SHELTON, CT · Fairfield County

AQUARION-INTERLAKEN Water System

Current status

1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Connecticut’s official records. Always confirm current status with Connecticut before making decisions based on this information.

System facts

System ID (PWSID): CT0911061
System type: Community Water System
Population served: 64
Service connections: 18
Ownership: privately owned
Water source: groundwater (wells)

Violation history

Failure to Conduct Assessment Monitoring
—
E. COLI
January 1, 2022 – January 31, 2022
Resolved
Failure to Conduct Assessment Monitoring
—
E. COLI
July 1, 2019 – July 31, 2019
Archived
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2017 – July 24, 2017
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
December 10, 2016 – April 21, 2017
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
October 10, 2016 – December 1, 2016
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2015 – July 20, 2015
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2013 – July 9, 2013
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – August 27, 2012
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
August 10, 2011 – August 27, 2011
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2011 – August 27, 2011
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
October 1, 2010 – July 20, 2016
Resolved
Consumer Confidence Report Inadequate Reporting
—
Consumer Confidence Rule
August 10, 2009
Unaddressed
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2008 – July 14, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2006 – October 31, 2006
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2004 – November 8, 2004
Resolved
Initial Tap Sampling for Pb and Cu
—
Lead and Copper Rule
July 1, 1994 – March 29, 1996
Resolved
Notification, Public
—
ETHYLENE DIBROMIDE
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
Chloromethane
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
m-Dichlorobenzene
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
1,1-Dichloroethylene
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
1,1-Dichloroethane
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
1,2-Dichloroethane
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
Trichloroethylene
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
o-Xylene
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
Dibromomethane
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
cis-1,2-Dichloroethylene
March 1, 1994 – March 31, 1994
Resolved
Notification, Public
—
Chloroethane
March 1, 1994 – March 31, 1994
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 1993 – September 30, 1993
Resolved
Monitoring, Regular
—
Benzene
January 1, 1991 – December 31, 1991
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 1991 – December 31, 1991
Resolved
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 1991 – December 31, 1991
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 1991 – December 31, 1991
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 1991 – December 31, 1991
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)Unaddressed no corrective action on record yet

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2022 – January 31, 2022	Failure to Conduct Assessment Monitoring	E. COLI	—	Resolved
July 1, 2019 – July 31, 2019	Failure to Conduct Assessment Monitoring	E. COLI	—	Archived
July 1, 2017 – July 24, 2017	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
December 10, 2016 – April 21, 2017	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
October 10, 2016 – December 1, 2016	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
July 1, 2015 – July 20, 2015	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2013 – July 9, 2013	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2012 – August 27, 2012	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
August 10, 2011 – August 27, 2011	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
July 1, 2011 – August 27, 2011	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
October 1, 2010 – July 20, 2016	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Resolved
August 10, 2009	Consumer Confidence Report Inadequate Reporting	Consumer Confidence Rule	—	Unaddressed
July 1, 2008 – July 14, 2008	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
October 1, 2006 – October 31, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2004 – November 8, 2004	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 1994 – March 29, 1996	Initial Tap Sampling for Pb and Cu	Lead and Copper Rule	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	ETHYLENE DIBROMIDE	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	Chloromethane	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	m-Dichlorobenzene	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	1,1-Dichloroethylene	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	1,1-Dichloroethane	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	1,2-Dichloroethane	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	Trichloroethylene	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	o-Xylene	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	Dibromomethane	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	cis-1,2-Dichloroethylene	—	Resolved
March 1, 1994 – March 31, 1994	Notification, Public	Chloroethane	—	Resolved
July 1, 1993 – September 30, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 1991 – December 31, 1991	Monitoring, Regular	Benzene	—	Resolved
January 1, 1991 – December 31, 1991	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 1991 – December 31, 1991	Monitoring, Regular	1,1,1-Trichloroethane	—	Resolved
January 1, 1991 – December 31, 1991	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 1991 – December 31, 1991	Monitoring, Regular	p-Dichlorobenzene	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)Unaddressed no corrective action on record yet

Enforcement actions

October 8, 2025State Intentional no-action1 linked violation
November 8, 2022State Public Notification received1 linked violation
April 5, 2022State Public Notification requested1 linked violation
April 5, 2022State Violation/Reminder Notice1 linked violation
February 28, 2022State Compliance achieved1 linked violation
April 28, 2020State Violation/Reminder Notice1 linked violation
February 21, 2020State Intentional no-action1 linked violation
February 21, 2020State Compliance achieved1 linked violation
December 10, 2019State Public Notification requested1 linked violation
December 10, 2019State Violation/Reminder Notice1 linked violation
October 26, 2018State Compliance achieved1 linked violation
October 4, 2018State Violation/Reminder Notice1 linked violation
December 12, 2017State Violation/Reminder Notice1 linked violation
September 12, 2017State Compliance achieved1 linked violation
July 24, 2017State Compliance achieved1 linked violation
May 17, 2017State Public Notification received2 linked violations
April 28, 2017State Public Notification requested1 linked violation
April 28, 2017State Violation/Reminder Notice1 linked violation
April 21, 2017State Compliance achieved1 linked violation
April 20, 2017State Public Notification requested1 linked violation
April 20, 2017State Violation/Reminder Notice1 linked violation
April 6, 2017State Public Notification received2 linked violations
March 10, 2017State Public Notification requested1 linked violation
March 10, 2017State Violation/Reminder Notice1 linked violation
December 1, 2016State Compliance achieved2 linked violations
July 20, 2016State Compliance achieved1 linked violation
July 13, 2016State Compliance achieved1 linked violation
October 28, 2015State Violation/Reminder Notice1 linked violation
July 20, 2015State Compliance achieved1 linked violation
July 9, 2013State Compliance achieved3 linked violations
November 28, 2012State Violation/Reminder Notice1 linked violation
December 12, 2011State Violation/Reminder Notice119 linked violations
August 27, 2011State Compliance achieved1 linked violation
August 27, 2011State Compliance achieved1 linked violation
July 14, 2008State Compliance achieved1 linked violation
July 9, 2007State Compliance achieved1 linked violation
July 9, 2007State Public Notification received3 linked violations
July 2, 2007State Violation/Reminder Notice1 linked violation
June 30, 2007State Compliance achieved2 linked violations
May 17, 2007State Compliance achieved2 linked violations
December 5, 2006State Public Notification requested1 linked violation
November 9, 2006State Violation/Reminder Notice2 linked violations
October 31, 2006State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
October 31, 2006State Public Notification requested1 linked violation
November 18, 1994State Public Notification received161 linked violations
August 23, 1993State Violation/Reminder Notice11 linked violations
December 31, 1992State Compliance achieved12 linked violations
December 31, 1985State Compliance achievedgeneral compliance action — not tied to a specific violation on record
June 30, 1984State Compliance achievedgeneral compliance action — not tied to a specific violation on record

Contact

ULRICH, ROBERT J.

203-926-4320

SHELTON, CT 06484