AQUARION STAMFORD WATER TREATMENT PLANT

Address

149 LAKESIDE DRIVE
STAMFORD, CT 06903
View on map ↗

County

FAIRFIELD County

Industry

Utilities

NAICS (North American Industry Classification)

221310

Inspections

4 · last Jul 15, 2025

Total Penalties

$0

Registry ID

110000513267

Compliance Status (Last 12 Quarters)

Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.

0

Air (CAA)
Qtrs Non-Compliant

1

Water (CWA)
Qtrs Non-Compliant

0

Hazardous Waste (RCRA)
Qtrs Non-Compliant

Compliance Violations

Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.

Program	Type	Violation Date	Return to Compliance	Status
cwa	Permit Violations - Violation Specified in Comment	Jul 15, 2025	—	Open
cwa	Reporting Violations - Failure to Submit DMRs	Jul 15, 2025	—	Open
cwa	Permit Violations - Discharge Without a Valid Permit	Sep 3, 2024	—	Open
cwa	Reporting Violations - Improper/ Incorrect Reporting	Sep 3, 2024	—	Open
cwa	Monitoring Violations - Invalid/Unrepresentative Sample	Sep 3, 2024	—	Open
cwa	Pretreatment - Failure to submit required report (non-DMR)	Sep 3, 2024	—	Open
cwa	Schedule Event reported late	Oct 25, 2023	—	Open
cwa	Schedule Event unachieved and not reported	Oct 25, 2023	Oct 17, 2024	Resolved
cwa	Schedule Event achieved late but reported	Oct 25, 2023	—	Open
cwa	Schedule Event unachieved but reported	Oct 25, 2023	Oct 17, 2024	Resolved

Discharge Limit Exceedances

Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.

Pollutant	Violation	Reported	Limit	Exceedance	Period	Status
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.16 mg/L	0.10	+60%	Sep 2022	Resolved
Copper, total [as Cu]	DMR, Limited - Numeric Violation	2.40 mg/L	2.00	+20%	Sep 2022	Open
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+12%	Sep 2022	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.15 mg/L	0.10	+50%	Aug 2022	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.21 mg/L	0.10	+110%	Jul 2022	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+3%	Jul 2022	Open
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.05 MGD	0.05	+9%	May 2022	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+9%	May 2022	Open
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+13%	Apr 2022	Open
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.05 MGD	0.05	+13%	Apr 2022	Resolved
Arsenic, total [as As]	DMR, Limited - Overdue	0.11 mg/L	0.10	+10%	Feb 2022	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.11 mg/L	0.10	+10%	Feb 2022	Open
Arsenic, total [as As]	DMR, Limited - Overdue	0.12 mg/L	0.10	+20%	Jan 2022	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.12 mg/L	0.10	+20%	Jan 2022	Open
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+4%	Nov 2021	Open
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.05 MGD	0.05	+4%	Nov 2021	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.05 MGD	0.05	+1%	Oct 2021	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+1%	Oct 2021	Open
Copper, total [as Cu]	DMR, Limited - Numeric Violation	2.70 mg/L	2.00	+35%	Sep 2021	Open
Arsenic, total [as As]	DMR, Limited - Overdue	0.12 mg/L	0.10	+20%	Sep 2021	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.12 mg/L	0.10	+20%	Sep 2021	Open
Copper, total [as Cu]	DMR, Limited - Overdue	2.70 mg/L	2.00	+35%	Sep 2021	Resolved
Arsenic, total [as As]	DMR, Limited - Overdue	0.18 mg/L	0.10	+80%	Aug 2021	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.18 mg/L	0.10	+80%	Aug 2021	Open
Arsenic, total [as As]	DMR, Limited - Overdue	0.30 mg/L	0.10	+200%	Jul 2021	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.05 MGD	0.05	+2%	Jul 2021	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+2%	Jul 2021	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.30 mg/L	0.10	+200%	Jul 2021	Open
Flow	DMR, Limited - Overdue	0.05 MGD	0.05	+5%	Jun 2021	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.14 mg/L	0.10	+40%	Jun 2021	Open
Arsenic, total [as As]	DMR, Limited - Overdue	0.14 mg/L	0.10	+40%	Jun 2021	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.06 MGD	0.05	+19%	Jun 2021	Resolved
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.06 MGD	0.05	+19%	Jun 2021	Open
Flow	DMR, Limited - Numeric Violation	0.05 MGD	0.05	+5%	Jun 2021	Open
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.06 MGD	0.05	+32%	Apr 2021	Open
Flow, maximum during 24 hr period	DMR, Limited - Overdue	0.06 MGD	0.05	+32%	Apr 2021	Resolved
Arsenic, total [as As]	DMR, Limited - Overdue	0.16 mg/L	0.10	+60%	Dec 2020	Resolved
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.16 mg/L	0.10	+60%	Dec 2020	Open

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