PONTIAC WWTP, CITY OF
NPDES ID: IL0030457
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: 3 effluent violations.
Violations
May 31, 2026
Nitrite + Nitrate total [as N]
74% over limit
Discharged 17.38 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrite + Nitrate total [as N]
48% over limit
Discharged 14.83 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrite + Nitrate total [as N]
141% over limit
Discharged 24.1 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrite + Nitrate total [as N]
224% over limit
Discharged 32.35 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrite + Nitrate total [as N]
169% over limit
Discharged 26.9 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrite + Nitrate total [as N]
134% over limit
Discharged 23.44 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrite + Nitrate total [as N]
203% over limit
Discharged 30.3 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrite + Nitrate total [as N]
153% over limit
Discharged 25.33 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrite + Nitrate total [as N]
139% over limit
Discharged 23.9 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrite + Nitrate total [as N]
107% over limit
Discharged 20.74 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrite + Nitrate total [as N]
111% over limit
Discharged 21.1 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrite + Nitrate total [as N]
61% over limit
Discharged 16.1 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrite + Nitrate total [as N]
67% over limit
Discharged 16.7 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrite + Nitrate total [as N]
67% over limit
Discharged 16.7 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrite + Nitrate total [as N]
52% over limit
Discharged 15.2 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrite + Nitrate total [as N]
171% over limit
Discharged 27.1 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrite + Nitrate total [as N]
145% over limit
Discharged 24.5 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
3% over limit
Discharged 24.8 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)