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Sewage treatment plant, Great Falls, Montana. NPDES permit MT0000442, in force until May 31, 2029. 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 |
| pH | daily minimum | ≥ 6 SU | all year | 001 |
| pH | daily maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 45 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 325 lb/d | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 900 lb/d | all year | 001 |
| Nitrogen, total [as N] | monthly average | report only (mg/L) | Jul–Oct | 001 |
| Nitrogen, total [as N] | monthly average | report only (lb/d) | Jul–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, Kjeldahl, total [as N] | monthly average | report only (mg/L) | Jul–Oct | 001 |
| Nitrite + Nitrate total [as N] | monthly average | report only (mg/L) | Jul–Oct | 001 |
| Aluminum, dissolved [as Al] | monthly average | report only (mg/L) | all year | 001 |
| Aluminum, dissolved [as Al] | daily maximum | report only (mg/L) | all year | 001 |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .09999 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .16 mg/L | all year | 001 |
| Haloacetic acids [HAA5] | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | monthly average | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Sulfate | monthly average | report only (mg/L) | all year | 001 |
| Sulfate | daily maximum | report only (mg/L) | all year | 001 |
| Duration of discharge | value | report only (d) | all year | 001 |
| Oil and grease visual | value | report only (N=0;Y=1) | all year | 001 |
| Flow rate | monthly average | report only (MGD) | all year | 002 |
| Flow rate | daily maximum | report only (MGD) | all year | 002 |
| pH | daily minimum | report only (SU) | all year | 002 |
| pH | daily maximum | report only (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 |
| Aluminum, dissolved [as Al] | monthly average | report only (mg/L) | all year | 002 |
| Aluminum, dissolved [as Al] | daily maximum | report only (mg/L) | all year | 002 |
| N-Nitrosodimethylamine [NDMA] | daily maximum | report only (ug/L) | all year | 002 |
| Chlorine, total residual | monthly average | report only (mg/L) | all year | 002 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 002 |
| Duration of discharge | value | report only (d) | all year | 002 |
| Oil and grease visual | value | report only (N=0;Y=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/MT0000442 · MCP: https://passage-data.com/mcp