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Nepeco

Crude Petroleum And Natural Gas, (Unknown City), Wyoming. NPDES permit WY0030589, in force until Oct 31, 2030. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form OB twice a year, outfall 001 form OM twice a year, outfall 001 form OS twice a year, outfall DMP1 form DM twice a year
Last report on file
June 2026
Oct 2024 – Sep 2025
0 values over a limit, 2 required values missing, 0 of 26 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimit
December 2025pH, instantaneous maximum9.8 SU≤ 9 SU

Limits in force (22)

ParameterStatisticLimitMonthsOutfall
Specific conductancedaily maximum≤ 7500 umho/cmall year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Sulfide, total [as S]daily maximumreport only (ug/L)all year001
Sulfide, total [as S]daily maximumreport only (ug/L)all year001
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year001
Radium 226, totaldaily maximum≤ 20 pCi/Lall year001
Chloridedaily maximum≤ 230 mg/Lall year001
Flowdaily maximumreport only (MGD)all year001
Flowdaily maximumreport only (MGD)all year001
Flowmonthly averagereport only (MGD)all year001
Flowmonthly averagereport only (MGD)all year001
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year001
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year001
pHinstantaneous minimum≥ 6.5 SUall yearDMP1
pHinstantaneous minimum≥ 6.5 SUall yearDMP1
pHinstantaneous maximum≤ 9 SUall yearDMP1
pHinstantaneous maximum≤ 9 SUall yearDMP1
Sulfide, total [as S]daily maximumreport only (ug/L)all yearDMP1
Sulfide, total [as S]daily maximumreport only (ug/L)all yearDMP1

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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WY0030589 · MCP: https://passage-data.com/mcp