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Hilcorp Energy Company

Crude Petroleum And Natural Gas, Evanston, Wyoming. NPDES permit WY0032697, in force until Mar 31, 2030. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 89 days after each period: form MQ quarterly (18 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 3 of 12 reports late

Limits in force (18)

ParameterStatisticLimitMonths
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendeddaily maximum≤ 90 mg/Lall year
Sulfide, total [as S]daily maximumreport only (ug/L)all year
Sulfide, total [as S]monthly averagereport only (ug/L)all year
Sulfate, total [as SO4]daily maximumreport only (mg/L)all year
Sulfate, total [as SO4]monthly averagereport only (mg/L)all year
Chloridedaily maximumreport only (mg/L)all year
Chloridemonthly averagereport only (mg/L)all year
Durationmonthly totalreport only (d)all year
Solids, total dissolvedmonthly averagereport only (mg/L)all year
Solids, total dissolveddaily maximumreport only (mg/L)all year
Solids, total dissolveddaily maximum≤ 1 ton/dall year
Flowmonthly averagereport only (MGD)all year
Flowdaily maximumreport only (MGD)all year
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year

How strict are these limits?

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/WY0032697 · MCP: https://passage-data.com/mcp