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Bituminous Coal And Lignite - Surface, Ridgway, Pennsylvania. NPDES permit PA0104779, in force until Nov 12, 2028. Last 12 months: no values over a limit, 111 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year | 3TR |
| pH | instantaneous minimum | ≥ 6 SU | all year | 3TR |
| pH | instantaneous maximum | ≤ 9 SU | all year | 3TR |
| pH | instantaneous maximum | ≤ 9 SU | all year | 3TR |
| Alkalinity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | 3TR |
| Alkalinity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | 3TR |
| Acidity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | 3TR |
| Acidity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | 3TR |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | 3TR |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | 3TR |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 3TR |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 3TR |
| Solids, total suspended | instantaneous maximum | ≤ 90 mg/L | all year | 3TR |
| Solids, total suspended | instantaneous maximum | ≤ 90 mg/L | all year | 3TR |
| Iron, total [as Fe] | monthly average | ≤ 2.34 mg/L | all year | 3TR |
| Iron, total [as Fe] | monthly average | ≤ 2.34 mg/L | all year | 3TR |
| Iron, total [as Fe] | daily maximum | ≤ 4.68 mg/L | all year | 3TR |
| Iron, total [as Fe] | daily maximum | ≤ 4.68 mg/L | all year | 3TR |
| Iron, total [as Fe] | instantaneous maximum | ≤ 5.85 mg/L | all year | 3TR |
| Iron, total [as Fe] | instantaneous maximum | ≤ 5.85 mg/L | all year | 3TR |
| Manganese, total [as Mn] | monthly average | ≤ 2 mg/L | all year | 3TR |
| Manganese, total [as Mn] | monthly average | ≤ 2 mg/L | all year | 3TR |
| Manganese, total [as Mn] | daily maximum | ≤ 4 mg/L | all year | 3TR |
| Manganese, total [as Mn] | daily maximum | ≤ 4 mg/L | all year | 3TR |
| Manganese, total [as Mn] | instantaneous maximum | ≤ 5 mg/L | all year | 3TR |
| Manganese, total [as Mn] | instantaneous maximum | ≤ 5 mg/L | all year | 3TR |
| Aluminum, total [as Al] | monthly average | ≤ .75 mg/L | all year | 3TR |
| Aluminum, total [as Al] | monthly average | ≤ .75 mg/L | all year | 3TR |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | all year | 3TR |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | all year | 3TR |
| Aluminum, total [as Al] | instantaneous maximum | ≤ .75 mg/L | all year | 3TR |
| Aluminum, total [as Al] | instantaneous maximum | ≤ .75 mg/L | all year | 3TR |
| Flow, in conduit or thru treatment plant | instantaneous maximum | report only (gal/min) | all year | 3TR |
| Flow, in conduit or thru treatment plant | instantaneous maximum | report only (gal/min) | all year | 3TR |
| Alkalinity - Acidity [as CaCO3] | instantaneous minimum | ≥ 0 mg/L | all year | 3TR |
| Alkalinity - Acidity [as CaCO3] | instantaneous minimum | ≥ 0 mg/L | all year | 3TR |
| pH | instantaneous minimum | ≥ 6 SU | all year | T12 |
| pH | instantaneous minimum | ≥ 6 SU | all year | T12 |
| pH | instantaneous maximum | ≤ 9 SU | all year | T12 |
| pH | instantaneous maximum | ≤ 9 SU | all year | T12 |
| Alkalinity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | T12 |
| Alkalinity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | T12 |
| Acidity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | T12 |
| Acidity, total [as CaCO3] | instantaneous maximum | report only (mg/L) | all year | T12 |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | T12 |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | T12 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | T12 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | T12 |
| Solids, total suspended | instantaneous maximum | ≤ 90 mg/L | all year | T12 |
| Solids, total suspended | instantaneous maximum | ≤ 90 mg/L | all year | T12 |
| Iron, total [as Fe] | monthly average | ≤ 1.5 mg/L | all year | T12 |
| Iron, total [as Fe] | monthly average | ≤ 1.5 mg/L | all year | T12 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | T12 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | T12 |
| Iron, total [as Fe] | instantaneous maximum | ≤ 3.75 mg/L | all year | T12 |
| Iron, total [as Fe] | instantaneous maximum | ≤ 3.75 mg/L | all year | T12 |
| Manganese, total [as Mn] | monthly average | ≤ 1 mg/L | all year | T12 |
| Manganese, total [as Mn] | monthly average | ≤ 1 mg/L | all year | T12 |
| Manganese, total [as Mn] | daily maximum | ≤ 2 mg/L | all year | T12 |
| Manganese, total [as Mn] | daily maximum | ≤ 2 mg/L | all year | T12 |
| Manganese, total [as Mn] | instantaneous maximum | ≤ 2.5 mg/L | all year | T12 |
| Manganese, total [as Mn] | instantaneous maximum | ≤ 2.5 mg/L | all year | T12 |
| Aluminum, total [as Al] | monthly average | ≤ .75 mg/L | all year | T12 |
| Aluminum, total [as Al] | monthly average | ≤ .75 mg/L | all year | T12 |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | all year | T12 |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | all year | T12 |
| Aluminum, total [as Al] | instantaneous maximum | ≤ .75 mg/L | all year | T12 |
| Aluminum, total [as Al] | instantaneous maximum | ≤ .75 mg/L | all year | T12 |
| Flow, in conduit or thru treatment plant | instantaneous maximum | report only (gal/min) | all year | T12 |
| Flow, in conduit or thru treatment plant | instantaneous maximum | report only (gal/min) | all year | T12 |
| Alkalinity - Acidity [as CaCO3] | instantaneous minimum | ≥ 0 mg/L | all year | T12 |
| Alkalinity - Acidity [as CaCO3] | instantaneous minimum | ≥ 0 mg/L | all year | T12 |
| Osmotic pressure, total, unf whl wtr | instantaneous maximum | ≤ 50 mOsm/kg | all year | T12 |
| Osmotic pressure, total, unf whl wtr | instantaneous maximum | ≤ 50 mOsm/kg | all year | T12 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
Same industry: the 351 Coal Mining permits in Pennsylvania.
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