aug 2026 | 0 | |
| Sep 2026 | 1 | |
| Oct 2026 | 0 | |
| Nov 2026 | 0 |
Discharge events per year, 2016 to 2026
325 events, 2016 to 2026.
- Combined sewer overflow
- Sanitary sewer overflow
- Bypass, blended or other
- Partly covered or sparse source
CT DEEP dashboard records begin 2021-12-02; where CT DEEP's annual report covers a discharger's month, the annual report is counted instead. CT DEEP annual reports (Sewage Right-to-Know) cover 2021-01-01 to 2026-11-02. CT DEEP's reporting archive runs 2016-07-04 to 2021-12-02.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports; CT DEEP reporting archive 2016-2021. Covered 2016-07-04 to 2026-11-02.
Show table
| Year | Combined sewer overflow | Sanitary sewer overflow | Bypass, blended or other | Total | Coverage |
|---|---|---|---|---|---|
| 2016 | 0 | 19 | 1 | 20 | Partly covered or sparse source |
| 2017 | 0 | 37 | 10 | 47 | |
| 2018 | 0 | 37 | 17 | 54 | |
| 2019 | 0 | 26 | 9 | 35 | |
| 2020 | 0 | 15 | 5 | 20 | |
| 2021 | 0 | 56 | 22 | 78 | Partly covered or sparse source |
| 2022 | 0 | 16 | 3 | 19 | |
| 2023 | 0 | 7 | 12 | 19 | |
| 2024 | 0 | 8 | 10 | 18 | |
| 2025 | 0 | 9 | 0 | 9 | |
| 2026 | 0 | 3 | 3 | 6 |
Reported volume per year
Gallons, summed from the 218 events that gave a number (107 did not).
- Partly covered or sparse source
107 of 325 events gave no volume as a number (73 gave a range); only numbers are summed. Some CT DEEP annual-report volumes are given as text or ranges and are not summed. CT DEEP's 2016-2021 archive gives volumes as ranges ("20,001 - 50,000 gallons"); they are not summed.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports; CT DEEP reporting archive 2016-2021. Covered 2016-07-04 to 2026-11-02.
Show table
| Year | Gallons | Events with a number | Events without | Coverage |
|---|---|---|---|---|
| 2016 | 0 | 2 | 18 | Partly covered or sparse source |
| 2017 | 1,011,100 | 45 | 2 | |
| 2018 | 23,484,212 | 50 | 4 | |
| 2019 | 3,478,975 | 31 | 4 | |
| 2020 | 5,230 | 6 | 14 | |
| 2021 | 3,604,355 | 25 | 53 | Partly covered or sparse source |
| 2022 | 125 | 9 | 10 | |
| 2023 | 14,410,840 | 19 | 0 | |
| 2024 | 41,539,782 | 18 | 0 | |
| 2025 | 99,376 | 9 | 0 | |
| 2026 | 17,010,200 | 4 | 2 |
Hours under advisory per year
Hours under advisory each year; 2026 to date.
- Advisory in effect
- Partly covered or sparse source
62 discharge events have no reported end and no ongoing status; under the status rules they set caution, not an advisory, and add no hours here. 3 events reported to last more than 31 days are counted to 31 days. Official beach and cyanobacteria advisories are counted on water pages only.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports; CT DEEP reporting archive 2016-2021. Covered 2016-07-04 to 2026-11-02.
Show table
| Year | Hours under advisory | Share of the year | Coverage |
|---|---|---|---|
| 2016 | 1,099 | 12.5% | Partly covered or sparse source |
| 2017 | 2,470 | 28.2% | |
| 2018 | 1,423 | 16.2% | |
| 2019 | 1,306 | 14.9% | |
| 2020 | 407 | 4.6% | |
| 2021 | 1,946 | 22.2% | Partly covered or sparse source |
| 2022 | 824 | 9.4% | |
| 2023 | 759 | 8.7% | |
| 2024 | 815 | 9.3% | |
| 2025 | 323 | 3.7% | |
| 2026 | 214 | 2.9% |
Discharge events by calendar month, all years
Every counted discharge event, by the calendar month it began.
Months are summed over every year a source covers; the table gives the number of years behind each month.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports; CT DEEP reporting archive 2016-2021. Covered 2016-07-04 to 2026-11-02.
Show table
| Month | Events | Years of records |
|---|---|---|
| Jan | 25 | 10 |
| Feb | 24 | 10 |
| Mar | 30 | 10 |
| Apr | 22 | 10 |
| May | 18 | 10 |
| Jun | 17 | 10 |
| Jul | 54 | 11 |
| Aug | 39 | 11 |
| Sep | 35 | 11 |
| Oct | 31 | 11 |
| Nov | 15 | 11 |
| Dec | 15 | 10 |
Discharge events by outfall
The 10 outfalls with the most events of 170, all years.
CT DEEP dashboard records begin 2021-12-02; where CT DEEP's annual report covers a discharger's month, the annual report is counted instead. CT DEEP annual reports (Sewage Right-to-Know) cover 2021-01-01 to 2026-11-02. CT DEEP's reporting archive runs 2016-07-04 to 2021-12-02.
Sources: CT DEEP CSO/SSO dashboard; CT DEEP Sewage Right-to-Know annual reports; CT DEEP reporting archive 2016-2021. Covered 2016-07-04 to 2026-11-02.
Show table
| Outfall | Discharger | Events |
|---|---|---|
| Treatment Plant, 60 South Smith Street | Norwalk WPCA | 27 |
| 002-1 | Norwalk WPCA | 15 |
| Treatment Plant, 60 south Smith st | Norwalk WPCF | 11 |
| Treatment Plant, 60 S Smith St, Norwalk, CT | Norwalk WPCA | 10 |
| Basement, 66 Grandview Ave | Norwalk WPCA | 4 |
| Lateral - Private, 1 Pine Street | Norwalk WPCA | 4 |
| Treatment Plant, 60 south smith st 06855 | Norwalk WPCA | 4 |
| Pump Station, Karen Drive Pump Station | Norwalk WPCA | 4 |
| Lateral - Private, 34 dairy Farm Road | Norwalk WPCA | 4 |
| Manhole, 110 Patrick Avenue | Norwalk WPCA | 4 |
| Other outfalls (160) | 236 | |
| Outfall not stated | 2 |
How these charts are counted
Discharge events are counted once: where a source publishes both public notices and verified reports (MassDEP, Vermont DEC), a discharger's month with any verified report counts its verified reports only, and other months count notices. Revisions are folded into the record they revise, and EPA copies of a state report are not counted twice. Monthly and yearly totals (Maine DEP, EPA discharge monitoring reports, Portsmouth) are shown on their own and never added to the event counts. Hours under advisory follow the map's red rules. A muted band marks periods no source covers: a gap there is missing data, not a quiet month.
- CT DEEP CSO/SSO dashboard: 2021-12-02 to now
- CT DEEP Sewage Right-to-Know annual reports: 2021-01-01 to now
- CT DEEP reporting archive 2016-2021: 2016-07-04 to 2021-12-02