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Sewage treatment plant, Ranchester, Wyoming. NPDES permit WY0022161, in force until Sep 30, 2030. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| May 2026 | BOD, 5-day, 20 deg. C, monthly average | 39 mg/L | ≤ 30 mg/L | 30% |
| June 2026 | E. coli, daily maximum | 238 MPN/100mL | ≤ 235 MPN/100mL | 1% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily average | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily average | report only (deg C) | all year | 001 |
| Oxygen, dissolved [DO] | daily maximum | report only (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 | 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 | daily maximum | 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 | 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 | 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 |
| 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 | 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] | daily maximum | 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 |
| Duration | monthly total | report only (d) | all year | 001 |
| Duration | monthly total | report only (d) | all year | 001 |
| Chlorine, total residual | monthly average | ≤ .22 mg/L | May–Sep | 001 |
| Chlorine, total residual | monthly average | ≤ .22 mg/L | May–Sep | 001 |
| Chlorine, total residual | monthly average | ≤ .18 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | monthly average | ≤ .18 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .37 mg/L | May–Sep | 001 |
| Chlorine, total residual | daily maximum | ≤ .37 mg/L | May–Sep | 001 |
| Chlorine, total residual | daily maximum | ≤ .31 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .31 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| E. coli | monthly average | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| E. coli | monthly average | ≤ 126 MPN/100mL | May–Sep | 001 |
| E. coli | daily maximum | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 235 MPN/100mL | May–Sep | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Flow | monthly average | ≤ .3 MGD | all year | 001 |
| Flow | monthly average | ≤ .3 MGD | all year | 001 |
| Flow | daily maximum | report only (MGD) | all year | 001 |
| Flow | daily maximum | report only (MGD) | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 001 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year | 001 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year | 001 |
| Ammonia & ammonium- total | monthly average | ≤ 33 mg/L | May–Oct | 001 |
| Ammonia & ammonium- total | monthly average | ≤ 33 mg/L | May–Oct | 001 |
| Ammonia & ammonium- total | monthly average | ≤ 33.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Ammonia & ammonium- total | monthly average | ≤ 33.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Ammonia & ammonium- total | daily maximum | ≤ 109.7 mg/L | May–Oct | 001 |
| Ammonia & ammonium- total | daily maximum | ≤ 109.7 mg/L | May–Oct | 001 |
| Ammonia & ammonium- total | daily maximum | ≤ 74.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Ammonia & ammonium- total | daily maximum | ≤ 74.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 001 |
| Produced water, oil and grease | daily maximum | report only (mg/L) | all year | 001 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 002 |
| pH | instantaneous minimum | report only (SU) | all year | 002 |
| pH | instantaneous maximum | report only (SU) | all year | 002 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 002 |
| E. coli | daily maximum | report only (MPN/100mL) | all year | 002 |
| Flow | annual average | report only (MGD) | all year | 002 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 003 |
| pH | instantaneous minimum | report only (SU) | all year | 003 |
| pH | instantaneous maximum | report only (SU) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| E. coli | daily maximum | report only (MPN/100mL) | all year | 003 |
| Flow | annual average | report only (MGD) | all year | 003 |
| Temperature, water deg. centigrade | daily average | report only (deg C) | all year | 004 |
| Temperature, water deg. centigrade | daily average | report only (deg C) | all year | 004 |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | ≤ 30 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly average | ≤ 45 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | monthly average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | weekly average | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 004 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 004 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year | 004 |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year | 004 |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year | 004 |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 004 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 004 |
| Duration | monthly total | report only (d) | all year | 004 |
| Duration | monthly total | report only (d) | all year | 004 |
| Chlorine, total residual | monthly average | ≤ .22 mg/L | May–Sep | 004 |
| Chlorine, total residual | monthly average | ≤ .22 mg/L | May–Sep | 004 |
| Chlorine, total residual | monthly average | ≤ .18 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| Chlorine, total residual | monthly average | ≤ .18 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| Chlorine, total residual | daily maximum | ≤ .37 mg/L | May–Sep | 004 |
| Chlorine, total residual | daily maximum | ≤ .37 mg/L | May–Sep | 004 |
| Chlorine, total residual | daily maximum | ≤ .31 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| Chlorine, total residual | daily maximum | ≤ .31 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| E. coli | monthly average | ≤ 126 MPN/100mL | May–Sep | 004 |
| E. coli | monthly average | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| E. coli | daily maximum | ≤ 235 MPN/100mL | May–Sep | 004 |
| E. coli | daily maximum | ≤ 630 MPN/100mL | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 004 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 004 |
| Flow | monthly average | ≤ .3 MGD | all year | 004 |
| Flow | monthly average | ≤ .3 MGD | all year | 004 |
| Flow | daily maximum | report only (MGD) | all year | 004 |
| Flow | daily maximum | report only (MGD) | all year | 004 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 004 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 004 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year | 004 |
| Solids, suspended percent removal | monthly average minimum | report only (%) | all year | 004 |
| Ammonia & ammonium- total | monthly average | ≤ 33.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Ammonia & ammonium- total | monthly average | ≤ 33.4 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Ammonia & ammonium- total | monthly average | ≤ 33 mg/L | May–Oct | 004 |
| Ammonia & ammonium- total | monthly average | ≤ 33 mg/L | May–Oct | 004 |
| Ammonia & ammonium- total | daily maximum | ≤ 74.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Ammonia & ammonium- total | daily maximum | ≤ 74.2 mg/L | Jan, Feb, Mar, Apr, Nov, Dec | 004 |
| Ammonia & ammonium- total | daily maximum | ≤ 109.7 mg/L | May–Oct | 004 |
| Ammonia & ammonium- total | daily maximum | ≤ 109.7 mg/L | May–Oct | 004 |
| Produced water, oil and grease | daily maximum | report only (mg/L) | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | report only (mg/L) | all year | 005 |
| pH | instantaneous minimum | report only (SU) | all year | 005 |
| pH | instantaneous maximum | report only (SU) | all year | 005 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 005 |
| E. coli | daily maximum | report only (MPN/100mL) | all year | 005 |
| Flow | annual average | report only (MGD) | all year | 005 |
| Flow | monthly average | ≤ .3 MGD | all year | SUMQ |
| Flow | monthly average | ≤ .3 MGD | all year | SUMQ |
| Flow | daily maximum | report only (MGD) | all year | SUMQ |
| Flow | daily maximum | report only (MGD) | all year | SUMQ |
Cited limits by parameter: Wyoming's rules and the federal ones.
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Your permit document is the final word. As JSON: /api/v1/permits/WY0022161 · MCP: https://passage-data.com/mcp