AQUARION-RIDGEFIELD KNOLLS
Connecticut — Community Water System — PWSID: CT1180021
System Information
| PWSID | CT1180021 |
| System Name | AQUARION-RIDGEFIELD KNOLLS |
| System Type | Community Water System |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 01 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 8, 1979 |
| Last Reported | Dec 15, 2025 |
Location & Contact
| State | Connecticut |
| City | SHELTON |
| ZIP Code | 06484 |
| Address | 505 Huntington St. |
| Organization | ULRICH, ROBERT J. |
| Phone | 203-926-4320 |
Population & Service
| Population Served | 958 |
| Service Connections | 223 |
Drinking Water Violations (225)
This water system has 225 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, 2021 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jan 21, 2022 | Lead and Copper Rule |
| Jul 1, 2018 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Jul 9, 2018 | Consumer Confidence Rule |
| Jul 1, 2018 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Jul 9, 2018 | Consumer Confidence Rule |
| Dec 30, 2015 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Unaddressed | — | Lead and Copper Rule |
| Jul 1, 2008 | — | Lead and Copper Rule | TT | Yes | No | — | TT | — | Resolved | Jan 23, 2009 | Lead and Copper Rule |
| Jul 1, 2008 | — | Lead and Copper Rule | TT | Yes | No | — | TT | — | Resolved | Jan 23, 2009 | Lead and Copper Rule |
| Mar 1, 2008 | — | Lead and Copper Rule | TT | Yes | No | — | TT | — | Resolved | Jan 12, 2009 | Lead and Copper Rule |
| Jan 1, 2007 | Dec 31, 2007 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 2007 | Lead and Copper Rule |
| Jan 1, 2007 | Dec 31, 2007 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 2007 | Lead and Copper Rule |
| Jan 1, 2007 | Dec 31, 2007 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 2007 | Lead and Copper Rule |
| Jan 1, 2007 | Dec 31, 2007 | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Dec 31, 2007 | Lead and Copper Rule |
| Dec 1, 2006 | Dec 31, 2006 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Dec 31, 2006 | Total Coliform Rule |
| Jan 1, 2005 | — | Lead and Copper Rule | TT | Yes | No | — | TT | — | Resolved | Dec 31, 2006 | Lead and Copper Rule |
| Jan 1, 2005 | — | Lead and Copper Rule | TT | Yes | No | — | TT | — | Resolved | Dec 31, 2006 | Lead and Copper Rule |
| Aug 10, 2004 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Nov 15, 2004 | Consumer Confidence Rule |
| Aug 10, 2004 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Nov 15, 2004 | Consumer Confidence Rule |
| Jul 1, 2004 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Nov 15, 2004 | Consumer Confidence Rule |
| Jul 1, 2004 | — | Consumer Confidence Rule | Other | No | No | — | — | — | Resolved | Nov 15, 2004 | Consumer Confidence Rule |
| Jan 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jun 22, 2004 | Lead and Copper Rule |
| Jan 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jun 22, 2004 | Lead and Copper Rule |
| Jan 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jun 22, 2004 | Lead and Copper Rule |
| Jan 1, 2004 | — | Lead and Copper Rule | MR | No | No | — | TT | — | Resolved | Jun 22, 2004 | Lead and Copper Rule |
| Nov 1, 2003 | Nov 30, 2003 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Nov 30, 2003 | Total Coliform Rule |
| Nov 1, 2003 | Nov 30, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2003 | Total Coliform Rule |
| Nov 1, 2003 | Nov 30, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2003 | Total Coliform Rule |
| Nov 1, 2003 | Nov 30, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2003 | Total Coliform Rule |
| Nov 1, 2003 | Nov 30, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2003 | Total Coliform Rule |
| Jul 1, 2003 | Jul 31, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2003 | Total Coliform Rule |
| Jul 1, 2003 | Jul 31, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2003 | Total Coliform Rule |
| Jul 1, 2003 | Jul 31, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2003 | Total Coliform Rule |
| Jul 1, 2003 | Jul 31, 2003 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2003 | Total Coliform Rule |
| Nov 1, 2002 | Nov 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2002 | Total Coliform Rule |
| Nov 1, 2002 | Nov 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2002 | Total Coliform Rule |
| Nov 1, 2002 | Nov 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2002 | Total Coliform Rule |
| Nov 1, 2002 | Nov 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2002 | Total Coliform Rule |
| Sep 1, 2002 | Sep 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | Total Coliform Rule |
| Sep 1, 2002 | Sep 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | Total Coliform Rule |
| Sep 1, 2002 | Sep 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | Total Coliform Rule |
| Sep 1, 2002 | Sep 30, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | Total Coliform Rule |
| Jul 1, 2002 | Jul 31, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2002 | Total Coliform Rule |
| Jul 1, 2002 | Jul 31, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2002 | Total Coliform Rule |
| Jul 1, 2002 | Jul 31, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2002 | Total Coliform Rule |
| Jul 1, 2002 | Jul 31, 2002 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Jul 31, 2002 | Total Coliform Rule |
| Feb 1, 2001 | Feb 28, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 18, 2000 | Total Coliform Rule |
| Feb 1, 2001 | Feb 28, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 18, 2000 | Total Coliform Rule |
| Feb 1, 2001 | Feb 28, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 18, 2000 | Total Coliform Rule |
| Feb 1, 2001 | Feb 28, 2001 | Coliform (TCR) | MR | No | No | — | 5% of samples | — | Resolved | Jun 18, 2000 | Total Coliform Rule |
| Aug 1, 2000 | Aug 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 2000 | Total Coliform Rule |
| Aug 1, 2000 | Aug 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 2000 | Total Coliform Rule |
| Aug 1, 2000 | Aug 31, 2000 | Coliform (TCR) | MCL | Yes | No | — | 5% of samples | — | Resolved | Aug 31, 2000 | 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.