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Cement, Hydraulic, Clancy, Montana. NPDES permit MT0000451 expired Jan 31, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Flow rate | monthly average | report only (MGD) | all year | 001 |
| Flow rate | daily maximum | report only (MGD) | all year | 001 |
| Sulfate [as S] | monthly average | report only (mg/L) | all year | 001 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 001 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 50 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 3 lb/d | all year | 001 |
| Oil and grease, hexane extr method | single sample | report only (mg/L) | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Sep | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jul–Sep | 001 |
| Hardness, total [as CaCO3] | value | report only (mg/L) | all year | 001 |
| Sulfate, total [as SO4] | value | report only (mg/L) | all year | 001 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Arsenic, total recoverable | value | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Zinc, total recoverable | value | report only (ug/L) | all year | 001 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 001 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 001 |
| Lead, total recoverable | value | report only (ug/L) | all year | 001 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 001 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 001 |
| Copper, total recoverable | value | report only (ug/L) | all year | 001 |
| Duration | value | report only (d/mo) | all year | 001 |
| Oil and grease visual | value | report only (Y=0;N=1) | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| Sulfate [as S] | monthly average | report only (mg/L) | all year | 002 |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year | 002 |
| pH | instantaneous minimum | ≥ 6 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Solids, total suspended | monthly average | ≤ 50 mg/L | all year | 002 |
| Solids, total suspended | daily maximum | ≤ 50 mg/L | all year | 002 |
| Solids, total suspended | monthly average | ≤ 13.3 lb/d | all year | 002 |
| Oil and grease, hexane extr method | single sample | report only (mg/L) | all year | 002 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | Jul–Sep | 002 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Sep | 002 |
| Nitrogen, ammonia total [as N] | value | report only (mg/L) | all year | 002 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Sep | 002 |
| Nitrite + Nitrate total [as N] | value | report only (mg/L) | Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec | 002 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jul–Sep | 002 |
| Arsenic, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Arsenic, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Zinc, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Lead, total recoverable | monthly average | report only (ug/L) | all year | 002 |
| Lead, total recoverable | daily maximum | report only (ug/L) | all year | 002 |
| Copper, total recoverable | monthly average | report only (mg/L) | all year | 002 |
| Copper, total recoverable | daily maximum | report only (mg/L) | all year | 002 |
| Duration | value | report only (d/mo) | all year | 002 |
| Oil and grease visual | value | report only (Y=0;N=1) | all year | 002 |
Cited limits by parameter: Montana'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/MT0000451 · MCP: https://passage-data.com/mcp