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Water Supply, Butler, Pennsylvania. NPDES permit PA0210161, in force until Jun 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (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 |
| pH | daily minimum | ≥ 6 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 002 |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| pH | daily minimum | report only (SU) | all year | 100 |
| pH | daily maximum | report only (SU) | all year | 100 |
| Hardness, total [as CaCO3] | monthly average | report only (mg/L) | all year | 100 |
| Arsenic, total [as As] | monthly average | report only (mg/L) | all year | 100 |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year | 100 |
| Arsenic, total [as As] | monthly average | report only (lb/d) | all year | 100 |
| Arsenic, total [as As] | daily maximum | report only (lb/d) | all year | 100 |
| Copper, total [as Cu] | monthly average | report only (mg/L) | all year | 100 |
| Copper, total [as Cu] | daily maximum | report only (mg/L) | all year | 100 |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year | 100 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 100 |
| Iron, total [as Fe] | monthly average | report only (mg/L) | all year | 100 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 100 |
| Iron, total [as Fe] | monthly average | report only (lb/d) | all year | 100 |
| Iron, total [as Fe] | daily maximum | report only (lb/d) | all year | 100 |
| Manganese, total [as Mn] | monthly average | report only (mg/L) | all year | 100 |
| Manganese, total [as Mn] | daily maximum | report only (mg/L) | all year | 100 |
| Manganese, total [as Mn] | monthly average | report only (lb/d) | all year | 100 |
| Manganese, total [as Mn] | daily maximum | report only (lb/d) | all year | 100 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 100 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 100 |
| Nickel, total [as Ni] | monthly average | report only (lb/d) | all year | 100 |
| Nickel, total [as Ni] | daily maximum | report only (lb/d) | all year | 100 |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year | 100 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 100 |
| Zinc, total [as Zn] | monthly average | report only (lb/d) | all year | 100 |
| Zinc, total [as Zn] | daily maximum | report only (lb/d) | all year | 100 |
| Aluminum, total [as Al] | monthly average | report only (mg/L) | all year | 100 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 100 |
| Aluminum, total [as Al] | monthly average | report only (lb/d) | all year | 100 |
| Aluminum, total [as Al] | daily maximum | report only (lb/d) | all year | 100 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Copper, total [as Cu], daily maximum outfall 001 | 0.45 lb/d | new | — | — |
| Copper, total [as Cu], daily maximum outfall 001 | 0.012 mg/L | new | — | — |
| Copper, total [as Cu], monthly average outfall 001 | 0.26 lb/d | new | — | — |
| Copper, total [as Cu], monthly average outfall 001 | 0.0069 mg/L | new | — | — |
| Copper, total [as Cu], daily maximum outfall 002 | 0.012 mg/L | new | — | — |
| Copper, total [as Cu], daily maximum outfall 002 | 0.15 lb/d | new | — | — |
| Copper, total [as Cu], monthly average outfall 002 | 0.0069 mg/L | new | — | — |
| Copper, total [as Cu], monthly average outfall 002 | 0.086 lb/d | new | — | — |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
Same industry: the 214 Water Supply permits in Pennsylvania.
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