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Sewage treatment plant, major discharger, Unknown, Wyoming. NPDES permit WY0020176, in force until Apr 30, 2027. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| 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 | weekly average | ≤ 45 mg/L | all year | 003 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 90 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 | daily maximum | report only (mg/L) | all year | 003 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 003 |
| Solids, total suspended | weekly average | ≤ 65 mg/L | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | weekly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 27.01 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 29.85 mg/L | Apr–Sep | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 81.68 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 140.06 mg/L | Apr–Sep | 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 |
| Chlorine, total residual | monthly average | ≤ .04 mg/L | Apr–Sep | 003 |
| Chlorine, total residual | monthly average | ≤ .06 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Chlorine, total residual | daily maximum | ≤ .06 mg/L | Apr–Sep | 003 |
| Chlorine, total residual | daily maximum | ≤ .11 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | monthly average | ≤ 126 CFU/100mL | Apr–Sep | 003 |
| E. coli | daily maximum | ≤ 630 CFU/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| E. coli | daily maximum | ≤ 235 CFU/100mL | Apr–Sep | 003 |
| E. coli | monthly average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 003 |
| Flow | monthly average | 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 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 003 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day maximum | = 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day maximum | = 0 pass=0;fail=1 | all year | 003 |
| Temperature, water deg. centigrade | daily maximum | 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 | weekly average | ≤ 45 mg/L | all year | 004 |
| BOD, 5-day, 20 deg. C | daily maximum | ≤ 90 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 | daily maximum | report only (mg/L) | all year | 004 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 004 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 004 |
| Solids, total suspended | monthly average | ≤ 45 mg/L | all year | 004 |
| Solids, total suspended | weekly average | ≤ 65 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 | daily maximum | report only (mg/L) | all year | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 27.01 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 29.85 mg/L | Apr–Sep | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 81.68 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 140.06 mg/L | Apr–Sep | 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 |
| Chlorine, total residual | monthly average | ≤ .04 mg/L | Apr–Sep | 004 |
| Chlorine, total residual | monthly average | ≤ .06 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| Chlorine, total residual | daily maximum | ≤ .06 mg/L | Apr–Sep | 004 |
| Chlorine, total residual | daily maximum | ≤ .11 mg/L | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| E. coli | daily maximum | ≤ 630 CFU/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| E. coli | monthly average | ≤ 126 CFU/100mL | Apr–Sep | 004 |
| E. coli | monthly average | ≤ 630 CFU/100mL | Jan, Feb, Mar, Oct, Nov, Dec | 004 |
| E. coli | daily maximum | ≤ 235 CFU/100mL | Apr–Sep | 004 |
| Flow | monthly average | 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 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 004 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day maximum | = 0 pass=0;fail=1 | all year | 004 |
| Pass/Fail Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day maximum | = 0 pass=0;fail=1 | all year | 004 |
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year | DMP3 |
| pH | instantaneous maximum | report only (SU) | all year | DMP3 |
| pH | instantaneous minimum | report only (SU) | all year | DMP3 |
| Flow | monthly average | ≤ 1.95 MGD | all year | SUM |
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/WY0020176 · MCP: https://passage-data.com/mcp