New Hampshire / Reports /
New Hampshire sewage discharges in 2026
37 records of sewage discharges and water advisories in New Hampshire dated in 2026, newest first, 3 earlier versions or duplicates included and marked. Each record keeps the source's own times and wording; a record from the last six months, or one still in effect, also has a page of its own.
By type: Combined sewer overflow (CSO)30 · Sanitary sewer overflow (SSO)5 · Treatment plant bypass2
By source: City of Nashua Wastewater Department (History of CSO Occurrences PDF)20 · City of Manchester EPD (CSO Discharge Notification page)10 · EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators)5 · Town of Exeter DPW (Combined Sewer & Sanitary Sewer Overflows page)2
2026 in other states: Connecticut, Maine, Massachusetts, New Jersey, New York, Pennsylvania, Rhode Island, Vermont.
Source: the agencies, sewer operators and EPA records named on each row and on the Sources page. Updated 2026-11-02 21:26 UTC.
| Start | Type | Water | Sewer operator | Outlet | Volume | Status and end | Source and record |
|---|---|---|---|---|---|---|---|
| Combined sewer overflow (CSO)Earlier version | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14032, reported Oct 18, 2026, 8:23 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14033, reported Oct 18, 2026, 8:23 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14026, reported Oct 14, 2026, 12:08 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14024, reported Oct 12, 2026, 3:04 PM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14023, reported Oct 12, 2026, 1:53 PM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO)Earlier version | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14022, reported Oct 11, 2026, 9:21 PM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14013, reported Oct 7, 2026, 5:22 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14011, reported Oct 3, 2026, 11:38 PM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO)Earlier version | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14010, reported Oct 3, 2026, 11:39 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River, Piscataquog River | City of Manchester DPW Environmental Protection Division | not provided | volume not reported | Ended (as reported); end time not reported | City of Manchester EPD (CSO Discharge Notification page) via History of CSO Occurrences PDF, record manchester:Item14000, reported Sep 29, 2026, 11:39 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Sanitary sewer overflow (SSO) | Contoocook River | JAFFREY SANITARY SEWER SYSTEM | not provided | 25 gallons | Ended (as reported); Sep 24, 2026, 5:45 PM EDT | EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators) via ECHO NPDES Sewer Overflow and Bypass Event Dataset, record NH0100595:12:1, reported Sep 25, 2026, 12:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Sanitary sewer overflow (SSO) | Contoocook River | JAFFREY SANITARY SEWER SYSTEM | not provided | 20 gallons | Ended (as reported); Sep 23, 2026, 4:45 PM EDT | EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators) via ECHO NPDES Sewer Overflow and Bypass Event Dataset, record NH0100595:11:1, reported Sep 23, 2026, 12:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Treatment plant bypass | Squamscott River | Town of Exeter WWTP | Wastewater Treatment Plant | 488 gallons | Ended (as reported); Sep 17, 2026, 11:48 PM EDT | Town of Exeter DPW (Combined Sewer & Sanitary Sewer Overflows page) via History of CSO Occurrences PDF, record exeter:bypass:2026-09-17:1, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Sanitary sewer overflow (SSO) | Contoocook River | JAFFREY SANITARY SEWER SYSTEM | not provided | 100 gallons | Ended (as reported); Sep 12, 2026, 5:30 PM EDT | EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators) via ECHO NPDES Sewer Overflow and Bypass Event Dataset, record NH0100595:10:1, reported Sep 14, 2026, 12:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 003 Farmington Rd. | 208,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:003, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 004 Burke St. | 1.04 million gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:004, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 005 East Hollis St. | 1.89 million gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:005, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 006 Nashua River | 6.47 million gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:006, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 007 Tampa St. | 3.2 million gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:007, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 166,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 009 Lock St. | 7,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:009, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 014 Bridge St. | 10.3 million gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-08-03:014, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 005 East Hollis St. | 13,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-30:005, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 006 Nashua River | 5,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-30:006, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 13,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-30:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 1,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-29:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 004 Burke St. | 117,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-28:004, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 005 East Hollis St. | 1,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-28:005, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 28,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-28:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Merrimack River | City of Nashua Wastewater Department | 005 East Hollis St. | 2,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-22:005, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 1,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-07-22:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Treatment plant bypass | Squamscott River | Town of Exeter WWTP | 001 WWTP outfall 001 | 340 gallons | Ended (as reported); Jun 25, 2026, 1:43 AM EDT | Town of Exeter DPW (Combined Sewer & Sanitary Sewer Overflows page) via History of CSO Occurrences PDF, record exeter:bypass:2026-06-25:1, the source gives no report time, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Sanitary sewer overflow (SSO) | Contoocook River | JAFFREY SANITARY SEWER SYSTEM | not provided | 100 gallons | Ended (as reported); May 26, 2026, 8:00 AM EDT | EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators) via ECHO NPDES Sewer Overflow and Bypass Event Dataset, record NH0100595:9:1, reported May 26, 2026, 12:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 10,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-05-25:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Read report | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 2,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-04-17:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Full record | |
| Combined sewer overflow (CSO) | Nashua River | City of Nashua Wastewater Department | 008 Broad St. | 3,000 gallons | Ended (as reported); end time not reported | City of Nashua Wastewater Department (History of CSO Occurrences PDF), record nashua:2026-04-14:008, the source gives no report time, retrieved 2026-11-02 15:54 UTC · Original notice · Full record | |
| Sanitary sewer overflow (SSO) | Piscataquog River | City of Manchester DPW Environmental Protection Division (Manchester WWTF, 300 Winston St, and 15 CSOs) | not provided | 1,070 gallons | Ended (as reported); Apr 14, 2026, 12:00 PM EDT | EPA ECHO Sewer Overflow and Bypass Event report (reported to regulators) via ECHO NPDES Sewer Overflow and Bypass Event Dataset, record NH0100447:59:1, reported Apr 17, 2026, 12:00 AM EDT, retrieved 2026-11-02 21:19 UTC · Original notice · Full record |