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Natural Gas Liquids, Riverton, Wyoming. NPDES permit WY0034207 expired Dec 31, 2025; its limits still apply. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.
| Parameter | Statistic | Limit | Months |
|---|---|---|---|
| Temperature, water deg. centigrade | daily maximum | report only (deg C) | all year |
| Sulfate [as S] | daily maximum | report only (mg/L) | all year |
| Oxygen, dissolved [DO] | daily maximum | report only (mg/L) | all year |
| Oxygen, dissolved percent saturation | daily minimum | ≥ 80 % | all year |
| pH | minimum | ≥ 6 SU | all year |
| pH | maximum | ≤ 9 SU | all year |
| Solids, total suspended | 30-day average | ≤ 30 mg/L | all year |
| Solids, total suspended | daily maximum | ≤ 60 mg/L | all year |
| Oil & Grease | daily maximum | ≤ 10 mg/L | all year |
| Nitrogen, total [as N] | daily maximum | report only (mg/L) | all year |
| Phosphorus, total [as P] | daily maximum | report only (mg/L) | all year |
| Solids, total dissolved | 30-day average | ≤ 3940 mg/L | all year |
| Solids, total dissolved | daily maximum | ≤ 5000 mg/L | all year |
| Flow, total | 30-day average | report only (MGD) | all year |
| Flow, total | daily maximum | report only (MGD) | all year |
| Oil and grease visual | instantaneous maximum | report only (N=0;Y=1) | all year |
| Pass/Fail Static Renewal 48Hr Acute Daphnia Species | daily maximum | ≤ 0 pass=0;fail=1 | all year |
| Pass/Fail Static Renewal 96Hr Acute Pimephales Promelas | daily maximum | ≤ 0 pass=0;fail=1 | all year |
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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On EPA ECHO: Facility report · DMR history
Your permit document is the final word. As JSON: /api/v1/permits/WY0034207 · MCP: https://passage-data.com/mcp