GROTON WPCF
NPDES ID: CT0100242
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 10 effluent violations, 2 single-event violations.
Violations
June 30, 2026
Solids, total suspended
162% over limit
Discharged 131 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2026
Coliform, fecal - % samples exceeding limit
20% over limit
Discharged 12 % against a permitted limit of 10 % (INST MAX)
DMR, Limited - Numeric Violation
Solids, total suspended
414% over limit
Discharged 257 mg/L against a permitted limit of 50 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
17% over limit
Discharged 35 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Enterococci
384% over limit
Discharged 2419 MPN/100mL against a permitted limit of 500 MPN/100mL (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
33% over limit
Discharged 80 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (5 months ago)
Last confirmed
September 15, 2026 (4 days ago)