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Miscellaneous Nonmetallic Minerals, Cromwell, Minnesota. NPDES permit MN0055662, in force until Apr 30, 2027. Last 12 months: over a limit 5 times (last April 2026), 35 required values missing. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Outfall | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|---|
| November 2025 | D009 | Solids, total suspended, daily maximum | 46 | ≤ 45 mg/L | 2% |
| November 2025 | D009 | Solids, total suspended, monthly average | 46 | ≤ 30 mg/L | 53% |
| March 2026 | D003 | pH, monthly minimum | 6.1 | ≥ 6.5 SU | — |
| April 2026 | D003 | pH, monthly minimum | 6.3 | ≥ 6.5 SU | — |
| April 2026 | D009 | pH, monthly minimum | 6.4 | ≥ 6.5 SU | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| pH | monthly minimum | ≥ 6.5 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 | daily 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 | ≤ 1 mg/L | all year | D001 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D001 |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | D001 |
| Carbon, dissolved organic [as C] | monthly maximum | report only (mg/L) | all year | D001 |
| Aluminum, total [as Al] | monthly average | report only (mg/L) | all year | D001 |
| Aluminum, total [as Al] | monthly maximum | report only (mg/L) | all year | D001 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly average | report only (mg/L) | all year | D001 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | 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 | ≤ 9.7 ng/L | all year | D001 |
| Mercury, total [as Hg] | monthly maximum | ≤ 17.1 ng/L | all year | D001 |
| pH | monthly minimum | ≥ 6.5 SU | all year | D003 |
| pH | monthly maximum | ≤ 8.5 SU | all year | D003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D003 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | D003 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | D003 |
| Nitrogen, total [as N] | monthly maximum | report only (mg/L) | all year | D003 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | all year | D003 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | all year | D003 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D003 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D003 |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | D003 |
| Carbon, dissolved organic [as C] | monthly maximum | report only (mg/L) | all year | D003 |
| Aluminum, total [as Al] | monthly average | report only (mg/L) | all year | D003 |
| Aluminum, total [as Al] | monthly maximum | report only (mg/L) | all year | D003 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly average | report only (mg/L) | all year | D003 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D003 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D003 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D003 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D003 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D003 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | all year | D003 |
| Mercury, total [as Hg] | monthly average | ≤ 9.7 ng/L | all year | D003 |
| Mercury, total [as Hg] | monthly maximum | ≤ 17.1 ng/L | all year | D003 |
| pH | monthly minimum | ≥ 6.5 SU | all year | D009 |
| pH | monthly maximum | ≤ 8.5 SU | all year | D009 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | D009 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | D009 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | D009 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | D009 |
| Nitrogen, total [as N] | monthly maximum | report only (mg/L) | all year | D009 |
| Nitrogen, Kjeldahl, total [as N] | monthly maximum | report only (mg/L) | all year | D009 |
| Nitrite + Nitrate total [as N] | monthly maximum | report only (mg/L) | all year | D009 |
| Phosphorus, total [as P] | monthly average | report only (mg/L) | all year | D009 |
| Phosphorus, total [as P] | monthly average | report only (kg/d) | all year | D009 |
| Carbon, dissolved organic [as C] | monthly average | report only (mg/L) | all year | D009 |
| Carbon, dissolved organic [as C] | monthly maximum | report only (mg/L) | all year | D009 |
| Aluminum, total [as Al] | monthly average | report only (mg/L) | all year | D009 |
| Aluminum, total [as Al] | monthly maximum | report only (mg/L) | all year | D009 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly average | report only (mg/L) | all year | D009 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | D009 |
| Flow, in conduit or thru treatment plant | monthly average | report only (MGD) | all year | D009 |
| Flow, in conduit or thru treatment plant | monthly maximum | report only (MGD) | all year | D009 |
| Flow, in conduit or thru treatment plant | monthly total | report only (Mgal/mo) | all year | D009 |
| Mercury, dissolved [as Hg] | monthly average | report only (ng/L) | all year | D009 |
| Mercury, dissolved [as Hg] | monthly maximum | report only (ng/L) | all year | D009 |
| Mercury, total [as Hg] | monthly average | ≤ 9.7 ng/L | all year | D009 |
| Mercury, total [as Hg] | monthly maximum | ≤ 17.1 ng/L | all year | D009 |
| Phosphorus, total [as P] | annual total | ≤ 594 kg/yr | all year | D012 |
| pH | monthly maximum | report only (SU) | all year | W006 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | W006 |
| Carbon, dissolved organic [as C] | monthly maximum | report only (mg/L) | all year | W006 |
| Aluminum, total [as Al] | monthly maximum | report only (mg/L) | all year | W006 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W006 |
| pH | monthly maximum | report only (SU) | all year | W007 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | W007 |
| Carbon, dissolved organic [as C] | monthly maximum | report only (mg/L) | all year | W007 |
| Aluminum, total [as Al] | monthly maximum | report only (mg/L) | all year | W007 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W007 |
| pH | monthly maximum | report only (SU) | all year | W011 |
| Solids, total suspended | monthly maximum | report only (mg/L) | all year | W011 |
| Carbon, dissolved organic [as C] | monthly maximum | report only (mg/L) | all year | W011 |
| Aluminum, total [as Al] | monthly maximum | report only (mg/L) | all year | W011 |
| Hardness, Ca Mg Calculated [mg/L as CaCO3] | monthly maximum | report only (mg/L) | all year | W011 |
| Parameter | New limit | New or tighter | Median, last 12 months | × new limit |
|---|---|---|---|---|
| Mercury, total [as Hg], monthly average | 9.7 ng/L | new | — | — |
| Mercury, total [as Hg], monthly maximum | 17.1 ng/L | new | — | — |
| Phosphorus, total [as P], monthly average | 1 mg/L | new | — | — |
| Solids, total suspended, daily maximum | 45 mg/L | new | — | — |
| Solids, total suspended, monthly average | 30 mg/L | new | — | — |
| pH, monthly maximum | 8.5 SU | new | — | — |
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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