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Manufacturing Industries, major discharger, Cheyenne, Wyoming. NPDES permit WY0000442, in force until Mar 31, 2028. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Temperature, water deg. centigrade | instantaneous maximum | ≤ 30 deg C | 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 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 003 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 003 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 003 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 003 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 003 |
| Nitrogen, ammonia total [as N] | monthly average | ≤ 2.09 mg/L | all year | 003 |
| Nitrogen, ammonia total [as N] | daily maximum | ≤ 20.86 mg/L | all year | 003 |
| Sulfide, total [as S] | monthly average | report only (ug/L) | all year | 003 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 003 |
| Zinc, dissolved [as Zn] | daily maximum | report only (ug/L) | all year | 003 |
| Duration | monthly total | report only (d/mo) | all year | 003 |
| Sulfide-hydrogen sulfide [undissociated] | monthly average | report only (ug/L) | all year | 003 |
| Sulfide-hydrogen sulfide [undissociated] | daily maximum | report only (ug/L) | all year | 003 |
| Flow | maximum monthly average | report only (MGD) | all year | 003 |
| Flow | daily average | report only (MGD) | all year | 003 |
| Flow, process wastewater | monthly average | ≤ .5 MGD | all year | 003 |
| Flow, process wastewater | daily maximum | report only (MGD) | all year | 003 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 003 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 48-hour maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 7-day maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 7-day maximum | ≤ 0 pass=0;fail=1 | all year | 003 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 008 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 008 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 008 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 008 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 008 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 008 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 110 mg/L | all year | 008 |
| Duration | monthly total | report only (d/mo) | all year | 008 |
| Flow | monthly average | report only (MGD) | all year | 008 |
| Flow | daily maximum | report only (MGD) | all year | 008 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 008 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 48-hour maximum | ≤ 0 pass=0;fail=1 | all year | 008 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | ≤ 0 pass=0;fail=1 | all year | 008 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 009 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 009 |
| Solids, total suspended | monthly average | report only (mg/L) | all year | 009 |
| Solids, total suspended | daily maximum | report only (mg/L) | all year | 009 |
| Solids, total suspended | daily maximum | report only (lb/d) | all year | 009 |
| Solids, total suspended | monthly average | report only (lb/d) | all year | 009 |
| Carbon, tot organic [TOC] | daily maximum | ≤ 110 mg/L | all year | 009 |
| Duration | monthly total | report only (d/mo) | all year | 009 |
| Flow | monthly average | report only (MGD) | all year | 009 |
| Flow | daily maximum | report only (MGD) | all year | 009 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 009 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 48-hour maximum | ≤ 0 pass=0;fail=1 | all year | 009 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | ≤ 0 pass=0;fail=1 | all year | 009 |
| Flow, process wastewater | monthly total | report only (MGD) | all year | POTW |
| Solids, total suspended | annual average | ≤ 262 lb/d | all year | SUM |
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/WY0000442 · MCP: https://passage-data.com/mcp