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Sewage treatment plant, Moorcroft, Wyoming. NPDES permit WY0021741, in force until Jan 31, 2031. Last 12 months: over a limit 6 times (last September 2026), 18 required values missing, 3 of 60 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | BOD, 5-day, 20 deg. C, monthly average | 58 mg/L | ≤ 30 mg/L | 93% |
| March 2026 | BOD, 5-day, 20 deg. C, weekly average | 58 mg/L | ≤ 45 mg/L | 29% |
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 80.6 % | ≥ 85 % | 29% |
| May 2026 | Nitrogen, ammonia total [as N], monthly average | 5.4 mg/L | ≤ .51 mg/L | 959% |
| June 2026 | Nitrogen, ammonia total [as N], monthly average | .56 mg/L | ≤ .51 mg/L | 10% |
| September 2026 | Nitrogen, ammonia total [as N], monthly average | .54 mg/L | ≤ .51 mg/L | 6% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year | 001 |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year | 001 |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .51 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .51 mg/L | May–Oct | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .92 mg/L (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ .92 mg/L (alert, not enforceable) | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Duration | monthly total | report only (d/mo) | all year | 001 |
| Duration | monthly total | report only (d/mo) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .011 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| Chlorine, total residual | daily maximum | ≤ .019 mg/L | all year | 001 |
| E. coli | monthly average | ≤ 126 CFU/100mL | May–Oct | 001 |
| E. coli | monthly average | ≤ 126 CFU/100mL | May–Oct | 001 |
| E. coli | monthly average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| E. coli | monthly average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 236 CFU/100mL | May–Oct | 001 |
| E. coli | daily maximum | ≤ 236 CFU/100mL | May–Oct | 001 |
| E. coli | daily maximum | ≤ 630 CFU/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 630 CFU/100mL | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Flow | daily maximum | ≤ .31 MGD | all year | 001 |
| Flow | daily maximum | ≤ .31 MGD | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 85 % | 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 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | DBF1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | DBF1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | DBF1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | DBF1 |
| pH | instantaneous maximum | report only (SU) | all year | DBF1 |
| pH | instantaneous maximum | report only (SU) | all year | DBF1 |
| pH | instantaneous minimum | report only (SU) | all year | DBF1 |
| pH | instantaneous minimum | report only (SU) | all year | DBF1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | DBF1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | DBF1 |
| Flow | daily maximum | report only (MGD) | all year | DBF1 |
| Flow | daily maximum | report only (MGD) | all year | DBF1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | DRC1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | DRC1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | DRC1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | DRC1 |
| pH | instantaneous maximum | report only (SU) | all year | DRC1 |
| pH | instantaneous maximum | report only (SU) | all year | DRC1 |
| pH | instantaneous minimum | report only (SU) | all year | DRC1 |
| pH | instantaneous minimum | report only (SU) | all year | DRC1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | DRC1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | DRC1 |
| Flow | daily maximum | report only (MGD) | all year | DRC1 |
| Flow | daily maximum | report only (MGD) | all year | DRC1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | UBF1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | UBF1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | UBF1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | UBF1 |
| pH | instantaneous maximum | report only (SU) | all year | UBF1 |
| pH | instantaneous maximum | report only (SU) | all year | UBF1 |
| pH | instantaneous minimum | report only (SU) | all year | UBF1 |
| pH | instantaneous minimum | report only (SU) | all year | UBF1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | UBF1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | UBF1 |
| Flow | daily maximum | report only (MGD) | all year | UBF1 |
| Flow | daily maximum | report only (MGD) | all year | UBF1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | URC1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | URC1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | URC1 |
| Temperature, water deg. centigrade | instantaneous minimum | report only (deg C) | all year | URC1 |
| pH | instantaneous maximum | report only (SU) | all year | URC1 |
| pH | instantaneous maximum | report only (SU) | all year | URC1 |
| pH | instantaneous minimum | report only (SU) | all year | URC1 |
| pH | instantaneous minimum | report only (SU) | all year | URC1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | URC1 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | URC1 |
| Flow | daily maximum | report only (MGD) | all year | URC1 |
| Flow | daily maximum | report only (MGD) | all year | URC1 |
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/WY0021741 · MCP: https://passage-data.com/mcp