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Sewage treatment plant, major discharger, Charleston, West Virginia. NPDES permit WV0050610, in force until May 18, 2031. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 20 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 40 mg/L | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 60 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 333.6 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 500.4 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 667.2 lb/d | May–Oct | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 1000.8 lb/d | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 500.4 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 1000.8 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 13 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 26 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 216.7 lb/d | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 433.7 lb/d | all year | 001 |
| Arsenic, total [as As] | monthly average | report only (mg/L) | all year | 001 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | monthly average | report only (mg/L) | all year | 001 |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year | 001 |
| Nickel, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Silver total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Silver total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Zinc, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Cadmium, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Cadmium, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Copper, total recoverable | daily maximum | 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 |
| Chlorine, total residual | monthly average | ≤ .028 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .057 mg/L | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | monthly average | report only (tox acute) | all year | 001 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | monthly average | report only (tox acute) | all year | 001 |
| Toxicity [acute], Pimephales promelas [Fathead Minnow] | daily maximum | report only (tox acute) | all year | 001 |
| Mercury, total [as Hg] | monthly average | report only (ug/L) | all year | 001 |
| Mercury, total [as Hg] | daily maximum | report only (ug/L) | all year | 001 |
| Coliform, fecal general | monthly geometric mean | ≤ 200 #/100mL | all year | 001 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| pH | instantaneous minimum | report only (SU) | all year | 003 |
| pH | instantaneous maximum | report only (SU) | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 003 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 003 |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) | all year | 003 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| pH | instantaneous minimum | report only (SU) | all year | 004 |
| pH | instantaneous maximum | report only (SU) | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 004 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 004 |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) | all year | 004 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 005 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 005 |
| pH | instantaneous minimum | report only (SU) | all year | 005 |
| pH | instantaneous maximum | report only (SU) | all year | 005 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 005 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 005 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 005 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 005 |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) | all year | 005 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 005 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 006 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 006 |
| pH | instantaneous minimum | report only (SU) | all year | 006 |
| pH | instantaneous maximum | report only (SU) | all year | 006 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 006 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 006 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | 006 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 006 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 006 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 006 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 006 |
| Coliform, fecal general | monthly geometric mean | report only (#/100mL) | all year | 006 |
| Coliform, fecal general | daily maximum | ≤ 400 #/100mL | all year | 006 |
| Flow rate | monthly average | report only (gal/d) | all year | IU01 |
| Flow rate | daily maximum | ≤ 1000 gal/d | all year | IU01 |
| pH | instantaneous minimum | ≥ 5 SU | all year | IU01 |
| pH | instantaneous maximum | ≤ 10 SU | all year | IU01 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | IU01 |
| Solids, total suspended | daily maximum | ≤ 130 mg/L | all year | IU01 |
| Oil and grease, hexane extr method | monthly average | report only (mg/L) | all year | IU01 |
| Oil and grease, hexane extr method | daily maximum | ≤ 30 mg/L | all year | IU01 |
| Flow rate | monthly average | report only (gal/d) | all year | IU02 |
| Flow rate | daily maximum | ≤ 2000 gal/d | all year | IU02 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | IU02 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 2500 mg/L | all year | IU02 |
| pH | instantaneous minimum | ≥ 5 SU | all year | IU02 |
| pH | instantaneous maximum | ≤ 10 SU | all year | IU02 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | IU02 |
| Solids, total suspended | daily maximum | ≤ 2000 mg/L | all year | IU02 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | all year | IU02 |
| Nitrogen, Kjeldahl, total [as N] | daily maximum | ≤ 450 mg/L | all year | IU02 |
Cited limits by parameter: West Virginia's rules and the federal ones.
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