WINNEBAGO WASTEWATER TREATMENT FACILITY
NPDES ID: NE0113212
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
Violations
February 28, 2026
BOD, 5-day, percent removal
40% over limit
Discharged 79 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
100% over limit
Discharged 70 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
33% over limit
Discharged 39.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Oxygen, dissolved [DO]
6% over limit
Discharged 4.7 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
October 31, 2025
Oxygen, dissolved [DO]
44% over limit
Discharged 2.8 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
14% over limit
Discharged 4.3 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
38% over limit
Discharged 14.2 mg/L against a permitted limit of 10.26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
83% over limit
Discharged 72.6 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
18% over limit
Discharged 35.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
71% over limit
Discharged 17.5 mg/L against a permitted limit of 10.26 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
24% over limit
Discharged 12.6 mg/L against a permitted limit of 10.16 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
12% over limit
Discharged 11.4 mg/L against a permitted limit of 10.16 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
BOD, 5-day, 20 deg. C
42% over limit
Discharged 42.6 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
280% over limit
Discharged 43 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
52% over limit
Discharged 25.9 mg/L against a permitted limit of 17.01 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
32% over limit
Discharged 3.4 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
155% over limit
Discharged 25.9 mg/L against a permitted limit of 10.16 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
BOD, 5-day, percent removal
69% over limit
Discharged 74.7 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
6% over limit
Discharged 31.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
213% over limit
Discharged 53 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
September 30, 2024
Oxygen, dissolved [DO]
48% over limit
Discharged 2.6 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
30% over limit
Discharged 3.5 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
July 31, 2024
Solids, total suspended
0% over limit
Discharged 172 mg/L against a permitted limit of 0 mg/L (AVERAGE)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 250 mg/L against a permitted limit of 0 mg/L (AVERAGE)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 2.27 SU against a permitted limit of 0 SU (AVERAGE)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.005329 MGD against a permitted limit of 0 MGD (AVERAGE)
DMR, Monitor Only - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)