COGSWELL SPRINGS WATER WORKS
New Hampshire — Community Water System — PWSID: NH1121010
System Information
| PWSID | NH1121010 |
| System Name | COGSWELL SPRINGS WATER WORKS |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Local |
| EPA Region | 01 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 8, 1979 |
| Last Reported | Dec 15, 2025 |
Location & Contact
| State | New Hampshire |
| City | HENNIKER |
| ZIP Code | 03242 |
| Address | 18 DEPOT HILL RD |
| Organization | COGSWELL SPRINGS WATER WORKS |
| Phone | — |
Population & Service
| Population Served | 3,000 |
| Service Connections | 581 |
Drinking Water Violations (22)
This water system has 22 violations recorded in the EPA SDWIS database.
| Begin Date | End Date | Contaminant | Category | Health-Based | Major | Measured | Federal MCL | State MCL | Status | Return to Compliance | Rule |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Dec 30, 2019 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 27, 2020 | Lead and Copper Rule |
| Dec 30, 2019 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 27, 2020 | Lead and Copper Rule |
| Jun 8, 2017 | — | E. COLI | MR | No | Yes | — | — | — | Resolved | Jun 22, 2017 | Ground Water Rule |
| Jun 8, 2017 | — | E. COLI | MR | No | Yes | — | — | — | Resolved | Jun 22, 2017 | Ground Water Rule |
| Oct 1, 2010 | Oct 31, 2010 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2010 | Total Coliform Rule |
| Oct 1, 2010 | Oct 31, 2010 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2010 | Total Coliform Rule |
| Oct 1, 2010 | Oct 31, 2010 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2010 | Total Coliform Rule |
| Aug 1, 2010 | Aug 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2010 | Total Coliform Rule |
| Aug 1, 2010 | Aug 31, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Aug 31, 2010 | Total Coliform Rule |
| Apr 1, 2010 | Apr 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Apr 30, 2010 | Total Coliform Rule |
| Apr 1, 2010 | Apr 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Apr 30, 2010 | Total Coliform Rule |
| Apr 1, 2010 | Apr 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Apr 30, 2010 | Total Coliform Rule |
| Apr 1, 2010 | Apr 30, 2010 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Apr 30, 2010 | Total Coliform Rule |
| Sep 1, 2008 | Sep 30, 2008 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2008 | Total Coliform Rule |
| Sep 1, 2008 | Sep 30, 2008 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2008 | Total Coliform Rule |
| Sep 1, 2008 | Sep 30, 2008 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2008 | Total Coliform Rule |
| Sep 1, 2008 | Sep 30, 2008 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2008 | Total Coliform Rule |
| Oct 1, 2004 | Oct 31, 2004 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2004 | Total Coliform Rule |
| Oct 1, 2004 | Oct 31, 2004 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2004 | Total Coliform Rule |
| Oct 1, 2004 | Oct 31, 2004 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Oct 31, 2004 | Total Coliform Rule |
| Aug 1, 1994 | Aug 31, 1994 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Archived | Aug 31, 1994 | Total Coliform Rule |
| Mar 1, 1991 | Mar 31, 1991 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Mar 31, 1991 | Total Coliform Rule |
About This Water System
Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.