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Sewage treatment plant, major discharger, Mcalester, Oklahoma. NPDES permit OK0026093 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 23 times (last August 2026), 3 of 19 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Nitrogen, ammonia total [as N], monthly average | < 56.23 lb/d | ≤ 41.7 lb/d | 35% |
| October 2025 | Nitrogen, ammonia total [as N], monthly average | < 6.49 mg/L | ≤ 2 mg/L | 224% |
| October 2025 | Nitrogen, ammonia total [as N], weekly average | 14 mg/L | ≤ 3 mg/L | 367% |
| December 2025 | Nitrogen, ammonia total [as N], daily maximum | 13.8 mg/L | ≤ 9.86 mg/L | 40% |
| December 2025 | Nitrogen, ammonia total [as N], monthly average | < 5.05 mg/L | ≤ 4.14 mg/L | 22% |
| December 2025 | Oxygen, dissolved [DO], minimum | 5.6 mg/L | ≥ 6 mg/L | 7% |
| December 2025 | Selenium, total [as Se], daily maximum | 13.6 ug/L | ≤ 8.21 ug/L | 66% |
| December 2025 | Selenium, total [as Se], monthly average | 6.42 ug/L | ≤ 4.74 ug/L | 35% |
| December 2025 | pH, minimum | 6.2 SU | ≥ 6.5 SU | — |
| January 2026 | Selenium, total [as Se], daily maximum | 11.1 ug/L | ≤ 8.21 ug/L | 35% |
| January 2026 | Selenium, total [as Se], monthly average | 4.96 ug/L | ≤ 4.74 ug/L | 5% |
| February 2026 | Cyanide, total [as CN], daily maximum | 27.2 ug/L | ≤ 17.61 ug/L | 54% |
| February 2026 | Selenium, total [as Se], daily maximum | 12.1 ug/L | ≤ 8.21 ug/L | 47% |
| February 2026 | Selenium, total [as Se], monthly average | 6.02 ug/L | ≤ 4.74 ug/L | 27% |
| March 2026 | Selenium, total [as Se], daily maximum | 10.7 ug/L | ≤ 8.21 ug/L | 30% |
| March 2026 | Selenium, total [as Se], monthly average | 4.96 ug/L | ≤ 4.74 ug/L | 5% |
| March 2026 | Solids, total dissolved- 180 deg. C, daily maximum | 1458 mg/L | ≤ 1414 mg/L | 3% |
| June 2026 | Oxygen, dissolved [DO], minimum | 4.8 mg/L | ≥ 5 mg/L | 4% |
| June 2026 | Selenium, total [as Se], daily maximum | 34.5 ug/L | ≤ 8.21 ug/L | 320% |
| June 2026 | Selenium, total [as Se], monthly average | 5.1 ug/L | ≤ 4.74 ug/L | 8% |
| July 2026 | Cyanide, total [as CN], daily maximum | 26.7 ug/L | ≤ 17.61 ug/L | 52% |
| August 2026 | Nitrogen, ammonia total [as N], monthly average | 2.37 mg/L | ≤ 2 mg/L | 19% |
| August 2026 | Nitrogen, ammonia total [as N], weekly average | 3.16 mg/L | ≤ 3 mg/L | 5% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | minimum | ≥ 5 mg/L | Jun–Oct | 001 |
| Oxygen, dissolved [DO] | minimum | ≥ 6 mg/L | Jan, Feb, Mar, Apr, May, Nov, Dec | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 25 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 15 mg/L | Apr–Oct | 001 |
| Solids, total suspended | weekly average | ≤ 37.5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | weekly average | ≤ 22.5 mg/L | Apr–Oct | 001 |
| Solids, total suspended | monthly average | ≤ 521.3 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Solids, total suspended | monthly average | ≤ 312.8 lb/d | Apr–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 3 mg/L | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 4.14 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 4.5 mg/L | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 9.86 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 3 mg/L | Jun–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 62.5 lb/d | Apr, May | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 86.33 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 41.7 lb/d | Jun–Oct | 001 |
| Cyanide, total [as CN] | monthly average | ≤ 10.16 ug/L | all year | 001 |
| Cyanide, total [as CN] | daily maximum | ≤ 17.61 ug/L | all year | 001 |
| Cyanide, total [as CN] | monthly average | ≤ .2118 lb/d | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ 4.74 ug/L | all year | 001 |
| Selenium, total [as Se] | daily maximum | ≤ 8.21 ug/L | all year | 001 |
| Selenium, total [as Se] | monthly average | ≤ .0988 lb/d | all year | 001 |
| Gamma-BHC | monthly average | ≤ .08 ug/L | all year | 001 |
| Gamma-BHC | daily maximum | ≤ .13 ug/L | all year | 001 |
| Gamma-BHC | monthly average | ≤ .00167 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | ≤ 1223 mg/L | all year | 001 |
| Solids, total dissolved- 180 deg. C | daily maximum | ≤ 1414 mg/L | all year | 001 |
| Solids, total dissolved- 180 deg. C | monthly average | ≤ 25495 lb/d | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 10 mg/L | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 15 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 15 mg/L | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 22.5 mg/L | Jan, Feb, Mar, Nov, Dec | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 208.5 lb/d | Apr–Oct | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 312.8 lb/d | Jan, Feb, Mar, Nov, Dec | 001 |
| Toxicity characteristic leaching procedure | monthly average minimum | report only (pass=0;fail=1) | all year | SLD |
| Ann. amt sludge disposed by other method | annual total | report only (DMT/y) | all year | SLD |
| Annual amt of sludge incinerated | annual total | report only (DMT/y) | all year | SLD |
| Annual sludge production, total | annual total | report only (DMT/y) | all year | SLD |
| Annual amount of sludge land applied | annual total | report only (DMT/y) | all year | SLD |
| Annual amt. sludge disposed surface unit | annual total | report only (DMT/y) | all year | SLD |
| Annual amt sludge disposed in landfill | annual total | report only (DMT/y) | all year | SLD |
| Annual amt sludge transported interstate | annual total | report only (DMT/y) | all year | SLD |
| Compliance w/part 258 sludge requirement | value | report only (N=0;Y=1) | all year | SLD |
| Arsenic, dry weight | single sample | report only (mg/kg) | all year | SLL |
| Arsenic, dry weight | maximum | ≤ 75 mg/kg | all year | SLL |
| Arsenic, dry weight | maximum value | ≤ 41 kg/ha | all year | SLL |
| Selenium, dry weight | single sample | report only (mg/kg) | all year | SLL |
| Selenium, dry weight | maximum | ≤ 100 mg/kg | all year | SLL |
| Selenium, dry weight | maximum value | ≤ 100 kg/ha | all year | SLL |
| Polychlorinated biphenyls [PCBs] | annual maximum | ≤ 49.99 mg/kg | all year | SLL |
| Copper, dry weight | single sample | report only (mg/kg) | all year | SLL |
| Copper, dry weight | maximum | ≤ 4300 mg/kg | all year | SLL |
| Copper, dry weight | maximum value | ≤ 1500 kg/ha | all year | SLL |
| Cadmium, dry weight | single sample | report only (mg/kg) | all year | SLL |
| Cadmium, dry weight | maximum | ≤ 85 mg/kg | all year | SLL |
| Cadmium, dry weight | maximum value | ≤ 39 kg/ha | all year | SLL |
| Annual whole sludge application rate | maximum value | report only (met t/ha/yr) | all year | SLL |
| Molybdenum, sludge, total, dry weight [as Mo] | single sample | report only (mg/kg) | all year | SLL |
| Molybdenum, sludge, total, dry weight [as Mo] | maximum | ≤ 75 mg/kg | all year | SLL |
| Molybdenum, sludge, total, dry weight [as Mo] | maximum value | report only (kg/ha) | all year | SLL |
| Zinc, sludge, total, dry weight [as Zn] | single sample | report only (mg/kg) | all year | SLL |
| Zinc, sludge, total, dry weight [as Zn] | maximum | ≤ 7500 mg/kg | all year | SLL |
| Zinc, sludge, total, dry weight [as Zn] | maximum value | ≤ 2800 kg/ha | all year | SLL |
| Lead, sludge, total, dry weight [as Pb] | single sample | report only (mg/kg) | all year | SLL |
| Lead, sludge, total, dry weight [as Pb] | maximum | ≤ 840 mg/kg | all year | SLL |
| Lead, sludge, total, dry weight [as Pb] | maximum value | ≤ 300 kg/ha | all year | SLL |
| Nickel, sludge, total, dry weight [as Ni] | single sample | report only (mg/kg) | all year | SLL |
| Nickel, sludge, total, dry weight [as Ni] | maximum | ≤ 420 mg/kg | all year | SLL |
| Nickel, sludge, total, dry weight [as Ni] | maximum value | ≤ 420 kg/ha | all year | SLL |
| Mercury, sludge, total, dry weight [as Hg] | single sample | report only (mg/kg) | all year | SLL |
| Mercury, sludge, total, dry weight [as Hg] | maximum | ≤ 57 mg/kg | all year | SLL |
| Mercury, sludge, total, dry weight [as Hg] | maximum value | ≤ 17 kg/ha | all year | SLL |
| Pollutant table from 503.13 | value | report only (table #) | all year | SLL |
| Level of pathogen requirements achieved | maximum value | report only (state class) | all year | SLL |
| Description of pathogen option used | value | report only (alt #) | all year | SLL |
| Vector attraction reduction alternative used | value | report only (alt #) | all year | SLL |
| Arsenic, dry weight | allowable concentration | report only (mg/kg) | all year | SLS |
| Arsenic, dry weight | single sample | report only (mg/kg) | all year | SLS |
| Unit w/liner/leachate collection system | value | report only (N=0;Y=1) | all year | SLS |
| Unit boundary to property line distance | value | report only (m) | all year | SLS |
| Nickel, sludge, total, dry weight [as Ni] | allowable concentration | report only (mg/kg) | all year | SLS |
| Nickel, sludge, total, dry weight [as Ni] | single sample | report only (mg/kg) | all year | SLS |
| Chromium, sludge, total, dry weight [as Cr] | allowable concentration | report only (mg/kg) | all year | SLS |
| Chromium, sludge, total, dry weight [as Cr] | single sample | report only (mg/kg) | all year | SLS |
| Level of pathogen requirements achieved | single sample | report only (state class) | all year | SLS |
| Description of pathogen option used | value | report only (alt #) | all year | SLS |
| Vector attraction reduction alternative used | value | report only (alt #) | all year | SLS |
| pH | daily minimum | report only (SU) | all year | TX1 |
| pH | daily maximum | report only (SU) | all year | TX1 |
| Nitrogen, ammonia total [as N] | daily minimum | report only (mg/L) | all year | TX1 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | TX1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | TX1 |
| Whole effluent toxicity - retest #1 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Whole effluent toxicity - retest #2 | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Solids, total dissolved- 180 deg. C | daily minimum | report only (mg/L) | all year | TX1 |
| Solids, total dissolved- 180 deg. C | monthly average | report only (mg/L) | all year | TX1 |
| Solids, total dissolved- 180 deg. C | daily maximum | report only (mg/L) | all year | TX1 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| %Mortality 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| %Mortality Static Renewal 7Day Chronic Pimephales Promelas | 7-day minimum | report only (%) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (pass=0;fail=1) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 7-day minimum | report only (%) | all year | TX1 |
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 7-day minimum | report only (%) | all year | TX1 |
Cited limits by parameter: Oklahoma's rules and the federal ones.
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