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Sewage treatment plant, Unknown, Wyoming. NPDES permit WY0021024 expired Oct 31, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 003 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 90 mg/L | all year | 003 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | ≤ 30 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 90 mg/L | all year | 003 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 003 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 003 |
| Duration | monthly total | report only (d) | all year | 003 |
| Chlorine, total residual | monthly average | ≤ .003 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Chlorine, total residual | daily maximum | ≤ .01 mg/L | Apr–Sep | 003 |
| Chlorine, total residual | daily maximum | ≤ .005 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Chlorine, total residual | monthly average | ≤ .004 mg/L | Apr–Sep | 003 |
| E. coli | monthly geometric mean | ≤ 153 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | monthly geometric mean | ≤ 47 #/100mL | Apr–Sep | 003 |
| E. coli | daily maximum | ≤ 153 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | daily maximum | ≤ 113 #/100mL | Apr–Sep | 003 |
| Nitrogen, Ammonia Total | monthly average | ≤ .32 mg/L | Apr–Sep | 003 |
| Nitrogen, Ammonia Total | monthly average | ≤ .51 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Nitrogen, Ammonia Total | daily maximum | ≤ 1.45 mg/L | Apr–Sep | 003 |
| Nitrogen, Ammonia Total | daily maximum | ≤ 1.31 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Flow | monthly average | ≤ 1.8 MGD | all year | 003 |
| Flow | daily maximum | report only (MGD) | all year | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 003 |
| Produced water, oil and grease | daily maximum | report only (mg/L) | all year | 003 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 48-hour maximum | = 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | = 0 pass=0;fail=1 | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | DMP1 |
| pH | instantaneous maximum | report only (SU) | all year | DMP1 |
| pH | instantaneous minimum | report only (SU) | all year | DMP1 |
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/WY0021024 · MCP: https://passage-data.com/mcp