OK CITY WTR UTIL TRST-CHISHOLM
NPDES ID: OK0027553
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: 9 effluent violations.
Violations
June 30, 2026
BOD, carbonaceous [5 day, 20 C]
78% over limit
Discharged 16 mg/L against a permitted limit of 9 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
50% over limit
Discharged 9 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2026
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 12 mg/L against a permitted limit of 9 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
67% over limit
Discharged 10 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, nitrate total [as N]
2% over limit
Discharged 13.68 mg/L against a permitted limit of 13.39 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
176% over limit
Discharged 1120 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, carbonaceous [5 day, 20 C]
34% over limit
Discharged 12.1 mg/L against a permitted limit of 9 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, nitrate total [as N]
3% over limit
Discharged 13.8 mg/L against a permitted limit of 13.39 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
63% over limit
Discharged 9.8 mg/L against a permitted limit of 6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 12 mg/L against a permitted limit of 9 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, carbonaceous [5 day, 20 C]
11% over limit
Discharged 10 mg/L against a permitted limit of 9 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
E. coli
44% over limit
Discharged 583 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
BOD, carbonaceous [5 day, 20 C]
33% over limit
Discharged 12 mg/L against a permitted limit of 9 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
5% over limit
Discharged 39.77039967 kg/d against a permitted limit of 37.86359968 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli
265% over limit
Discharged 1483 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
E. coli
135% over limit
Discharged 956 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2025
Oxygen, dissolved [DO]
9% over limit
Discharged 6.4 mg/L against a permitted limit of 7 mg/L (INST MIN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (5 hours ago)