MCALESTER, CITY OF - WEST PLANT
NPDES ID: OK0026093
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, 4 compliance schedule violations.
Violations
June 30, 2026
Oxygen, dissolved [DO]
4% over limit
Discharged 4.8 mg/L against a permitted limit of 5 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
8% over limit
Discharged 0.0051 mg/L against a permitted limit of 0.00474 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
320% over limit
Discharged 0.0345 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Selenium, total [as Se]
30% over limit
Discharged 0.0107 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
5% over limit
Discharged 0.00496 mg/L against a permitted limit of 0.00474 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total dissolved- 180 deg. C
3% over limit
Discharged 1458 mg/L against a permitted limit of 1414 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Selenium, total [as Se]
47% over limit
Discharged 0.0121 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
54% over limit
Discharged 0.0272 mg/L against a permitted limit of 0.01761 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
27% over limit
Discharged 0.00602 mg/L against a permitted limit of 0.00474 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Selenium, total [as Se]
5% over limit
Discharged 0.00496 mg/L against a permitted limit of 0.00474 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
35% over limit
Discharged 0.0111 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
40% over limit
Discharged 13.8 mg/L against a permitted limit of 9.86 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
66% over limit
Discharged 0.0136 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.2 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
7% over limit
Discharged 5.6 mg/L against a permitted limit of 6 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
22% over limit
Discharged 5.05 mg/L against a permitted limit of 4.14 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Selenium, total [as Se]
35% over limit
Discharged 0.00642 mg/L against a permitted limit of 0.00474 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
35% over limit
Discharged 25.52841979 kg/d against a permitted limit of 18.9318 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
224% over limit
Discharged 6.49 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
367% over limit
Discharged 14 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Selenium, total [as Se]
7% over limit
Discharged 0.0088 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
271% over limit
Discharged 7.42 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
307% over limit
Discharged 12.2 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
153% over limit
Discharged 47.8425196 kg/d against a permitted limit of 18.9318 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
6% over limit
Discharged 20.13943983 kg/d against a permitted limit of 18.9318 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
106% over limit
Discharged 4.12 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
149% over limit
Discharged 7.46 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
8% over limit
Discharged 2.16 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
217% over limit
Discharged 9.5 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Cyanide, total [as CN]
31% over limit
Discharged 0.0231 mg/L against a permitted limit of 0.01761 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Selenium, total [as Se]
88% over limit
Discharged 0.0154 mg/L against a permitted limit of 0.00821 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
116% over limit
Discharged 0.0381 mg/L against a permitted limit of 0.01761 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total dissolved- 180 deg. C
11% over limit
Discharged 1568 mg/L against a permitted limit of 1414 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
25% over limit
Discharged 23.6397798 kg/d against a permitted limit of 18.9318 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
168% over limit
Discharged 8.04 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
237% over limit
Discharged 6.74 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
203% over limit
Discharged 6.05 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
173% over limit
Discharged 8.2 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
25% over limit
Discharged 23.6125398 kg/d against a permitted limit of 18.9318 kg/d (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
140% over limit
Discharged 7.2 mg/L against a permitted limit of 3 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
129% over limit
Discharged 4.58 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (4 hours ago)