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Sewage treatment plant, Big Piney, Wyoming. NPDES permit WY0020133, in force until Mar 31, 2028. Last 12 months: over a limit once (last July 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| July 2026 | BOD, 5-day, percent removal, monthly average minimum | 50 % | ≥ 65 % | 43% |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 001 |
| Temperature, water deg. centigrade | daily maximum | 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 | ≤ 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 | ≤ 300 mg/L | all year | 001 |
| Solids, total suspended | daily maximum | ≤ 300 mg/L | all year | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.3 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.3 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.75 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.75 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.42 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.42 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.58 mg/L | May–Sep | 001 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.58 mg/L | May–Sep | 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 | ≤ .029 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | monthly average | ≤ .029 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | monthly average | ≤ .064 mg/L | May–Sep | 001 |
| Chlorine, total residual | monthly average | ≤ .064 mg/L | May–Sep | 001 |
| Chlorine, total residual | daily maximum | ≤ .051 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .051 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 001 |
| Chlorine, total residual | daily maximum | ≤ .11 mg/L | May–Sep | 001 |
| Chlorine, total residual | daily maximum | ≤ .11 mg/L | May–Sep | 001 |
| E. coli | monthly geometric mean | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| E. coli | monthly geometric mean | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| E. coli | monthly geometric mean | ≤ 635 #/100mL | Apr–Sep | 001 |
| E. coli | monthly geometric mean | ≤ 635 #/100mL | Apr–Sep | 001 |
| E. coli | daily maximum | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 001 |
| E. coli | daily maximum | ≤ 3246 #/100mL | Apr–Sep | 001 |
| E. coli | daily maximum | ≤ 3246 #/100mL | Apr–Sep | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 400 mg/L | all year | 001 |
| Solids, total dissolved | daily maximum | ≤ 400 mg/L | all year | 001 |
| Flow | monthly average | ≤ .35 MGD | all year | 001 |
| Flow | monthly average | ≤ .35 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 |
| 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 |
| Duration | monthly total | report only (d) | all year | 002 |
| Chlorine, total residual | daily maximum | report only (mg/L) | all year | 002 |
| E. coli | daily maximum | report only (#/100mL) | all year | 002 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | 002 |
| Flow | daily maximum | report only (MGD) | all year | 002 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | 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 | ≤ 30 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 | weekly average | ≤ 45 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 | 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 | 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 | 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 | daily maximum | report only (mg/L) | all year | 003 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 003 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year | 003 |
| Solids, total suspended | monthly average | ≤ 100 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 150 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 300 mg/L | all year | 003 |
| Solids, total suspended | daily maximum | ≤ 300 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.75 mg/L | May–Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 12.75 mg/L | May–Sep | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.3 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 8.3 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.58 mg/L | May–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 46.58 mg/L | May–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.42 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 21.42 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 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 |
| Duration | monthly total | report only (d) | all year | 003 |
| Chlorine, total residual | monthly average | ≤ .064 mg/L | May–Sep | 003 |
| Chlorine, total residual | monthly average | ≤ .064 mg/L | May–Sep | 003 |
| Chlorine, total residual | monthly average | ≤ .029 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Chlorine, total residual | monthly average | ≤ .029 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Chlorine, total residual | daily maximum | ≤ .11 mg/L | May–Sep | 003 |
| Chlorine, total residual | daily maximum | ≤ .11 mg/L | May–Sep | 003 |
| Chlorine, total residual | daily maximum | ≤ .051 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| Chlorine, total residual | daily maximum | ≤ .051 mg/L | Jan, Feb, Mar, Apr, Oct, Nov, Dec | 003 |
| E. coli | monthly geometric mean | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | monthly geometric mean | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | monthly geometric mean | ≤ 635 #/100mL | Apr–Sep | 003 |
| E. coli | monthly geometric mean | ≤ 635 #/100mL | Apr–Sep | 003 |
| E. coli | daily maximum | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | daily maximum | ≤ 1644 #/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | daily maximum | ≤ 3246 #/100mL | Apr–Sep | 003 |
| E. coli | daily maximum | ≤ 3246 #/100mL | Apr–Sep | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | ≤ 400 mg/L | all year | 003 |
| Solids, total dissolved | daily maximum | ≤ 400 mg/L | all year | 003 |
| Flow | monthly average | ≤ .35 MGD | all year | 003 |
| Flow | monthly average | ≤ .35 MGD | all year | 003 |
| Flow | daily maximum | report only (MGD) | all year | 003 |
| Flow | daily maximum | report only (MGD) | all year | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 003 |
| BOD, 5-day, percent removal | monthly average minimum | ≥ 65 % | all year | 003 |
| Produced water, oil and grease | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | CRS1 |
| Solids, total dissolved | daily maximum | report only (mg/L) | all year | CRS1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | STR1 |
| Temperature, water deg. centigrade | instantaneous maximum | report only (deg C) | all year | STR1 |
| pH | instantaneous maximum | report only (SU) | all year | STR1 |
| pH | instantaneous maximum | report only (SU) | all year | STR1 |
| pH | instantaneous minimum | report only (SU) | all year | STR1 |
| pH | instantaneous minimum | report only (SU) | all year | STR1 |
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/WY0020133 · MCP: https://passage-data.com/mcp