NPDES ID: IL0022250
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: 5 effluent violations, 3 reporting violations.
Violations
May 31, 2026
Chlorine, total residual
20% over limit
Discharged 0.06 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Oxygen, dissolved [DO]
88% over limit
Discharged 0.62 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
1800% over limit
Discharged 190 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
850% over limit
Discharged 190 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
90% over limit
Discharged 0.62 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Numeric Violation
March 31, 2026
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
80% over limit
Discharged 18 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Overdue
December 31, 2025
Chlorine, total residual
240% over limit
Discharged 0.17 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Chlorine, total residual
300% over limit
Discharged 0.2 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Chlorine, total residual
1880% over limit
Discharged 0.99 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Chlorine, total residual
900% over limit
Discharged 0.5 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Chlorine, total residual
380% over limit
Discharged 0.24 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.188 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.02 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 0.171 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Chlorine, total residual
1140% over limit
Discharged 0.62 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
1140% over limit
Discharged 0.62 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 85 deg F against a permitted limit of 93 deg F (MO MAX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.2 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 10 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 1 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0.66737999 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 10 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.2 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
June 30, 2025
Temperature, water deg. fahrenheit
0% over limit
Discharged 82 deg F against a permitted limit of 93 deg F (MO MAX)
DMR, Limited - Overdue
Chlorine, total residual
740% over limit
Discharged 0.42 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
740% over limit
Discharged 0.42 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
7% over limit
Discharged 5.6 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
7% over limit
Discharged 5.6 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 5.6 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.21 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.21 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.02 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 4 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.08 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 0.064 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
May 31, 2025
Temperature, water deg. fahrenheit
0% over limit
Discharged 70 deg F against a permitted limit of 93 deg F (MO MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.455 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Chlorine, total residual
1120% over limit
Discharged 0.61 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
1120% over limit
Discharged 0.61 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
0% over limit
Discharged 9.9 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.38 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.38 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.37 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.029 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 9.9 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Overdue
April 30, 2025
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0 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 0 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 84 deg F against a permitted limit of 93 deg F (MO MAX)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.309 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.415352 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
March 31, 2025
Temperature, water deg. fahrenheit
0% over limit
Discharged 60 deg F against a permitted limit of 63 deg F (MO MAX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.1402773 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.36 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 11 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Overdue
Chlorine, total residual
520% over limit
Discharged 0.31 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
520% over limit
Discharged 0.31 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
0% over limit
Discharged 11 mg/L against a permitted limit of 6 mg/L (MN WK AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.42631 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.02 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 8.36 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
February 28, 2025
Phosphorus, total [as P]
0% over limit
Discharged 0 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 0.266721 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 5.5 mg/L (MO AV MN)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 3.5 mg/L (DAILY MN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 0 deg F against a permitted limit of 63 deg F (MO MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.266721 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 4 mg/L (MN WK AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
January 31, 2025
Oxygen, dissolved [DO]
0% over limit
Discharged 9 mg/L against a permitted limit of 3.5 mg/L (DAILY MN)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.02 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 9 mg/L against a permitted limit of 5.5 mg/L (MO AV MN)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.489635 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 8.4 SU against a permitted limit of 6.5 SU (MO MIN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 4 mg/L against a permitted limit of 10 mg/L (30DA AVG)
DMR, Limited - Overdue
Temperature, water deg. fahrenheit
0% over limit
Discharged 60 deg F against a permitted limit of 63 deg F (MO MAX)
DMR, Limited - Overdue
Chlorine, total residual
1080% over limit
Discharged 0.59 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
1080% over limit
Discharged 0.59 mg/L against a permitted limit of 0.05 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 1.1 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 0.196536 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 8.4 SU against a permitted limit of 9 SU (MO MAX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 9 mg/L against a permitted limit of 4 mg/L (MN WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 12 mg/L (30DA AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)