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Federal facility (Sewerage Systems), Yellowtail, Montana. NPDES permit MT0022993, in force until Feb 29, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| BOD, 5-day, 20 deg. C | 30-day average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | 7-day average | ≤ 45 mg/L | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year | 001 |
| Solids, total suspended | 7-day average | ≤ 45 mg/L | all year | 001 |
| E. coli | 30-day geometric mean | ≤ 126 #/100mL | all year | 001 |
| E. coli | daily maximum | ≤ 410 #/100mL | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Flow, total | 30-day average | report only (gal/d) | all year | 001 |
| Flow, total | daily maximum | report only (gal/d) | all year | 001 |
| Oil and grease visual | instantaneous maximum | < 1 N=0;Y=1 | all year | 001 |
| BOD, 5-day, 20 deg. C | 30-day average | report only (mg/L) | all year | 001I |
| BOD, 5-day, 20 deg. C | 7-day average | report only (mg/L) | all year | 001I |
| Solids, total suspended | 30-day average | report only (mg/L) | all year | 001I |
| Solids, total suspended | 7-day average | report only (mg/L) | all year | 001I |
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/MT0022993 · MCP: https://passage-data.com/mcp