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Sewage treatment plant, Gillette,, Wyoming. NPDES permit WY0032522, in force until Oct 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year |
| pH | instantaneous minimum | ≥ 6.5 SU | all year |
| pH | instantaneous minimum | ≥ 6.5 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| pH | instantaneous maximum | ≤ 9 SU | all year |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | all year |
| Duration | monthly total | report only (d) | all year |
| Duration | monthly total | report only (d) | all year |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | May–Sep |
| E. coli | monthly geometric mean | ≤ 126 MPN/100mL | May–Sep |
| E. coli | monthly geometric mean | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| E. coli | daily maximum | ≤ 576 MPN/100mL | May–Sep |
| E. coli | daily maximum | ≤ 576 MPN/100mL | May–Sep |
| E. coli | daily maximum | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| E. coli | daily maximum | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Flow | monthly average | report only (MGD) | all year |
| Flow | monthly average | report only (MGD) | all year |
| Flow | daily maximum | report only (MGD) | all year |
| Flow | daily maximum | report only (MGD) | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year |
Cited limits by parameter: Wyoming'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/WY0032522 · MCP: https://passage-data.com/mcp