DANVILLE CITY OF STP
NPDES ID: IA0025861
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: 7 effluent violations.
Violations
May 31, 2026
Oxygen, dissolved [DO]
86% over limit
Discharged 0.7 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
582% over limit
Discharged 11.6 mg/L against a permitted limit of 1.7 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
263% over limit
Discharged 11.6 mg/L against a permitted limit of 3.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
12% over limit
Discharged 5.25 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.7 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
89% over limit
Discharged 2.8325 mg/L against a permitted limit of 1.5 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
88% over limit
Discharged 0.6 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
223% over limit
Discharged 12.6 mg/L against a permitted limit of 3.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
126% over limit
Discharged 7.668 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
88% over limit
Discharged 0.6 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.7 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Oxygen, dissolved [DO]
64% over limit
Discharged 1.8 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
328% over limit
Discharged 17.1 mg/L against a permitted limit of 4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
144% over limit
Discharged 20.5 mg/L against a permitted limit of 8.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Oxygen, dissolved [DO]
48% over limit
Discharged 2.6 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
452% over limit
Discharged 18.775 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1% over limit
Discharged 20 mg/L against a permitted limit of 19.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
687% over limit
Discharged 19.68 mg/L against a permitted limit of 2.5 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
72% over limit
Discharged 1.4 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
518% over limit
Discharged 24.1 mg/L against a permitted limit of 3.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
496% over limit
Discharged 16.1 mg/L against a permitted limit of 2.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
72% over limit
Discharged 1.4 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
561% over limit
Discharged 15.2 mg/L against a permitted limit of 2.3 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Oxygen, dissolved [DO]
87% over limit
Discharged 0.65 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
333% over limit
Discharged 11.7 mg/L against a permitted limit of 2.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
361% over limit
Discharged 7.3775 mg/L against a permitted limit of 1.6 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
82% over limit
Discharged 0.9 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
59% over limit
Discharged 4.3 mg/L against a permitted limit of 2.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
98% over limit
Discharged 2.178 mg/L against a permitted limit of 1.1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
7% over limit
Discharged 2.88 mg/L against a permitted limit of 2.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
49% over limit
Discharged 1.4875 mg/L against a permitted limit of 1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
62% over limit
Discharged 1.9 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
30% over limit
Discharged 4.17 mg/L against a permitted limit of 3.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
227% over limit
Discharged 3.268 mg/L against a permitted limit of 1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
56% over limit
Discharged 2.2 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
June 30, 2025
Oxygen, dissolved [DO]
74% over limit
Discharged 1.3 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
392% over limit
Discharged 6.4 mg/L against a permitted limit of 1.3 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
222% over limit
Discharged 10.3 mg/L against a permitted limit of 3.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Oxygen, dissolved [DO]
34% over limit
Discharged 3.3 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
April 30, 2025
Oxygen, dissolved [DO]
10% over limit
Discharged 4.5 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 5.6 mg/L against a permitted limit of 4.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
28% over limit
Discharged 15.63501531 kg/d against a permitted limit of 12.2125999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
205% over limit
Discharged 11.9 mg/L against a permitted limit of 3.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
68% over limit
Discharged 5.72 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
237% over limit
Discharged 13.4925 mg/L against a permitted limit of 4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
112% over limit
Discharged 17.8 mg/L against a permitted limit of 8.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
119% over limit
Discharged 7.4325 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
pH
0% over limit
Discharged 9.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
36% over limit
Discharged 5.3 mg/L against a permitted limit of 3.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
E. coli
284% over limit
Discharged 2420 MPN/100mL against a permitted limit of 630 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
October 31, 2024
Oxygen, dissolved [DO]
40% over limit
Discharged 3 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
September 30, 2024
Oxygen, dissolved [DO]
64% over limit
Discharged 1.8 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
August 31, 2024
Oxygen, dissolved [DO]
26% over limit
Discharged 3.7 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.6 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2024
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
38% over limit
Discharged 3.1 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)