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Crude Petroleum And Natural Gas, (Unknown City), Wyoming. NPDES permit WY0000256, in force until Nov 30, 2028. Last 12 months: over a limit 4 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.
| Period ending | Parameter | Reported | Limit | Over by |
|---|---|---|---|---|
| December 2025 | Chloride, daily maximum | 2010 mg/L | ≤ 2000 mg/L | 1% |
| December 2025 | Pass/Fail Static 48Hr Acute Daphnia Magna, 48-hour maximum | 1 pass=0;fail=1 | ≤ 0 pass=0;fail=1 | — |
| June 2026 | Pass/Fail Static 48Hr Acute Daphnia Magna, 48-hour maximum | 1 pass=0;fail=1 | ≤ 0 pass=0;fail=1 | — |
| June 2026 | Pass/Fail Static 96 Hr Acute Pimephales Promelas, 96-hour value | 1 pass=0;fail=1 | ≤ 0 pass=0;fail=1 | — |
| Parameter | Statistic | Limit | Months | Outfall |
|---|---|---|---|---|
| Specific conductance | daily maximum | ≤ 7500 umho/cm | all year | 001 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 001 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 001 |
| Nitrogen, 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 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 001 |
| Sulfate, total [as SO4] | daily maximum | ≤ 3000 mg/L | all year | 001 |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | 001 |
| Radium 226, total | daily maximum | ≤ 60 pCi/L | all year | 001 |
| Chloride | daily maximum | ≤ 2000 mg/L | all year | 001 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | 001 |
| Flow | daily maximum | report only (MGD) | all year | 001 |
| Flow | daily maximum | report only (MGD) | all year | 001 |
| Flow | monthly average | report only (MGD) | all year | 001 |
| Flow | monthly average | report only (MGD) | all year | 001 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 001 |
| Pass/Fail Static 48Hr Acute Daphnia Magna | 48-hour maximum | ≤ 0 pass=0;fail=1 | all year | 001 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | ≤ 0 pass=0;fail=1 | all year | 001 |
| Specific conductance | daily maximum | ≤ 7500 umho/cm | all year | 002 |
| pH | instantaneous minimum | ≥ 6.5 SU | all year | 002 |
| pH | instantaneous maximum | ≤ 9 SU | all year | 002 |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Nitrite + Nitrate total [as N] | daily maximum | report only (mg/L) | all year | 002 |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Sulfide, total [as S] | daily maximum | report only (ug/L) | all year | 002 |
| Sulfate, total [as SO4] | daily maximum | ≤ 3000 mg/L | all year | 002 |
| Phosphate, ortho [as P] | daily maximum | report only (mg/L) | all year | 002 |
| Radium 226, total | daily maximum | ≤ 60 pCi/L | all year | 002 |
| Chloride | daily maximum | ≤ 2000 mg/L | all year | 002 |
| Nitrogen, Ammonia Total | daily maximum | report only (mg/L) | all year | 002 |
| Flow | daily maximum | report only (MGD) | all year | 002 |
| Flow | daily maximum | report only (MGD) | all year | 002 |
| Flow | monthly average | report only (MGD) | all year | 002 |
| Flow | monthly average | report only (MGD) | all year | 002 |
| Produced water, oil and grease | daily maximum | ≤ 10 mg/L | all year | 002 |
| Pass/Fail Static 48Hr Acute Ceriodaphnia dubia | 48-hour maximum | ≤ 0 pass=0;fail=1 | all year | 002 |
| Pass/Fail Static 96 Hr Acute Pimephales Promelas | 96-hour value | ≤ 0 pass=0;fail=1 | all year | 002 |
| pH | instantaneous maximum | report only (SU) | all year | DMP1 |
| pH | instantaneous minimum | report only (SU) | all year | DMP1 |
| Sulfide, total [as S] | daily maximum | report only (mg/L) | all year | DMP1 |
| Chloride | daily maximum | report only (mg/L) | all year | DMP1 |
Cited limits by parameter: Wyoming's rules and the federal ones.
Same industry: the 209 Oil and Gas Extraction permits in Wyoming.
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Your permit document is the final word. As JSON: /api/v1/permits/WY0000256 · MCP: https://passage-data.com/mcp