HARTFORD WWTP
NPDES ID: MI0023094
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: 7 effluent violations, 2 permit schedule violations.
Violations
May 31, 2026
Chlorine, total residual
5% over limit
Discharged 0.04 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
22% over limit
Discharged 489 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
56% over limit
Discharged 311 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
19% over limit
Discharged 0.00000356 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Chlorine, total residual
5% over limit
Discharged 0.04 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
19% over limit
Discharged 0.00000356 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
3% over limit
Discharged 206 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
March 31, 2026
Mercury, total [as Hg]
16% over limit
Discharged 0.00000347 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
5% over limit
Discharged 0.04 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Mercury, total [as Hg]
16% over limit
Discharged 0.00000347 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Mercury, total [as Hg]
16% over limit
Discharged 0.00000347 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chloride [as Cl]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
12% over limit
Discharged 0.00000336 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
58% over limit
Discharged 0.06 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Chlorine, total residual
5% over limit
Discharged 0.04 mg/L against a permitted limit of 0.038 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
27% over limit
Discharged 0.0000038 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Mercury, total [as Hg]
27% over limit
Discharged 0.0000038 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Mercury, total [as Hg]
36% over limit
Discharged 0.00000407 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Mercury, total [as Hg]
38% over limit
Discharged 0.00000413 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
32% over limit
Discharged 263 MPN/100mL against a permitted limit of 200 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
May 31, 2025
Mercury, total [as Hg]
7% over limit
Discharged 0.0000032 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Mercury, total [as Hg]
17% over limit
Discharged 0.0000035 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
January 31, 2025
Mercury, total [as Hg]
0% over limit
Discharged 0.0000029 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Solids, suspended percent removal
20% over limit
Discharged 82 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 0.0000029 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 2.2 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
13% over limit
Discharged 0.00000339 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Overdue
Mercury, total [as Hg]
13% over limit
Discharged 0.00000339 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
Mercury, total [as Hg]
0% over limit
Discharged 2.2 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0.00000216 kg/d against a permitted limit of 0.00000363 kg/d (12MO AVG)
DMR, Limited - Overdue
December 31, 2024
Mercury, total [as Hg]
20% over limit
Discharged 0.0000036 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Mercury, total [as Hg]
7% over limit
Discharged 0.0000032 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.00000363 kg/d (12MO AVG)
DMR, Limited - Overdue
Mercury, total [as Hg]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
September 30, 2024
Mercury, total [as Hg]
7% over limit
Discharged 0.0000032 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Mercury, total [as Hg]
7% over limit
Discharged 0.0000032 mg/L against a permitted limit of 0.000003 mg/L (12MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (7 days ago)