Contango Resources, LLC — NPDES permit WY0002445: limits, due date and EPA's record

NPDES permit WY0002445 · Minor FEDERAL · effective, expires 2029-12-31 · EPA's file as of 2026-09-19

EPA's record, 2025-09-01 to 2026-08-31

Last period with anything received: 2026-06-30. Most often over: Produced water, oil and grease (1).

Reporting

Reports are due about 119 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (259)

Outfall	Parameter	Statistic	Limit	Months
001	pH	INST MIN	>= 6.5 SU	all year
001	pH	INST MIN	>= 6.5 SU	all year
001	pH	INST MAX	<= 9 SU	all year
001	pH	INST MAX	<= 9 SU	all year
001	Sulfide, total [as S]	DAILY MX	report only	all year
001	Sulfide, total [as S]	DAILY MX	report only	all year
001	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
001	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
001	Chloride	DAILY MX	<= 2000 mg/L	all year
001	Duration	MO TOTAL	report only	all year
001	Duration	MO TOTAL	report only	all year
001	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
001	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
001	Solids, total dissolved	DAILY MX	report only	all year
001	Solids, total dissolved	DAILY MX	report only	all year
001	Solids, total dissolved	MO AVG	report only	all year
001	Solids, total dissolved	MO AVG	report only	all year
001	Solids, total dissolved	MY	report only	all year
001	Solids, total dissolved	MY	report only	all year
001	Flow	DAILY MX	report only	all year
001	Flow	DAILY MX	report only	all year
001	Flow	MO AVG	report only	all year
001	Flow	MO AVG	report only	all year
001	Flow	ANNL TOT	report only	all year
001	Flow	ANNL TOT	report only	all year
001	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
001	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
002	pH	INST MIN	>= 6.5 SU	all year
002	pH	INST MIN	>= 6.5 SU	all year
002	pH	INST MAX	<= 9 SU	all year
002	pH	INST MAX	<= 9 SU	all year
002	Sulfide, total [as S]	DAILY MX	report only	all year
002	Sulfide, total [as S]	DAILY MX	report only	all year
002	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
002	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
002	Chloride	DAILY MX	<= 2000 mg/L	all year
002	Duration	MO TOTAL	report only	all year
002	Duration	MO TOTAL	report only	all year
002	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
002	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Solids, total dissolved	DAILY MX	report only	all year
002	Solids, total dissolved	MO AVG	report only	all year
002	Solids, total dissolved	MO AVG	report only	all year
002	Solids, total dissolved	MY	report only	all year
002	Solids, total dissolved	MY	report only	all year
002	Flow	DAILY MX	report only	all year
002	Flow	DAILY MX	report only	all year
002	Flow	MO AVG	report only	all year
002	Flow	MO AVG	report only	all year
002	Flow	ANNL TOT	report only	all year
002	Flow	ANNL TOT	report only	all year
002	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
002	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
003	pH	INST MIN	>= 6.5 SU	all year
003	pH	INST MIN	>= 6.5 SU	all year
003	pH	INST MAX	<= 9 SU	all year
003	pH	INST MAX	<= 9 SU	all year
003	Sulfide, total [as S]	DAILY MX	report only	all year
003	Sulfide, total [as S]	DAILY MX	report only	all year
003	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
003	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
003	Chloride	DAILY MX	<= 2000 mg/L	all year
003	Duration	MO TOTAL	report only	all year
003	Duration	MO TOTAL	report only	all year
003	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
003	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
003	Solids, total dissolved	DAILY MX	report only	all year
003	Solids, total dissolved	DAILY MX	report only	all year
003	Solids, total dissolved	MO AVG	report only	all year
003	Solids, total dissolved	MO AVG	report only	all year
003	Solids, total dissolved	MY	report only	all year
003	Solids, total dissolved	MY	report only	all year
003	Flow	DAILY MX	report only	all year
003	Flow	DAILY MX	report only	all year
003	Flow	MO AVG	report only	all year
003	Flow	MO AVG	report only	all year
003	Flow	ANNL TOT	report only	all year
003	Flow	ANNL TOT	report only	all year
003	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
003	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
004	pH	INST MIN	>= 6.5 SU	all year
004	pH	INST MIN	>= 6.5 SU	all year
004	pH	INST MAX	<= 9 SU	all year
004	pH	INST MAX	<= 9 SU	all year
004	Sulfide, total [as S]	DAILY MX	report only	all year
004	Sulfide, total [as S]	DAILY MX	report only	all year
004	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
004	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
004	Chloride	DAILY MX	<= 2000 mg/L	all year
004	Duration	MO TOTAL	report only	all year
004	Duration	MO TOTAL	report only	all year
004	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
004	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
004	Solids, total dissolved	DAILY MX	report only	all year
004	Solids, total dissolved	DAILY MX	report only	all year
004	Solids, total dissolved	MO AVG	report only	all year
004	Solids, total dissolved	MO AVG	report only	all year
004	Solids, total dissolved	MY	report only	all year
004	Solids, total dissolved	MY	report only	all year
004	Flow	DAILY MX	report only	all year
004	Flow	DAILY MX	report only	all year
004	Flow	MO AVG	report only	all year
004	Flow	MO AVG	report only	all year
004	Flow	ANNL TOT	report only	all year
004	Flow	ANNL TOT	report only	all year
004	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
004	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
005	pH	INST MIN	>= 6.5 SU	all year
005	pH	INST MIN	>= 6.5 SU	all year
005	pH	INST MAX	<= 9 SU	all year
005	pH	INST MAX	<= 9 SU	all year
005	Sulfide, total [as S]	DAILY MX	report only	all year
005	Sulfide, total [as S]	DAILY MX	report only	all year
005	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
005	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
005	Chloride	DAILY MX	<= 2000 mg/L	all year
005	Duration	MO TOTAL	report only	all year
005	Duration	MO TOTAL	report only	all year
005	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
005	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
005	Solids, total dissolved	DAILY MX	report only	all year
005	Solids, total dissolved	DAILY MX	report only	all year
005	Solids, total dissolved	MY	report only	all year
005	Solids, total dissolved	MY	report only	all year
005	Flow	DAILY MX	report only	all year
005	Flow	DAILY MX	report only	all year
005	Flow	MO AVG	report only	all year
005	Flow	MO AVG	report only	all year
005	Flow	ANNL TOT	report only	all year
005	Flow	ANNL TOT	report only	all year
005	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
005	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
006	pH	INST MIN	>= 6.5 SU	all year
006	pH	INST MIN	>= 6.5 SU	all year
006	pH	INST MAX	<= 9 SU	all year
006	pH	INST MAX	<= 9 SU	all year
006	Sulfide, total [as S]	DAILY MX	report only	all year
006	Sulfide, total [as S]	DAILY MX	report only	all year
006	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
006	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
006	Chloride	DAILY MX	<= 2000 mg/L	all year
006	Duration	MO TOTAL	report only	all year
006	Duration	MO TOTAL	report only	all year
006	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
006	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
006	Solids, total dissolved	DAILY MX	report only	all year
006	Solids, total dissolved	DAILY MX	report only	all year
006	Solids, total dissolved	MY	report only	all year
006	Solids, total dissolved	MY	report only	all year
006	Flow	DAILY MX	report only	all year
006	Flow	DAILY MX	report only	all year
006	Flow	MO AVG	report only	all year
006	Flow	MO AVG	report only	all year
006	Flow	ANNL TOT	report only	all year
006	Flow	ANNL TOT	report only	all year
006	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
006	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
007	pH	INST MIN	>= 6.5 SU	all year
007	pH	INST MIN	>= 6.5 SU	all year
007	pH	INST MAX	<= 9 SU	all year
007	pH	INST MAX	<= 9 SU	all year
007	Sulfide, total [as S]	DAILY MX	report only	all year
007	Sulfide, total [as S]	DAILY MX	report only	all year
007	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
007	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
007	Chloride	DAILY MX	<= 2000 mg/L	all year
007	Duration	DAILY MX	report only	all year
007	Duration	DAILY MX	report only	all year
007	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
007	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
007	Solids, total dissolved	DAILY MX	report only	all year
007	Solids, total dissolved	DAILY MX	report only	all year
007	Solids, total dissolved	MY	report only	all year
007	Solids, total dissolved	MY	report only	all year
007	Flow	DAILY MX	report only	all year
007	Flow	DAILY MX	report only	all year
007	Flow	MO AVG	report only	all year
007	Flow	MO AVG	report only	all year
007	Flow	ANNL TOT	report only	all year
007	Flow	ANNL TOT	report only	all year
007	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
007	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
008	pH	INST MIN	>= 6.5 SU	all year
008	pH	INST MIN	>= 6.5 SU	all year
008	pH	INST MAX	<= 9 SU	all year
008	pH	INST MAX	<= 9 SU	all year
008	Sulfide, total [as S]	DAILY MX	report only	all year
008	Sulfide, total [as S]	DAILY MX	report only	all year
008	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
008	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
008	Chloride	DAILY MX	<= 2000 mg/L	all year
008	Duration	MO TOTAL	report only	all year
008	Duration	MO TOTAL	report only	all year
008	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
008	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
008	Solids, total dissolved	DAILY MX	report only	all year
008	Solids, total dissolved	DAILY MX	report only	all year
008	Solids, total dissolved	MY	report only	all year
008	Solids, total dissolved	MY	report only	all year
008	Flow	DAILY MX	report only	all year
008	Flow	DAILY MX	report only	all year
008	Flow	MO AVG	report only	all year
008	Flow	MO AVG	report only	all year
008	Flow	ANNL TOT	report only	all year
008	Flow	ANNL TOT	report only	all year
008	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
008	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
009	pH	INST MIN	>= 6.5 SU	all year
009	pH	INST MIN	>= 6.5 SU	all year
009	pH	INST MAX	<= 9 SU	all year
009	pH	INST MAX	<= 9 SU	all year
009	Sulfide, total [as S]	DAILY MX	report only	all year
009	Sulfide, total [as S]	DAILY MX	report only	all year
009	Sulfate, total [as SO4]	DAILY MX	<= 3000 mg/L	all year
009	Radium 226, total	DAILY MX	<= 60 pCi/L	all year
009	Chloride	DAILY MX	<= 2000 mg/L	all year
009	Duration	MO TOTAL	report only	all year
009	Duration	MO TOTAL	report only	all year
009	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
009	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
009	Solids, total dissolved	DAILY MX	report only	all year
009	Solids, total dissolved	DAILY MX	report only	all year
009	Solids, total dissolved	MY	report only	all year
009	Solids, total dissolved	MY	report only	all year
009	Flow	DAILY MX	report only	all year
009	Flow	DAILY MX	report only	all year
009	Flow	MO AVG	report only	all year
009	Flow	MO AVG	report only	all year
009	Flow	ANNL TOT	report only	all year
009	Flow	ANNL TOT	report only	all year
009	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
009	Produced water, oil and grease	DAILY MX	<= 10 mg/L	all year
DMP1	pH	INST MIN	report only	all year
DMP1	pH	INST MIN	report only	all year
DMP1	pH	INST MAX	report only	all year
DMP1	pH	INST MAX	report only	all year
DMP1	Sulfide, total [as S]	DAILY MX	report only	all year
DMP1	Sulfide, total [as S]	DAILY MX	report only	all year
DMP1	Chloride	DAILY MX	report only	all year
DMP1	Chloride	DAILY MX	report only	all year
DMP1	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
DMP1	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
DMP1	Solids, total dissolved	DAILY MX	report only	all year
DMP1	Solids, total dissolved	DAILY MX	report only	all year
SUM	Solids, total dissolved	ANNL TOT	<= 100000 ton/yr	all year
SUM	Flow, total	ANNL TOT	report only	all year
UMP1	pH	INST MIN	report only	all year
UMP1	pH	INST MIN	report only	all year
UMP1	pH	INST MAX	report only	all year
UMP1	pH	INST MAX	report only	all year
UMP1	Sulfide, total [as S]	DAILY MX	report only	all year
UMP1	Sulfide, total [as S]	DAILY MX	report only	all year
UMP1	Chloride	DAILY MX	report only	all year
UMP1	Chloride	DAILY MX	report only	all year
UMP1	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
UMP1	Sulfide-hydrogen sulfide [undissociated]	DAILY MX	report only	all year
UMP1	Solids, total dissolved	DAILY MX	report only	all year
UMP1	Solids, total dissolved	DAILY MX	report only	all year