ATWOOD STP, VILLAGE OF
NPDES ID: IL0025097
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: 6 effluent violations, 2 single-event violations.
Violations
May 31, 2026
Coliform, fecal general
2650% over limit
Discharged 11000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Solids, total suspended
125% over limit
Discharged 27 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
50% over limit
Discharged 6.54213995 kg/d against a permitted limit of 4.35839996 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
48% over limit
Discharged 33.59599972 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
65% over limit
Discharged 3.8 mg/L against a permitted limit of 2.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
88% over limit
Discharged 45 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
115% over limit
Discharged 2.791 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
21% over limit
Discharged 2.96189598 kg/d against a permitted limit of 2.45159998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
6% over limit
Discharged 24.0619998 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
79% over limit
Discharged 21.5 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
92% over limit
Discharged 46 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Coliform, fecal general
4900% over limit
Discharged 20000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
154% over limit
Discharged 5.85 mg/L against a permitted limit of 2.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
77% over limit
Discharged 7.72707994 kg/d against a permitted limit of 4.35839996 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
33% over limit
Discharged 60.38199949 kg/d against a permitted limit of 45.39999962 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
83% over limit
Discharged 22 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 29 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
43% over limit
Discharged 17.2 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Solids, total suspended
328% over limit
Discharged 51.3 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
302% over limit
Discharged 13.27 mg/L against a permitted limit of 3.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
296% over limit
Discharged 95 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
32% over limit
Discharged 10.75979991 kg/d against a permitted limit of 8.17199993 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
523% over limit
Discharged 27.4 mg/L against a permitted limit of 4.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
8% over limit
Discharged 6.85539994 kg/d against a permitted limit of 6.35599995 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
313% over limit
Discharged 99 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
433% over limit
Discharged 64 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
548% over limit
Discharged 21.4 mg/L against a permitted limit of 3.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
90% over limit
Discharged 19 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
459% over limit
Discharged 24.6 mg/L against a permitted limit of 4.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 10.30579991 kg/d against a permitted limit of 8.17199993 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
750% over limit
Discharged 204 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 120 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Oxygen, dissolved [DO]
35% over limit
Discharged 2.27 mg/L against a permitted limit of 3.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
60% over limit
Discharged 16 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.064 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
34% over limit
Discharged 30.41799974 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
833% over limit
Discharged 112 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
28% over limit
Discharged 58.11199951 kg/d against a permitted limit of 45.39999962 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.0977 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 64 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
604% over limit
Discharged 16.2 mg/L against a permitted limit of 2.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
936% over limit
Discharged 12.428 mg/L against a permitted limit of 1.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
22% over limit
Discharged 4.29 mg/L against a permitted limit of 5.5 mg/L (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 3.34870397 kg/d against a permitted limit of 2.26999998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
5% over limit
Discharged 4.58539996 kg/d against a permitted limit of 4.35839996 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
172% over limit
Discharged 3.268 mg/L against a permitted limit of 1.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
20% over limit
Discharged 2.8 mg/L against a permitted limit of 3.5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
93% over limit
Discharged 4.45 mg/L against a permitted limit of 2.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
617% over limit
Discharged 172 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
34% over limit
Discharged 30.41799974 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
20% over limit
Discharged 12 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
13% over limit
Discharged 4.8 mg/L against a permitted limit of 5.5 mg/L (MO AV MN)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
30% over limit
Discharged 2.8 mg/L against a permitted limit of 4 mg/L (MN WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
1067% over limit
Discharged 140 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, total suspended
27% over limit
Discharged 57 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
53% over limit
Discharged 46 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
8025% over limit
Discharged 32500 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
pH
0% over limit
Discharged 9.7 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Solids, total suspended
20% over limit
Discharged 54 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
3550% over limit
Discharged 14600 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
80% over limit
Discharged 54 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Coliform, fecal general
400% over limit
Discharged 2000 MPN/100mL against a permitted limit of 400 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)