SOMERSVILLE WPCF
NPDES ID: CT0101605
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
This quarter: 4 effluent violations.
Violations
May 31, 2026
E. coli
682% over limit
Discharged 985.92 MPN/100mL against a permitted limit of 126 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
E. coli
385% over limit
Discharged 1990 MPN/100mL against a permitted limit of 410 MPN/100mL (MAXIMUM)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
25% over limit
Discharged 25 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
50% over limit
Discharged 85 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
March 31, 2026
Solids, suspended percent removal
230% over limit
Discharged 67 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
60% over limit
Discharged 84 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
170% over limit
Discharged 54 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
120% over limit
Discharged 66 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 44 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
110% over limit
Discharged 79 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
70% over limit
Discharged 83 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
Solids, total suspended
75% over limit
Discharged 35 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, suspended percent removal
60% over limit
Discharged 84 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
Solids, total suspended
95% over limit
Discharged 39 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
170% over limit
Discharged 73 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
227% over limit
Discharged 98 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
385% over limit
Discharged 97 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, 5-day, 20 deg. C
167% over limit
Discharged 80 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
40% over limit
Discharged 86 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
185% over limit
Discharged 57 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
75% over limit
Discharged 35 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
NOAEL Static 48Hr Acute Pimephales promelas
100% over limit
Discharged 0 % against a permitted limit of 90 % (DAILY MN)
DMR, Limited - Numeric Violation
Solids, total suspended
30% over limit
Discharged 39 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
90% over limit
Discharged 81 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, total suspended
23% over limit
Discharged 37 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
70% over limit
Discharged 83 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
Solids, total suspended
65% over limit
Discharged 33 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13% over limit
Discharged 34 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
50% over limit
Discharged 85 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
68% over limit
Discharged 33.5 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
55% over limit
Discharged 31 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Solids, suspended percent removal
50% over limit
Discharged 85 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
97% over limit
Discharged 59 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli
144% over limit
Discharged 307 MPN/100mL against a permitted limit of 126 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
E. coli
490% over limit
Discharged 2420 MPN/100mL against a permitted limit of 410 MPN/100mL (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
123% over limit
Discharged 44.5 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
40% over limit
Discharged 86 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
June 30, 2025
Solids, total suspended
63% over limit
Discharged 49 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
10% over limit
Discharged 89 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
NOAEL Static 48Hr Acute Pimephales promelas
9% over limit
Discharged 82 % against a permitted limit of 90 % (DAILY MN)
DMR, Limited - Numeric Violation
Solids, total suspended
105% over limit
Discharged 41 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
220% over limit
Discharged 68 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
20% over limit
Discharged 24 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
10% over limit
Discharged 22 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
20% over limit
Discharged 24 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 31 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
95% over limit
Discharged 39 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
37% over limit
Discharged 41 mg/L against a permitted limit of 30 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
40% over limit
Discharged 86 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
Solids, total suspended
75% over limit
Discharged 35 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
170% over limit
Discharged 73 % against a permitted limit of 90 % (MN % RMV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)