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Fish Hatcheries And Preserves, Spearfish, South Dakota. NPDES permit SD0000191 expired Jun 30, 2024; 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. centigrade | 30-day average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | 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 | ≤ 8.6 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 17.5 mg/L | all year | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Fish feed used | monthly total | report only (lb/mo) | all year | 001 |
| Biomass, fish | annual total | report only (lb/yr) | all year | 001 |
| Floating solids, waste or visible foam-visual | daily maximum | report only (abst=0;prst=1) | all year | 001 |
| Temperature, water deg. centigrade | 30-day average | report only (deg C) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 002 |
| Flow rate | 30-day average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | daily minimum | ≥ 6.6 SU | all year | 002 |
| pH | daily maximum | ≤ 8.6 SU | all year | 002 |
| Solids, total suspended | 30-day average | ≤ 10 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 17.5 mg/L | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Floating solids, waste or visible foam-visual | daily maximum | report only (abst=0;prst=1) | all year | 002 |
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/SD0000191 · MCP: https://passage-data.com/mcp