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Miscellaneous Nonmetallic Minerals, Cromwell, Minnesota. NPDES permit MN0055115 expired Jun 30, 2025; its limits still apply. Last 12 months: over a limit once (last May 2026), 9 of 99 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | Solids, total suspended, monthly average | 34 | ≤ 30 mg/L | 13% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | monthly minimum | report only (SU) | all year | D001 |
| pH | monthly maximum | ≤ 8.5 SU | all year | D001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D001 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | D001 |
| Solids, total suspended | monthly maximum | ≤ 45 mg/L | all year | D001 |
| Nitrogen, total [as N] | monthly maximum | report only (mg/L) | all year | D001 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | all year | D001 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | all year | D001 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D001 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D001 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D001 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D001 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | all year | D001 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | D001 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | all year | D001 |
| pH | monthly minimum | report only (SU) | all year | D002 |
| pH | monthly maximum | ≤ 8.5 SU | all year | D002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D002 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D002 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | D002 |
| Solids, total suspended | monthly maximum | ≤ 45 mg/L | all year | D002 |
| Nitrogen, total [as N] | monthly maximum | report only (mg/L) | all year | D002 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | all year | D002 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | all year | D002 |
| Phosphorus, total [as P] | monthly average | ≤ 1 mg/L | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D002 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D002 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D002 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | all year | D002 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | D002 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | all year | D002 |
| pH | monthly minimum | report only (SU) | all year | D007 |
| pH | monthly maximum | ≤ 8.5 SU | all year | D007 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D007 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D007 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | D007 |
| Solids, total suspended | monthly maximum | ≤ 45 mg/L | all year | D007 |
| Nitrogen, total [as N] | monthly maximum | report only (mg/L) | all year | D007 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | all year | D007 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | all year | D007 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D007 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D007 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D007 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D007 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | all year | D007 |
| Mercury, total [as Hg] | monthly average | report only (ng/L) | all year | D007 |
| Mercury, total [as Hg] | monthly maximum | report only (ng/L) | all year | D007 |
| Phosphorus, total [as P] | annual total | ≤ 110 kg/yr | all year | D008 |
| pH | monthly minimum | report only (SU) | all year | W005 |
| pH | monthly maximum | report only (SU) | all year | W005 |
| pH | monthly minimum | report only (SU) | all year | W006 |
| pH | monthly maximum | report only (SU) | all year | W006 |
Cited limits by parameter: Minnesota's rules and the federal ones.
Same industry: the 13 Mining and Quarrying of Nonmetallic Minerals permits in Minnesota.
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