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Sewage treatment plant, major discharger, Tahlequah, Oklahoma. NPDES permit OK0026964 expired Jun 30, 2010; its limits still apply. Last 12 months: over a limit 13 times (last September 2026), 4 of 20 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| October 2025 | Coliform, total general, daily maximum | 34658 #/100mL | ≤ 20000 #/100mL | 73% |
| October 2025 | Coliform, total general, geometric mean | 11711 #/100mL | ≤ 5000 #/100mL | 134% |
| November 2025 | Coliform, total general, daily maximum | 241960 #/100mL | ≤ 20000 #/100mL | 1110% |
| November 2025 | Coliform, total general, geometric mean | 106400 #/100mL | ≤ 5000 #/100mL | 2028% |
| November 2025 | Solids, total suspended, monthly average | 13 mg/L | ≤ 11 mg/L | 18% |
| December 2025 | Phosphorus, total [as P], monthly average | 1.1 mg/L | ≤ 1 mg/L | 10% |
| December 2025 | Solids, total suspended, monthly average | 21.2 mg/L | ≤ 11 mg/L | 93% |
| December 2025 | Solids, total suspended, weekly average | 21.2 mg/L | ≤ 16.5 mg/L | 28% |
| February 2026 | Solids, total suspended, monthly average | 19.2 mg/L | ≤ 11 mg/L | 75% |
| February 2026 | Solids, total suspended, weekly average | 19.2 mg/L | ≤ 16.5 mg/L | 16% |
| April 2026 | Phosphorus, total [as P], monthly average | 1.14 mg/L | ≤ 1 mg/L | 14% |
| September 2026 | Phosphorus, total [as P], monthly average | 1.37 mg/L | ≤ 1 mg/L | 37% |
| September 2026 | Phosphorus, total [as P], weekly average | 2.28 mg/L | ≤ 1.5 mg/L | 52% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Oxygen, dissolved [DO] | monthly average minimum | ≥ 7 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 7.6 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 11.4 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 334 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 | ≤ 11 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 16.5 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 483.5 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 1.5 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | weekly average | ≤ 2.25 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 65.9 lb/d | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | 001 |
| Phosphorus, total [as P] | weekly average | ≤ 1.5 mg/L | all year | 001 |
| Phosphorus, total [as P] | monthly average | ≤ 44 lb/d | all year | 001 |
| Lindane | monthly average | ≤ .08 ug/L | all year | 001 |
| Lindane | daily maximum | ≤ .12 ug/L | all year | 001 |
| Lindane | monthly average | ≤ 3.52 lb/d | all year | 001 |
| Flow, in conduit or thru treatment plant | 30-day average | report only (MGD) | all year | 001 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 001 |
| Coliform, fecal general | geometric mean | ≤ 200 #/100mL | May–Sep | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | May–Sep | 001 |
| Coliform, total general | geometric mean | ≤ 5000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Coliform, total general | daily maximum | ≤ 20000 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Polychlorinated biphenyls [PCBs] | annual maximum | ≤ 49.99 mg/kg | all year | SLD |
| 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 |
| 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 |
| 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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Your permit document is the final word. As JSON: /api/v1/permits/OK0026964 · MCP: https://passage-data.com/mcp