STIGLER MUNICIPAL IMPROVEMENT AUTHORITY
NPDES ID: OK0020711
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: 6 effluent violations.
Violations
May 31, 2026
BOD, carbonaceous [5 day, 20 C]
8678% over limit
Discharged 1580 mg/L against a permitted limit of 18 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
3325% over limit
Discharged 1121.24379058 kg/d against a permitted limit of 32.73339972 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6653% over limit
Discharged 810.3 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, carbonaceous [5 day, 20 C]
4356% over limit
Discharged 802 mg/L against a permitted limit of 18 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
2776% over limit
Discharged 941.50519209 kg/d against a permitted limit of 32.73339972 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
3730% over limit
Discharged 459.6 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
14933% over limit
Discharged 4510 mg/L against a permitted limit of 30 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
8836% over limit
Discharged 4872.60035906 kg/d against a permitted limit of 54.52539954 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
13650% over limit
Discharged 2750 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
BOD, 5-day, 20 deg. C
1941% over limit
Discharged 1113.07179065 kg/d against a permitted limit of 54.52539954 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
3939% over limit
Discharged 807.8 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
7000% over limit
Discharged 2130 mg/L against a permitted limit of 30 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
December 31, 2025
BOD, 5-day, 20 deg. C
540% over limit
Discharged 192 mg/L against a permitted limit of 30 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
80% over limit
Discharged 98.16387918 kg/d against a permitted limit of 54.52539954 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
234% over limit
Discharged 66.79 mg/L against a permitted limit of 20 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, carbonaceous [5 day, 20 C]
4836% over limit
Discharged 1075.57139096 kg/d against a permitted limit of 21.79199982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
12415% over limit
Discharged 1001.2 mg/L against a permitted limit of 8 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
23317% over limit
Discharged 2810 mg/L against a permitted limit of 12 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
May 31, 2025
E. coli
473% over limit
Discharged 722.3 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Solids, total suspended
352% over limit
Discharged 184.73259845 kg/d against a permitted limit of 40.90539966 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
602% over limit
Discharged 158 mg/L against a permitted limit of 22.5 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
E. coli
1402% over limit
Discharged 6100 MPN/100mL against a permitted limit of 406 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
300% over limit
Discharged 60 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (12 hours ago)