LEAF RIVER - WWTP
NPDES ID: IL0029475
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: 11 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
7% over limit
Discharged 2.46612798 kg/d against a permitted limit of 2.31539998 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
280% over limit
Discharged 16.7 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
255% over limit
Discharged 16.7 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
159% over limit
Discharged 2.46612798 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
828% over limit
Discharged 16.7 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
268% over limit
Discharged 16.2 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
183% over limit
Discharged 2.69902998 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
17% over limit
Discharged 2.69902998 kg/d against a permitted limit of 2.31539998 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
8% over limit
Discharged 2.69902998 kg/d against a permitted limit of 2.49699998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
800% over limit
Discharged 16.2 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
245% over limit
Discharged 16.2 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
409% over limit
Discharged 23.9 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
13% over limit
Discharged 2.62411998 kg/d against a permitted limit of 2.31539998 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
175% over limit
Discharged 2.62411998 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1228% over limit
Discharged 23.9 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
5% over limit
Discharged 2.62411998 kg/d against a permitted limit of 2.49699998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
443% over limit
Discharged 23.9 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
465% over limit
Discharged 32.2 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
53% over limit
Discharged 3.41362597 kg/d against a permitted limit of 2.22459998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
12% over limit
Discharged 3.41362597 kg/d against a permitted limit of 3.04179997 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
667% over limit
Discharged 32.2 mg/L against a permitted limit of 4.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
291% over limit
Discharged 22.3 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
431% over limit
Discharged 22.3 mg/L against a permitted limit of 4.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
14% over limit
Discharged 2.53286598 kg/d against a permitted limit of 2.22459998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
123% over limit
Discharged 12.7 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
202% over limit
Discharged 12.7 mg/L against a permitted limit of 4.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
212% over limit
Discharged 17.8 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
324% over limit
Discharged 17.8 mg/L against a permitted limit of 4.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
182% over limit
Discharged 2.68767998 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 2.68767998 kg/d against a permitted limit of 2.31539998 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
839% over limit
Discharged 16.9 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
8% over limit
Discharged 2.68767998 kg/d against a permitted limit of 2.49699998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
284% over limit
Discharged 16.9 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
260% over limit
Discharged 16.9 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
31% over limit
Discharged 1.25122399 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
348% over limit
Discharged 8.06 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
71% over limit
Discharged 8.06 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
22% over limit
Discharged 3.5 mg/L against a permitted limit of 4.5 mg/L (MN WK AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
13% over limit
Discharged 3.5 mg/L against a permitted limit of 4 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
83% over limit
Discharged 8.06 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
42% over limit
Discharged 3.5 mg/L against a permitted limit of 6 mg/L (MO AV MN)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
61% over limit
Discharged 11.4 mg/L against a permitted limit of 7.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
35% over limit
Discharged 2.6 mg/L against a permitted limit of 4 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
57% over limit
Discharged 2.6 mg/L against a permitted limit of 6 mg/L (MO AV MN)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
42% over limit
Discharged 2.6 mg/L against a permitted limit of 4.5 mg/L (MN WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
200% over limit
Discharged 11.4 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
106% over limit
Discharged 1.68343199 kg/d against a permitted limit of 0.81719999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
660% over limit
Discharged 11.4 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
106% over limit
Discharged 14.6 mg/L against a permitted limit of 7.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
137% over limit
Discharged 1.93494798 kg/d against a permitted limit of 0.81719999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
28% over limit
Discharged 3.61 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
284% over limit
Discharged 14.6 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
873% over limit
Discharged 14.6 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
42% over limit
Discharged 3.61 mg/L against a permitted limit of 6.25 mg/L (MN WK AV)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
34% over limit
Discharged 5.1 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
240% over limit
Discharged 5.1 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
170% over limit
Discharged 2.57417998 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
844% over limit
Discharged 17 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
262% over limit
Discharged 17 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
11% over limit
Discharged 2.57417998 kg/d against a permitted limit of 2.31539998 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 2.57417998 kg/d against a permitted limit of 2.49699998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
286% over limit
Discharged 17 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
189% over limit
Discharged 5.2 mg/L against a permitted limit of 1.8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
11% over limit
Discharged 5.2 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
18% over limit
Discharged 5.2 mg/L against a permitted limit of 4.4 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
111% over limit
Discharged 12 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
186% over limit
Discharged 12 mg/L against a permitted limit of 4.2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
20% over limit
Discharged 1.8 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)