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Sewage treatment plant, Unknown, Wyoming. NPDES permit WY0031712, in force until Sep 30, 2027. Last 12 months: over a limit 3 times (last May 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| March 2026 | BOD, 5-day, percent removal, monthly average minimum | 0 % | ≥ 65 % | 186% |
| March 2026 | pH, instantaneous maximum | 10.6 SU | ≤ 9 SU | — |
| May 2026 | BOD, 5-day, percent removal, monthly average minimum | 25 % | ≥ 65 % | 114% |
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year |
| 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 | daily maximum | report only (mg/L) | all year |
| Solids, total suspended | daily maximum | report only (mg/L) | 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 | ≤ 300 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 300 mg/L | all year |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.66 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 6.66 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.8 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 5.8 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.2 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 14.2 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.02 mg/L | May–Sep |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 18.02 mg/L | May–Sep |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | 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 | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ .05 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec |
| Chlorine, total residual | daily maximum | ≤ .06 mg/L | May–Sep |
| Chlorine, total residual | daily maximum | ≤ .06 mg/L | May–Sep |
| E. coli | monthly geometric mean | ≤ 1507 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 1507 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec |
| E. coli | monthly geometric mean | ≤ 496 #/100mL | Apr–Sep |
| E. coli | monthly geometric mean | ≤ 496 #/100mL | Apr–Sep |
| E. coli | daily maximum | ≤ 2731 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec |
| E. coli | daily maximum | ≤ 2731 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec |
| E. coli | daily maximum | ≤ 2731 #/100mL | Apr–Sep |
| E. coli | daily maximum | ≤ 2731 #/100mL | Apr–Sep |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | all year |
| Solids, total dissolved [TDS] | monthly average | report only (mg/L) | all year |
| Flow | daily maximum | report only (MGD) | all year |
| Flow | daily maximum | report only (MGD) | all year |
| Flow | monthly average | ≤ .175 MGD | all year |
| Flow | monthly average | ≤ .175 MGD | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | 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/WY0031712 · MCP: https://passage-data.com/mcp