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Chevron Environmental Management Company

Nonclassifiable Establishments, Evansville, Wyoming. NPDES permit WY0036412, in force until Apr 30, 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 (11 values)
Last report on file: September 2026
Oct 2024 – Sep 2025: 0 values over a limit, 33 required values missing, 3 of 11 reports late

Limits in force (11)

Parameter	Statistic	Limit	Months
Specific conductance	daily maximum	= 7500 umho/cm	all year
pH	instantaneous minimum	≥ 6.5 SU	all year
pH	instantaneous maximum	≤ 9 SU	all year
Selenium, total recoverable	daily maximum	≤ 15 ug/L	all year
Benzene	daily maximum	≤ 50 ug/L	all year
BTEX	daily maximum	≤ 750 ug/L	all year
Duration	monthly total	report only (d)	all year
Flow	monthly average	report only (MGD)	all year
Flow	daily maximum	report only (MGD)	all year
Hydrocarbons, total petroleum	daily maximum	≤ 10 mg/L	all year
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year

How strict are these limits?

Selenium, total recoverable, daily maximum 15 ug/L — stricter than 44% of 97 other minor industrial and other permits nationwide
Hydrocarbons, total petroleum, daily maximum 10 mg/L — stricter than 25% of 55 other minor industrial and other permits nationwide; 13% have the same limit
Benzene, daily maximum 50 ug/L — stricter than 16% of 336 other minor industrial and other permits nationwide; 32% have the same limit

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/WY0036412 · MCP: https://passage-data.com/mcp