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Sewage treatment plant, major discharger, Blackwell, Oklahoma. NPDES permit OK0031909, in force until Jun 30, 2029. Last 12 months: over a limit 6 times (last July 2026), 4 of 32 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | E. coli, daily maximum | 2340 MPN/100mL | ≤ 2030 MPN/100mL | 15% |
| May 2026 | E. coli, daily maximum | 2222 MPN/100mL | ≤ 406 MPN/100mL | 447% |
| June 2026 | E. coli, daily maximum | 2730 MPN/100mL | ≤ 406 MPN/100mL | 572% |
| June 2026 | Solids, total suspended, monthly average | 347.03 lb/d | ≤ 250.2 lb/d | 39% |
| July 2026 | E. coli, daily maximum | 2760 MPN/100mL | ≤ 406 MPN/100mL | 580% |
| July 2026 | E. coli, geometric mean | 381 MPN/100mL | ≤ 126 MPN/100mL | 202% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 250.2 lb/d | all year | 001 |
| pH | minimum | ≥ 6.5 SU | all year | 001 |
| pH | maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 250.2 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | weekly average | report only (mg/L) | 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 |
| E. coli | geometric mean | ≤ 126 MPN/100mL | May–Sep | 001 |
| E. coli | geometric mean | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 406 MPN/100mL | May–Sep | 001 |
| E. coli | daily maximum | ≤ 2030 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Thallium, total [as Tl] | monthly average | report only (ug/L) | all year | 999 |
| 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 |
| Whole effluent toxicity - retest #1 | 48-hour minimum | report only (pass=0;fail=1) | 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 | 48-hour 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 |
| Whole Effluent Toxicity [WET] - C. dubia | 7-day minimum | ≥ 16 % | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Daphnia pulex | 48-hour minimum | report only (%) | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (%) | 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 |
| LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 48-hour minimum | report only (pass=0;fail=1) | all year | TX1 |
| %Mortality Static Renewal 48Hr Acute Daphnia Pulex | 48-hour minimum | report only (%) | all year | TX1 |
| % Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C | 48-hour minimum | report only (%) | 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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Your permit document is the final word. As JSON: /api/v1/permits/OK0031909 · MCP: https://passage-data.com/mcp