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Nonmetallic Minerals Services, Monaca, Pennsylvania. NPDES permit PA0218537 expired Aug 31, 2025; its limits still apply. Last 12 months: over a limit 21 times (last June 2026), 44 required values missing, 1 of 10 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| November 2025 | Boron, total [as B], monthly average | 1.91 mg/L | ≤ 1.69 mg/L | 13% |
| November 2025 | Cyanide, free available, monthly average | .0074 mg/L | ≤ .005 mg/L | 48% |
| December 2025 | Boron, total [as B], monthly average | 2.045 mg/L | ≤ 1.69 mg/L | 21% |
| December 2025 | Selenium, total [as Se], monthly average | .00645 mg/L | ≤ .005 mg/L | 29% |
| January 2026 | Cyanide, free available, daily maximum | .0279 mg/L | ≤ .009 mg/L | 210% |
| January 2026 | Cyanide, free available, monthly average | .02325 mg/L | ≤ .005 mg/L | 365% |
| January 2026 | Selenium, total [as Se], monthly average | .00675 mg/L | ≤ .005 mg/L | 35% |
| January 2026 | pH, maximum | 9.3 SU | ≤ 9 SU | — |
| February 2026 | Boron, total [as B], monthly average | 1.83 mg/L | ≤ 1.69 mg/L | 8% |
| February 2026 | Cyanide, free available, daily maximum | .0159 mg/L | ≤ .009 mg/L | 77% |
| February 2026 | Cyanide, free available, monthly average | .01335 mg/L | ≤ .005 mg/L | 167% |
| February 2026 | Selenium, total [as Se], monthly average | .0057 mg/L | ≤ .005 mg/L | 14% |
| April 2026 | Cyanide, free available, daily maximum | .0407 mg/L | ≤ .009 mg/L | 352% |
| April 2026 | Cyanide, free available, monthly average | .0291 mg/L | ≤ .005 mg/L | 482% |
| April 2026 | Selenium, total [as Se], monthly average | .0078 mg/L | ≤ .005 mg/L | 56% |
| April 2026 | pH, maximum | 9.6 SU | ≤ 9 SU | — |
| May 2026 | Cyanide, free available, monthly average | .00635 mg/L | ≤ .005 mg/L | 27% |
| May 2026 | Selenium, total [as Se], monthly average | .00725 mg/L | ≤ .005 mg/L | 45% |
| June 2026 | Boron, total [as B], monthly average | 2.015 mg/L | ≤ 1.69 mg/L | 19% |
| June 2026 | Selenium, total [as Se], daily maximum | .0087 mg/L | ≤ .008 mg/L | 9% |
| June 2026 | Selenium, total [as Se], monthly average | .0085 mg/L | ≤ .005 mg/L | 70% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year |
| Arsenic, total [as As] | monthly average | report only (mg/L) | all year |
| Arsenic, total [as As] | daily maximum | report only (mg/L) | all year |
| Boron, total [as B] | monthly average | ≤ 1.69 mg/L | all year |
| Boron, total [as B] | daily maximum | ≤ 2.64 mg/L | all year |
| Chromium, hexavalent [as Cr] | monthly average | report only (mg/L) | all year |
| Chromium, hexavalent [as Cr] | daily maximum | report only (mg/L) | all year |
| Lead, total [as Pb] | monthly average | report only (mg/L) | all year |
| Lead, total [as Pb] | daily maximum | report only (mg/L) | all year |
| Nickel, total [as Ni] | monthly average | report only (mg/L) | all year |
| Nickel, total [as Ni] | daily maximum | report only (mg/L) | all year |
| Zinc, total [as Zn] | monthly average | report only (mg/L) | all year |
| Zinc, total [as Zn] | daily maximum | report only (mg/L) | all year |
| Selenium, total [as Se] | monthly average | ≤ .005 mg/L | all year |
| Selenium, total [as Se] | daily maximum | ≤ .008 mg/L | all year |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year |
| Cyanide, free available | monthly average | ≤ .005 mg/L | all year |
| Cyanide, free available | daily maximum | ≤ .009 mg/L | all year |
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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