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Sewage treatment plant, major discharger, (Unknown City), Wyoming. NPDES permit WY0021458, in force until Oct 31, 2029. Last 12 months: no values over a limit, 1 required value missing, 1 of 41 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | monthly average | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily maximum | report only (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 | monthly 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 | monthly average | ≤ 100 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 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | report only (mg/L) | all year | 001 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Duration | monthly total | report only (d) | 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 |
| E. coli | monthly average | ≤ 630 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| E. coli | monthly average | ≤ 126 #/100mL | May–Sep | 001 |
| E. coli | daily maximum | ≤ 630 #/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 235 #/100mL | May–Sep | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Flow | monthly average | ≤ 5 MGD | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | ≤ 25 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | ≤ 40 mg/L | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | weekly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous [5 day, 20 C] | monthly average | report only (mg/L) | all year | 001 |
| BOD, carbonaceous, percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | ≥ 85 % | all year | 001 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 001 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 48-hour maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | BHR |
| pH | instantaneous minimum | report only (SU) | all year | BHR |
| pH | instantaneous maximum | report only (SU) | all year | BHR |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | BHR |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | BHR |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | BHR |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | BHR |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | BHR |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | DFC |
| pH | instantaneous minimum | report only (SU) | all year | DFC |
| pH | instantaneous maximum | report only (SU) | all year | DFC |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | DFC |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | DFC |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | DFC |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | DFC |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | DFC |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | SR1 |
| pH | instantaneous minimum | report only (SU) | all year | SR1 |
| pH | instantaneous maximum | report only (SU) | all year | SR1 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | SR1 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | SR1 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | SR1 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | SR1 |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | SR1 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | SR2 |
| pH | instantaneous minimum | report only (SU) | all year | SR2 |
| pH | instantaneous maximum | report only (SU) | all year | SR2 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | SR2 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | SR2 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | SR2 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | SR2 |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | SR2 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | UFC |
| pH | instantaneous minimum | report only (SU) | all year | UFC |
| pH | instantaneous maximum | report only (SU) | all year | UFC |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | UFC |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | UFC |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | UFC |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | UFC |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | UFC |
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/WY0021458 · MCP: https://passage-data.com/mcp