SOMERSET W P C F
NPDES ID: MA0100676
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: 1 effluent violation.
Violations
May 31, 2026
Nitrogen, total [as N]
41% over limit
Discharged 111.72939906 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Chlorine, total residual
17% over limit
Discharged 0.14 mg/L against a permitted limit of 0.12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Chlorine, total residual
171% over limit
Discharged 0.57 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Chlorine, total residual
119% over limit
Discharged 0.46 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Chlorine, total residual
117% over limit
Discharged 0.26 mg/L against a permitted limit of 0.12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
324% over limit
Discharged 0.89 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Chlorine, total residual
100% over limit
Discharged 0.42 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Flow, in conduit or thru treatment plant
0% over limit
Discharged 3.3 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 10 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Enterococci
27% over limit
Discharged 132 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Enterococci
27% over limit
Discharged 132 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrite + Nitrate total [as N]
0% over limit
Discharged 3 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 3 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 95 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 10 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, suspended percent removal
0% over limit
Discharged 97 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 71.4141994 kg/d against a permitted limit of 477.15399599 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 7.3 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.04 mg/L against a permitted limit of 0.12 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 67.87299943 kg/d against a permitted limit of 715.50399399 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 78.85979934 kg/d against a permitted limit of 715.50399399 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 6.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 133.6 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 7.2 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 54.02599955 kg/d against a permitted limit of 477.15399599 kg/d (MO AVG)
DMR, Limited - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 4 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Enterococci
0% over limit
Discharged 18 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.9 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 3.02 MGD against a permitted limit of 4.2 MGD (ROLL AVG)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 2 MPN/100mL against a permitted limit of 88 MPN/100mL (MO GEO)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 4 MPN/100mL against a permitted limit of 260 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 4.9 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 8.4 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.3 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.14 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 7.15 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 7.9 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 76 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
October 31, 2025
Nitrogen, total [as N]
10% over limit
Discharged 87.71279926 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, total [as N]
10% over limit
Discharged 87.71279926 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Chlorine, total residual
0% over limit
Discharged 0.2 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 9.86 MPN/100mL against a permitted limit of 88 MPN/100mL (MO GEO)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 209.74799824 kg/d against a permitted limit of 477.15399599 kg/d (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.08 mg/L against a permitted limit of 0.12 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 21 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 12.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 33.2 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 49.03199959 kg/d against a permitted limit of 715.50399399 kg/d (WKLY AVG)
DMR, Limited - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 1.77 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 7.25 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.4 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 32 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 11 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 84.89799929 kg/d against a permitted limit of 715.50399399 kg/d (WKLY AVG)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 98 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 1.8 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 2.2 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Enterococci
5% over limit
Discharged 36.8 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Overdue
Enterococci
5% over limit
Discharged 36.8 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.7 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Coliform, fecal general
563% over limit
Discharged 1723 MPN/100mL against a permitted limit of 260 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Coliform, fecal general
563% over limit
Discharged 1723 MPN/100mL against a permitted limit of 260 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
0% over limit
Discharged 95 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 2.8 MGD against a permitted limit of 4.2 MGD (ROLL AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 21.2 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 103.51199913 kg/d against a permitted limit of 477.15399599 kg/d (MO AVG)
DMR, Limited - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 19.5 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 15 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 304 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
16% over limit
Discharged 92.38899922 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
16% over limit
Discharged 92.38899922 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 32.8 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 269 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Enterococci
1438% over limit
Discharged 1600 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Enterococci
1438% over limit
Discharged 1600 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrite + Nitrate total [as N]
0% over limit
Discharged 5.5 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
July 31, 2025
Nitrogen, total [as N]
6% over limit
Discharged 84.44399929 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, total [as N]
9% over limit
Discharged 86.53239927 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Coliform, fecal general
8% over limit
Discharged 280 MPN/100mL against a permitted limit of 260 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.3 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
0% over limit
Discharged 62.65199947 kg/d against a permitted limit of 715.50399399 kg/d (WKLY AVG)
DMR, Limited - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 2.9 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 2.8 MGD against a permitted limit of 4.2 MGD (ROLL AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.2 SU against a permitted limit of 8.5 SU (MAXIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 137.28959885 kg/d against a permitted limit of 477.15399599 kg/d (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.5 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
BOD, 5-day, percent removal
0% over limit
Discharged 95.4 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.2 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 20 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 5 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 209.1 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 7 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 9.7 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 8.1 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 4.52 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Enterococci
0% over limit
Discharged 15 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 288.74399757 kg/d against a permitted limit of 715.50399399 kg/d (WKLY AVG)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 98.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 24 MPN/100mL against a permitted limit of 260 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 3.91 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Coliform, fecal general
0% over limit
Discharged 2.4 MPN/100mL against a permitted limit of 88 MPN/100mL (MO GEO)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 148 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Enterococci
0% over limit
Discharged 41 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Nitrite + Nitrate total [as N]
0% over limit
Discharged 4.6 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 30.55419974 kg/d against a permitted limit of 477.15399599 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 2.1 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 7.2 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 20 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 5 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Overdue
Nitrogen, Kjeldahl, total [as N]
0% over limit
Discharged 4.3 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0.07 mg/L against a permitted limit of 0.12 mg/L (MO AVG)
DMR, Limited - Overdue
March 31, 2025
Enterococci
29% over limit
Discharged 134 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Chlorine, total residual
176% over limit
Discharged 0.58 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
20% over limit
Discharged 42 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Enterococci
223% over limit
Discharged 336 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Chlorine, total residual
129% over limit
Discharged 0.48 mg/L against a permitted limit of 0.21 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
300% over limit
Discharged 416 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
3% over limit
Discharged 36 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
December 31, 2024
Enterococci
371% over limit
Discharged 165 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEO)
DMR, Limited - Numeric Violation
Enterococci
906% over limit
Discharged 1046 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, total [as N]
55% over limit
Discharged 123.48799896 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Enterococci
5% over limit
Discharged 109 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
81% over limit
Discharged 143.73639879 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, total [as N]
100% over limit
Discharged 158.85459867 kg/d against a permitted limit of 79.44999933 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Enterococci
1256% over limit
Discharged 1410 MPN/100mL against a permitted limit of 104 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)