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Crushed And Broken Limestone, major discharger, Rockwood, Michigan. NPDES permit MI0001368 expired Sep 30, 2018; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 002 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 002 |
| Sulfate [as S] | daily maximum | report only (ug/L) | all year | 002 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3 mg/L | all year | 002 |
| pH | daily minimum | ≥ 6.5 SU | all year | 002 |
| pH | daily maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 002 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 002 |
| Solids, total suspended | monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 2800 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 4100 lb/d | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 20 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 30 mg/L | all year | 002 |
| Solids, total suspended | maximum monthly average | ≤ 2800 lb/d | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 4100 lb/d | all year | 002 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 002 |
| Sulfate, dissolved [as SO4] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (ug/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 |
| Copper, total [as Cu] | monthly average | ≤ 33 ug/L | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total [as Cu] | monthly average | ≤ 4.5 lb/d | all year | 002 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 002 |
| Copper, total [as Cu] | maximum monthly average | ≤ 33 ug/L | all year | 002 |
| Copper, total [as Cu] | maximum monthly average | ≤ 4.5 lb/d | all year | 002 |
| Toxicity, choice of species | monthly average | ≤ 1 tox chronic | all year | 002 |
| Toxicity, choice of species | daily maximum | report only (tox chronic) | 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 |
| 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 |
| Flow, in conduit or thru treatment plant | maximum monthly average | report only (MGD) | all year | 002 |
| Flow, in conduit or thru treatment plant | daily maximum | report only (MGD) | all year | 002 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 002 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 002 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 002 |
| Sulfate | daily maximum | report only (mg/L) | all year | 002 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 002 |
| TU Static 24 Hr Acute Pimephales promelas | daily maximum | report only (tox acute) | all year | 002 |
| Static 48 Hr Chronic Pimphales Promelas | monthly average | ≤ 1 tox chronic | all year | 002 |
| Static 48 Hr Chronic Pimphales Promelas | daily maximum | report only (tox chronic) | all year | 002 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 003 |
| Conductivity | daily maximum | report only (umho/cm) | all year | 003 |
| Sulfate [as S] | daily maximum | report only (ug/L) | all year | 003 |
| Oxygen, dissolved [DO] | daily minimum | ≥ 3 mg/L | all year | 003 |
| pH | daily minimum | ≥ 6.5 SU | all year | 003 |
| pH | daily maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 003 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 003 |
| Chloride [as Cl] | daily maximum | report only (mg/L) | all year | 003 |
| Sulfate, dissolved [as SO4] | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total [as Cu] | monthly average | report only (ug/L) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (ug/L) | all year | 003 |
| Copper, total [as Cu] | monthly average | report only (lb/d) | all year | 003 |
| Copper, total [as Cu] | daily maximum | report only (lb/d) | all year | 003 |
| Toxicity, choice of species | monthly average | ≤ 1 tox chronic | all year | 003 |
| Toxicity, choice of species | daily maximum | report only (tox chronic) | 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 |
| Toxicity [acute], Ceriodaphnia dubia | daily maximum | report only (tox acute) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Hydrogen sulfide | daily maximum | report only (ug/L) | all year | 003 |
| Sulfate | daily maximum | report only (mg/L) | all year | 003 |
| Outfall observation,visual, y/n response | value | report only (N=0;Y=1) | all year | 003 |
| TU Static 24 Hr Acute Pimephales promelas | daily maximum | report only (tox acute) | all year | 003 |
| Static 48 Hr Chronic Pimphales Promelas | monthly average | ≤ 1 tox chronic | all year | 003 |
| Static 48 Hr Chronic Pimphales Promelas | daily maximum | report only (tox chronic) | all year | 003 |
Cited limits by parameter: Michigan's rules and the federal ones.
Same industry: the 17 Mining and Quarrying of Nonmetallic Minerals permits in Michigan.
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On EPA ECHO: Facility report · DMR history
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