STONINGTON INSTITUTE - KNOLLWOOD
Connecticut — Transient Non-Community — PWSID: CT1020483
System Information
| PWSID | CT1020483 |
| System Name | STONINGTON INSTITUTE - KNOLLWOOD |
| System Type | Transient Non-Community |
| Water Source | Ground Water |
| Activity Status | Active |
| Owner Type | Private |
| EPA Region | 01 |
| Serves School | No |
| Wholesaler | No |
| First Reported | Mar 15, 1994 |
| Last Reported | Mar 30, 2026 |
Location & Contact
| State | Connecticut |
| City | NORTH STONINGTON |
| ZIP Code | 06359 |
| Address | 75 Swantown Hill Rd. |
| Organization | WORST, HOWARD |
| Phone | 860-235-6132 |
Population & Service
| Population Served | 77 |
| Service Connections | 1 |
Drinking Water Violations (41)
This water system has 41 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan 1, 2024 | Dec 31, 2024 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2024 | — | |
| Jan 1, 2024 | Dec 31, 2024 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2024 | — | |
| Jan 1, 2024 | Dec 31, 2024 | MR | No | Yes | — | 10 mg/L | — | Resolved | Dec 31, 2024 | — | |
| Jan 1, 2024 | Dec 31, 2024 | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2024 | — | |
| Jan 1, 2024 | Dec 31, 2024 | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2024 | — | |
| Jan 1, 2024 | Dec 31, 2024 | MR | No | Yes | — | 1 mg/L | — | Resolved | Dec 31, 2024 | — | |
| Oct 1, 2013 | Dec 31, 2013 | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2013 | — | |
| Oct 1, 2013 | Dec 31, 2013 | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2013 | — | |
| Oct 1, 2013 | Dec 31, 2013 | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2013 | — | |
| Oct 1, 2013 | Dec 31, 2013 | MCL | Yes | No | — | 5% of samples | — | Resolved | Nov 30, 2013 | — | |
| Jul 1, 2011 | Sep 30, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | — | |
| Jul 1, 2011 | Sep 30, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | — | |
| Jul 1, 2011 | Sep 30, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | — | |
| Jul 1, 2011 | Sep 30, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2011 | — | |
| Jan 1, 2011 | Mar 31, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 28, 2011 | — | |
| Jan 1, 2011 | Mar 31, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 28, 2011 | — | |
| Jan 1, 2011 | Mar 31, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 28, 2011 | — | |
| Jan 1, 2011 | Mar 31, 2011 | MCL | Yes | No | — | 5% of samples | — | Resolved | Feb 28, 2011 | — | |
| Jul 1, 2010 | Sep 30, 2010 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2010 | — | |
| Jul 1, 2010 | Sep 30, 2010 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2010 | — | |
| Jul 1, 2010 | Sep 30, 2010 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2010 | — | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2002 | — | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2002 | — | |
| Oct 1, 2002 | Oct 31, 2002 | MR | No | No | — | 5% of samples | — | Resolved | Oct 31, 2002 | — | |
| Sep 1, 2002 | Sep 30, 2002 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | — | |
| Sep 1, 2002 | Sep 30, 2002 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | — | |
| Sep 1, 2002 | Sep 30, 2002 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | — | |
| Sep 1, 2002 | Sep 30, 2002 | MCL | Yes | No | — | 5% of samples | — | Resolved | Sep 30, 2002 | — | |
| Jul 1, 2002 | — | MR | No | No | — | TT | — | Resolved | Jan 9, 2004 | — | |
| Jul 1, 2002 | — | MR | No | No | — | TT | — | Resolved | Jan 9, 2004 | — | |
| Jul 1, 2002 | — | MR | No | No | — | TT | — | Resolved | Jan 9, 2004 | — | |
| Apr 1, 1994 | Apr 30, 1994 | MCL | Yes | No | — | 5% of samples | — | Resolved | Apr 30, 1994 | — | |
| Apr 1, 1994 | Apr 30, 1994 | MCL | Yes | No | — | 5% of samples | — | Resolved | Apr 30, 1994 | — | |
| Apr 1, 1994 | Apr 30, 1994 | MCL | Yes | No | — | 5% of samples | — | Resolved | Apr 30, 1994 | — | |
| Mar 1, 1994 | Mar 31, 1994 | MCL | Yes | No | — | 5% of samples | — | Resolved | Mar 31, 1994 | — | |
| Mar 1, 1994 | Mar 31, 1994 | MCL | Yes | No | — | 5% of samples | — | Resolved | Mar 31, 1994 | — | |
| Mar 1, 1994 | Mar 31, 1994 | MCL | Yes | No | — | 5% of samples | — | Resolved | Mar 31, 1994 | — | |
| Oct 1, 1993 | Dec 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Dec 31, 1993 | — | |
| Oct 1, 1993 | Dec 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Dec 31, 1993 | — | |
| Oct 1, 1993 | Dec 31, 1993 | MCL | Yes | No | — | 5% of samples | — | Resolved | Dec 31, 1993 | — | |
| — | — | — | No | No | — | — | — | — | — | — |
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.