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Nonmetallic Minerals Services, West Mifflin, Pennsylvania. NPDES permit PA0004278, in force until Jun 30, 2029. Last 12 months: no values over a limit, 56 required values missing, 1 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 001 |
| Boron, total [as B] | monthly average | report only (mg/L) | all year | 001 |
| Boron, total [as B] | daily maximum | report only (mg/L) | all year | 001 |
| Chromium, trivalent [as Cr] | monthly average | report only (ug/L) | all year | 001 |
| Chromium, trivalent [as Cr] | daily maximum | report only (ug/L) | all year | 001 |
| Cobalt, total [as Co] | monthly average | report only (ug/L) | all year | 001 |
| Cobalt, total [as Co] | daily maximum | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year | 001 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 001 |
| Iron, total [as Fe] | monthly average | ≤ 1.5 mg/L | all year | 001 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | 001 |
| Iron, dissolved [as Fe] | monthly average | report only (ug/L) | all year | 001 |
| Iron, dissolved [as Fe] | daily maximum | report only (ug/L) | all year | 001 |
| Manganese, total [as Mn] | monthly average | ≤ 2 mg/L | all year | 001 |
| Manganese, total [as Mn] | daily maximum | ≤ 4 mg/L | all year | 001 |
| Nickel, total [as Ni] | monthly average | ≤ .054 mg/L | all year | 001 |
| Nickel, total [as Ni] | daily maximum | ≤ .108 mg/L | all year | 001 |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year | 001 |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year | 001 |
| Aluminum, total [as Al] | monthly average | ≤ .5 mg/L | all year | 001 |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | all year | 001 |
| Selenium, total [as Se] | monthly average | report only (ug/L) | all year | 001 |
| Selenium, total [as Se] | daily maximum | report only (ug/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 |
| Perfluorooctanoic acid (PFOA) | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorooctanesulfonate | daily maximum | report only (ng/L) | all year | 001 |
| Perfluorobutanesulfonic acid (PFBS) | daily maximum | report only (ng/L) | all year | 001 |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) | daily maximum | report only (ng/L) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 002 |
| Iron, total [as Fe] | monthly average | ≤ 1.5 mg/L | all year | 002 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | 002 |
| Manganese, total [as Mn] | monthly average | ≤ 2 mg/L | all year | 002 |
| Manganese, total [as Mn] | daily maximum | ≤ 4 mg/L | all year | 002 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 002 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 002 |
| Aluminum, total [as Al] | monthly average | ≤ .75 mg/L | all year | 002 |
| Aluminum, total [as Al] | daily maximum | ≤ .75 mg/L | 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 | instantaneous minimum | ≥ 6 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 35 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 70 mg/L | all year | 003 |
| Iron, total [as Fe] | monthly average | ≤ 1.5 mg/L | all year | 003 |
| Iron, total [as Fe] | daily maximum | ≤ 3 mg/L | all year | 003 |
| Manganese, total [as Mn] | monthly average | ≤ 2 mg/L | all year | 003 |
| Manganese, total [as Mn] | daily maximum | ≤ 4 mg/L | all year | 003 |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year | 003 |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year | 003 |
| Aluminum, total [as Al] | monthly average | ≤ .75 mg/L | all year | 003 |
| Aluminum, total [as Al] | daily maximum | ≤ .75 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 |
| pH | daily maximum | report only (SU) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| Oil & Grease | daily maximum | report only (mg/L) | all year | 005 |
| Iron, total [as Fe] | daily maximum | report only (mg/L) | all year | 005 |
| Aluminum, total [as Al] | daily maximum | report only (mg/L) | all year | 005 |
Cited limits by parameter: Pennsylvania's rules and the federal ones.
Same industry: the 7 Mining and Quarrying of Nonmetallic Minerals permits in Pennsylvania.
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