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	Dec 15, 2025

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 (39)

This water system has 39 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	Nitrite	MR	No	Yes	—	1 mg/L	—	Archived	Dec 31, 2024	Nitrate Rule
Jan 1, 2024	Dec 31, 2024	Nitrate	MR	No	Yes	—	10 mg/L	—	Archived	Dec 31, 2024	Nitrate Rule
Jan 1, 2024	Dec 31, 2024	Nitrate	MR	No	Yes	—	10 mg/L	—	Archived	Dec 31, 2024	Nitrate Rule
Jan 1, 2024	Dec 31, 2024	Nitrite	MR	No	Yes	—	1 mg/L	—	Archived	Dec 31, 2024	Nitrate Rule
Oct 1, 2013	Dec 31, 2013	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 2013	Total Coliform Rule
Oct 1, 2013	Dec 31, 2013	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 2013	Total Coliform Rule
Oct 1, 2013	Dec 31, 2013	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 2013	Total Coliform Rule
Oct 1, 2013	Dec 31, 2013	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Nov 30, 2013	Total Coliform Rule
Jul 1, 2011	Sep 30, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2011	Total Coliform Rule
Jul 1, 2011	Sep 30, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2011	Total Coliform Rule
Jul 1, 2011	Sep 30, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2011	Total Coliform Rule
Jul 1, 2011	Sep 30, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2011	Total Coliform Rule
Jan 1, 2011	Mar 31, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Feb 28, 2011	Total Coliform Rule
Jan 1, 2011	Mar 31, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Feb 28, 2011	Total Coliform Rule
Jan 1, 2011	Mar 31, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Feb 28, 2011	Total Coliform Rule
Jan 1, 2011	Mar 31, 2011	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Feb 28, 2011	Total Coliform Rule
Jul 1, 2010	Sep 30, 2010	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2010	Total Coliform Rule
Jul 1, 2010	Sep 30, 2010	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2010	Total Coliform Rule
Jul 1, 2010	Sep 30, 2010	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Sep 30, 2010	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Oct 31, 2002	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Oct 31, 2002	Total Coliform Rule
Oct 1, 2002	Oct 31, 2002	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Oct 31, 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	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jan 9, 2004	Lead and Copper Rule
Jul 1, 2002	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jan 9, 2004	Lead and Copper Rule
Jul 1, 2002	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jan 9, 2004	Lead and Copper Rule
Apr 1, 1994	Apr 30, 1994	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Apr 30, 1994	Total Coliform Rule
Apr 1, 1994	Apr 30, 1994	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Apr 30, 1994	Total Coliform Rule
Apr 1, 1994	Apr 30, 1994	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Apr 30, 1994	Total Coliform Rule
Mar 1, 1994	Mar 31, 1994	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Mar 31, 1994	Total Coliform Rule
Mar 1, 1994	Mar 31, 1994	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Mar 31, 1994	Total Coliform Rule
Mar 1, 1994	Mar 31, 1994	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Mar 31, 1994	Total Coliform Rule
Oct 1, 1993	Dec 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Dec 31, 1993	Total Coliform Rule
Oct 1, 1993	Dec 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Dec 31, 1993	Total Coliform Rule
Oct 1, 1993	Dec 31, 1993	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Dec 31, 1993	Total Coliform Rule
—	—		—	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.

Browse All Water Systems Water Safety Stats Water Safety Home

Browse All Water Systems Water Systems in Connecticut