LAUREL, CITY OF STP
NPDES ID: IA0072214
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: 8 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
9% over limit
Discharged 0.54186352 kg/d against a permitted limit of 0.4994 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
27% over limit
Discharged 1.15420328 kg/d against a permitted limit of 0.90799999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
167% over limit
Discharged 8.8 mg/L against a permitted limit of 3.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
174% over limit
Discharged 4.925 mg/L against a permitted limit of 1.8 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
628% over limit
Discharged 9.57914568 kg/d against a permitted limit of 1.31659999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
948% over limit
Discharged 16.76 mg/L against a permitted limit of 1.6 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
846% over limit
Discharged 3.86455602 kg/d against a permitted limit of 0.4086 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
494% over limit
Discharged 28.5 mg/L against a permitted limit of 4.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
150% over limit
Discharged 2.38122408 kg/d against a permitted limit of 0.95339999 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
679% over limit
Discharged 26.5 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
155% over limit
Discharged 2.77828294 kg/d against a permitted limit of 1.08959999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
631% over limit
Discharged 28.5 mg/L against a permitted limit of 3.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, ammonia total [as N]
52% over limit
Discharged 1.65202608 kg/d against a permitted limit of 1.08959999 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
442% over limit
Discharged 21.675 mg/L against a permitted limit of 4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
207% over limit
Discharged 26.1 mg/L against a permitted limit of 8.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
300% over limit
Discharged 13.6 mg/L against a permitted limit of 3.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
29% over limit
Discharged 1.2297221 kg/d against a permitted limit of 0.95339999 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
6% over limit
Discharged 1.15731591 kg/d against a permitted limit of 1.08959999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
292% over limit
Discharged 9.8 mg/L against a permitted limit of 2.5 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
244% over limit
Discharged 13.4 mg/L against a permitted limit of 3.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 0.79224952 kg/d against a permitted limit of 0.68099999 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 1.225 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]
2% over limit
Discharged 1.0225 mg/L against a permitted limit of 1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
E. coli
1681% over limit
Discharged 2244.006 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
306% over limit
Discharged 13.4 mg/L against a permitted limit of 3.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
191% over limit
Discharged 2.64362246 kg/d against a permitted limit of 0.90799999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
439% over limit
Discharged 1.4687481 kg/d against a permitted limit of 0.2724 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
610% over limit
Discharged 7.1 mg/L against a permitted limit of 1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
356% over limit
Discharged 1.65593048 kg/d against a permitted limit of 0.3632 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
572% over limit
Discharged 6.10173271 kg/d against a permitted limit of 0.90799999 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
266% over limit
Discharged 5.125 mg/L against a permitted limit of 1.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
336% over limit
Discharged 14.4 mg/L against a permitted limit of 3.3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)