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Contango Resources, LLC

Federal facility (Crude Petroleum And Natural Gas), (Unknown City), Wyoming. NPDES permit WY0002445, in force until Dec 31, 2029. Last 12 months: over a limit once (last February 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 119 days after each period: outfall 001 form MA yearly (6 values), outfall 001 form MS twice a year (8 values), outfall 002 form MA yearly (6 values), outfall 002 form MS twice a year (8 values), outfall 003 form MA yearly (6 values), outfall 003 form MS twice a year (8 values), and 35 more forms
Last report on file
June 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 5 of 285 reports late

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

Period endingParameterReportedLimitOver by
February 2026Produced water, oil and grease, daily maximum31 mg/L≤ 10 mg/L210%

Limits in force (259)

ParameterStatisticLimitMonthsOutfall
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≤ 60 pCi/Lall year001
Chloridedaily maximum≤ 2000 mg/Lall year001
Durationmonthly totalreport only (d/mo)all year001
Durationmonthly totalreport only (d/mo)all year001
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year001
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolveddaily maximumreport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolvedmonthly averagereport only (mg/L)all year001
Solids, total dissolvedmonthly loadreport only (ton/mo)all year001
Solids, total dissolvedmonthly loadreport only (ton/mo)all 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
Flowannual totalreport only (MGD)all year001
Flowannual totalreport 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 year002
pHinstantaneous minimum≥ 6.5 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
pHinstantaneous maximum≤ 9 SUall year002
Sulfide, total [as S]daily maximumreport only (ug/L)all year002
Sulfide, total [as S]daily maximumreport only (ug/L)all year002
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year002
Radium 226, totaldaily maximum≤ 60 pCi/Lall year002
Chloridedaily maximum≤ 2000 mg/Lall year002
Durationmonthly totalreport only (d/mo)all year002
Durationmonthly totalreport only (d/mo)all year002
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year002
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year002
Solids, total dissolveddaily maximumreport only (mg/L)all year002
Solids, total dissolveddaily maximumreport only (mg/L)all year002
Solids, total dissolvedmonthly averagereport only (mg/L)all year002
Solids, total dissolvedmonthly averagereport only (mg/L)all year002
Solids, total dissolvedmonthly loadreport only (ton/mo)all year002
Solids, total dissolvedmonthly loadreport only (ton/mo)all year002
Flowdaily maximumreport only (MGD)all year002
Flowdaily maximumreport only (MGD)all year002
Flowmonthly averagereport only (MGD)all year002
Flowmonthly averagereport only (MGD)all year002
Flowannual totalreport only (MGD)all year002
Flowannual totalreport only (MGD)all year002
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year002
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year002
pHinstantaneous minimum≥ 6.5 SUall year003
pHinstantaneous minimum≥ 6.5 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
pHinstantaneous maximum≤ 9 SUall year003
Sulfide, total [as S]daily maximumreport only (ug/L)all year003
Sulfide, total [as S]daily maximumreport only (ug/L)all year003
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year003
Radium 226, totaldaily maximum≤ 60 pCi/Lall year003
Chloridedaily maximum≤ 2000 mg/Lall year003
Durationmonthly totalreport only (d/mo)all year003
Durationmonthly totalreport only (d/mo)all year003
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year003
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year003
Solids, total dissolveddaily maximumreport only (mg/L)all year003
Solids, total dissolveddaily maximumreport only (mg/L)all year003
Solids, total dissolvedmonthly averagereport only (mg/L)all year003
Solids, total dissolvedmonthly averagereport only (mg/L)all year003
Solids, total dissolvedmonthly loadreport only (ton/mo)all year003
Solids, total dissolvedmonthly loadreport only (ton/mo)all year003
Flowdaily maximumreport only (MGD)all year003
Flowdaily maximumreport only (MGD)all year003
Flowmonthly averagereport only (MGD)all year003
Flowmonthly averagereport only (MGD)all year003
Flowannual totalreport only (MGD)all year003
Flowannual totalreport only (MGD)all year003
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year003
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year003
pHinstantaneous minimum≥ 6.5 SUall year004
pHinstantaneous minimum≥ 6.5 SUall year004
pHinstantaneous maximum≤ 9 SUall year004
pHinstantaneous maximum≤ 9 SUall year004
Sulfide, total [as S]daily maximumreport only (ug/L)all year004
Sulfide, total [as S]daily maximumreport only (ug/L)all year004
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year004
Radium 226, totaldaily maximum≤ 60 pCi/Lall year004
Chloridedaily maximum≤ 2000 mg/Lall year004
Durationmonthly totalreport only (d/mo)all year004
Durationmonthly totalreport only (d/mo)all year004
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year004
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year004
Solids, total dissolveddaily maximumreport only (mg/L)all year004
Solids, total dissolveddaily maximumreport only (mg/L)all year004
Solids, total dissolvedmonthly averagereport only (mg/L)all year004
Solids, total dissolvedmonthly averagereport only (mg/L)all year004
Solids, total dissolvedmonthly loadreport only (ton/mo)all year004
Solids, total dissolvedmonthly loadreport only (ton/mo)all year004
Flowdaily maximumreport only (MGD)all year004
Flowdaily maximumreport only (MGD)all year004
Flowmonthly averagereport only (MGD)all year004
Flowmonthly averagereport only (MGD)all year004
Flowannual totalreport only (MGD)all year004
Flowannual totalreport only (MGD)all year004
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year004
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year004
pHinstantaneous minimum≥ 6.5 SUall year005
pHinstantaneous minimum≥ 6.5 SUall year005
pHinstantaneous maximum≤ 9 SUall year005
pHinstantaneous maximum≤ 9 SUall year005
Sulfide, total [as S]daily maximumreport only (ug/L)all year005
Sulfide, total [as S]daily maximumreport only (ug/L)all year005
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year005
Radium 226, totaldaily maximum≤ 60 pCi/Lall year005
Chloridedaily maximum≤ 2000 mg/Lall year005
Durationmonthly totalreport only (d/mo)all year005
Durationmonthly totalreport only (d/mo)all year005
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year005
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year005
Solids, total dissolveddaily maximumreport only (mg/L)all year005
Solids, total dissolveddaily maximumreport only (mg/L)all year005
Solids, total dissolvedmonthly loadreport only (ton/mo)all year005
Solids, total dissolvedmonthly loadreport only (ton/mo)all year005
Flowdaily maximumreport only (MGD)all year005
Flowdaily maximumreport only (MGD)all year005
Flowmonthly averagereport only (MGD)all year005
Flowmonthly averagereport only (MGD)all year005
Flowannual totalreport only (MGD)all year005
Flowannual totalreport only (MGD)all year005
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year005
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year005
pHinstantaneous minimum≥ 6.5 SUall year006
pHinstantaneous minimum≥ 6.5 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
pHinstantaneous maximum≤ 9 SUall year006
Sulfide, total [as S]daily maximumreport only (ug/L)all year006
Sulfide, total [as S]daily maximumreport only (ug/L)all year006
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year006
Radium 226, totaldaily maximum≤ 60 pCi/Lall year006
Chloridedaily maximum≤ 2000 mg/Lall year006
Durationmonthly totalreport only (d/mo)all year006
Durationmonthly totalreport only (d/mo)all year006
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year006
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year006
Solids, total dissolveddaily maximumreport only (mg/L)all year006
Solids, total dissolveddaily maximumreport only (mg/L)all year006
Solids, total dissolvedmonthly loadreport only (ton/mo)all year006
Solids, total dissolvedmonthly loadreport only (ton/mo)all year006
Flowdaily maximumreport only (MGD)all year006
Flowdaily maximumreport only (MGD)all year006
Flowmonthly averagereport only (MGD)all year006
Flowmonthly averagereport only (MGD)all year006
Flowannual totalreport only (MGD)all year006
Flowannual totalreport only (MGD)all year006
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year006
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year006
pHinstantaneous minimum≥ 6.5 SUall year007
pHinstantaneous minimum≥ 6.5 SUall year007
pHinstantaneous maximum≤ 9 SUall year007
pHinstantaneous maximum≤ 9 SUall year007
Sulfide, total [as S]daily maximumreport only (ug/L)all year007
Sulfide, total [as S]daily maximumreport only (ug/L)all year007
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year007
Radium 226, totaldaily maximum≤ 60 pCi/Lall year007
Chloridedaily maximum≤ 2000 mg/Lall year007
Durationdaily maximumreport only (d/mo)all year007
Durationdaily maximumreport only (d/mo)all year007
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year007
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year007
Solids, total dissolveddaily maximumreport only (mg/L)all year007
Solids, total dissolveddaily maximumreport only (mg/L)all year007
Solids, total dissolvedmonthly loadreport only (ton/mo)all year007
Solids, total dissolvedmonthly loadreport only (ton/mo)all year007
Flowdaily maximumreport only (MGD)all year007
Flowdaily maximumreport only (MGD)all year007
Flowmonthly averagereport only (MGD)all year007
Flowmonthly averagereport only (MGD)all year007
Flowannual totalreport only (MGD)all year007
Flowannual totalreport only (MGD)all year007
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year007
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year007
pHinstantaneous minimum≥ 6.5 SUall year008
pHinstantaneous minimum≥ 6.5 SUall year008
pHinstantaneous maximum≤ 9 SUall year008
pHinstantaneous maximum≤ 9 SUall year008
Sulfide, total [as S]daily maximumreport only (ug/L)all year008
Sulfide, total [as S]daily maximumreport only (ug/L)all year008
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year008
Radium 226, totaldaily maximum≤ 60 pCi/Lall year008
Chloridedaily maximum≤ 2000 mg/Lall year008
Durationmonthly totalreport only (d/mo)all year008
Durationmonthly totalreport only (d/mo)all year008
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year008
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year008
Solids, total dissolveddaily maximumreport only (mg/L)all year008
Solids, total dissolveddaily maximumreport only (mg/L)all year008
Solids, total dissolvedmonthly loadreport only (ton/mo)all year008
Solids, total dissolvedmonthly loadreport only (ton/mo)all year008
Flowdaily maximumreport only (MGD)all year008
Flowdaily maximumreport only (MGD)all year008
Flowmonthly averagereport only (MGD)all year008
Flowmonthly averagereport only (MGD)all year008
Flowannual totalreport only (MGD)all year008
Flowannual totalreport only (MGD)all year008
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year008
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year008
pHinstantaneous minimum≥ 6.5 SUall year009
pHinstantaneous minimum≥ 6.5 SUall year009
pHinstantaneous maximum≤ 9 SUall year009
pHinstantaneous maximum≤ 9 SUall year009
Sulfide, total [as S]daily maximumreport only (ug/L)all year009
Sulfide, total [as S]daily maximumreport only (ug/L)all year009
Sulfate, total [as SO4]daily maximum≤ 3000 mg/Lall year009
Radium 226, totaldaily maximum≤ 60 pCi/Lall year009
Chloridedaily maximum≤ 2000 mg/Lall year009
Durationmonthly totalreport only (d/mo)all year009
Durationmonthly totalreport only (d/mo)all year009
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year009
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all year009
Solids, total dissolveddaily maximumreport only (mg/L)all year009
Solids, total dissolveddaily maximumreport only (mg/L)all year009
Solids, total dissolvedmonthly loadreport only (ton/mo)all year009
Solids, total dissolvedmonthly loadreport only (ton/mo)all year009
Flowdaily maximumreport only (MGD)all year009
Flowdaily maximumreport only (MGD)all year009
Flowmonthly averagereport only (MGD)all year009
Flowmonthly averagereport only (MGD)all year009
Flowannual totalreport only (MGD)all year009
Flowannual totalreport only (MGD)all year009
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year009
Produced water, oil and greasedaily maximum≤ 10 mg/Lall year009
pHinstantaneous minimumreport only (SU)all yearDMP1
pHinstantaneous minimumreport only (SU)all yearDMP1
pHinstantaneous maximumreport only (SU)all yearDMP1
pHinstantaneous maximumreport only (SU)all yearDMP1
Sulfide, total [as S]daily maximumreport only (ug/L)all yearDMP1
Sulfide, total [as S]daily maximumreport only (ug/L)all yearDMP1
Chloridedaily maximumreport only (mg/L)all yearDMP1
Chloridedaily maximumreport only (mg/L)all yearDMP1
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all yearDMP1
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all yearDMP1
Solids, total dissolveddaily maximumreport only (mg/L)all yearDMP1
Solids, total dissolveddaily maximumreport only (mg/L)all yearDMP1
Solids, total dissolvedannual total≤ 100000 ton/yrall yearSUM
Flow, totalannual totalreport only (MGD)all yearSUM
pHinstantaneous minimumreport only (SU)all yearUMP1
pHinstantaneous minimumreport only (SU)all yearUMP1
pHinstantaneous maximumreport only (SU)all yearUMP1
pHinstantaneous maximumreport only (SU)all yearUMP1
Sulfide, total [as S]daily maximumreport only (ug/L)all yearUMP1
Sulfide, total [as S]daily maximumreport only (ug/L)all yearUMP1
Chloridedaily maximumreport only (mg/L)all yearUMP1
Chloridedaily maximumreport only (mg/L)all yearUMP1
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all yearUMP1
Sulfide-hydrogen sulfide [undissociated]daily maximumreport only (ug/L)all yearUMP1
Solids, total dissolveddaily maximumreport only (mg/L)all yearUMP1
Solids, total dissolveddaily maximumreport only (mg/L)all yearUMP1

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/WY0002445 · MCP: https://passage-data.com/mcp