AMHERST W W T P
NPDES ID: MA0100218
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: 5 effluent violations, 2 reporting violations.
Violations
June 30, 2026
Chlorine, total residual
4% over limit
Discharged 1.04 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 216.19479818 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, total [as N]
1% over limit
Discharged 216.42179818 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, total [as N]
1% over limit
Discharged 216.87579818 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
13% over limit
Discharged 461.1 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, total [as N]
0% over limit
Discharged 215.92239819 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Fluorine, adsorbable organic
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Fluorine, adsorbable organic
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
December 31, 2025
pH
0% over limit
Discharged 5.77 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
2% over limit
Discharged 218.96419816 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
November 30, 2025
pH
0% over limit
Discharged 5.3 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, total [as N]
0% over limit
Discharged 215.64999819 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Fluorine, adsorbable organic
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Fluorine, adsorbable organic
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
E. coli, thermotol, MF, MTEC
492% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, total [as N]
2% over limit
Discharged 219.23659816 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, total [as N]
4% over limit
Discharged 224.77539811 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
22% over limit
Discharged 1.22 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, total [as N]
5% over limit
Discharged 224.95699811 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
492% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
9% over limit
Discharged 1323.36458888 kg/d against a permitted limit of 1209.90998983 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
191% over limit
Discharged 56.4 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
3% over limit
Discharged 220.96179814 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 48.5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 5.9 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
Chlorine, total residual
6% over limit
Discharged 1.06 mg/L against a permitted limit of 1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
pH
0% over limit
Discharged 5.99 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 216.05859818 kg/d against a permitted limit of 215.19599819 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
E. coli, thermotol, MF, MTEC
50% over limit
Discharged 613.1 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, suspended percent removal
781% over limit
Discharged -32.1 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, total suspended
1% over limit
Discharged 814.02199316 kg/d against a permitted limit of 806.30399323 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
112% over limit
Discharged 95.3 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
137% over limit
Discharged 2863.55957594 kg/d against a permitted limit of 1209.90998983 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous, percent removal
226% over limit
Discharged 51.1 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
January 31, 2025
pH
0% over limit
Discharged 4.99 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
August 31, 2024
E. coli, thermotol, MF, MTEC
492% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 409 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (10 hours ago)