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Cement, Hydraulic, Rapid City, South Dakota. NPDES permit SD0000027 expired Sep 30, 2013; 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 | 30-day average | report only (deg F) | all year | 001 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 001 |
| Flow rate | 30-day average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| pH | daily minimum | ≥ 6.6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 001 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 001 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | ≤ 75 deg F | all year | 003 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 003 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 003 |
| Flow rate | 30-day average | report only (MGD) | all year | 003 |
| Flow rate | daily maximum | report only (MGD) | all year | 003 |
| Total production - mass | 30-day average | report only (lb/d) | all year | 003 |
| pH | daily minimum | ≥ 6.6 SU | all year | 003 |
| pH | daily maximum | ≤ 8.6 SU | all year | 003 |
| Alkalinity, total [as CaCO3] | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 003 |
| Oil and grease, hexane extr method | daily maximum | ≤ 10 mg/L | all year | 003 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 003 |
| Solids, total dissolved | 30-day average | ≤ 1000 mg/L | all year | 003 |
| Solids, total dissolved | daily maximum | ≤ 1750 mg/L | all year | 003 |
| Flow, process wastewater | 30-day average | report only (MGD) | all year | 003 |
| Flow, process wastewater | daily maximum | report only (MGD) | all year | 003 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 003 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 004 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 004 |
| Flow rate | 30-day average | report only (MGD) | all year | 004 |
| Flow rate | daily maximum | report only (MGD) | all year | 004 |
| pH | daily minimum | ≥ 6 SU | all year | 004 |
| pH | daily maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | 30-day average | ≤ 50 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 004 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 004 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 004 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 004 |
| Temperature, water deg. fahrenheit | 30-day average | report only (deg F) | all year | 005 |
| Temperature, water deg. fahrenheit | daily maximum | report only (deg F) | all year | 005 |
| Flow rate | 30-day average | report only (MGD) | all year | 005 |
| Flow rate | daily maximum | report only (MGD) | all year | 005 |
| pH | daily minimum | ≥ 6 SU | all year | 005 |
| pH | daily maximum | ≤ 9 SU | all year | 005 |
| Solids, total suspended | 30-day average | ≤ 50 mg/L | all year | 005 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 005 |
| Oil and grease, hexane extr method | daily maximum | report only (mg/L) | all year | 005 |
| Nickel, total recoverable | 30-day average | report only (mg/L) | all year | 005 |
| Nickel, total recoverable | daily maximum | report only (mg/L) | all year | 005 |
| Zinc, total recoverable | 30-day average | report only (mg/L) | all year | 005 |
| Zinc, total recoverable | daily maximum | report only (mg/L) | all year | 005 |
| Copper, total recoverable | 30-day average | report only (mg/L) | all year | 005 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 005 |
| Floating solids, waste or visible foam-visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 005 |
| Oil and grease visual | daily maximum | ≤ 0 N=0;Y=1 | all year | 005 |
Cited limits by parameter: South Dakota's rules and the federal ones.
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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/SD0000027 · MCP: https://passage-data.com/mcp