Cowboy Clean Fuels, LLC

NPDES permit WY0056839 · Minor NON-POTW · effective, expires 2026-11-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

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

0values over a limit
0required values missing, on 0 form(s)
9of 76 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 45 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (206)

OutfallParameterStatisticLimitMonths
001Specific conductanceDAILY MX <= 7500 umho/cm all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Calcium, dissolved [as Ca]DAILY MX report only all year
001Magnesium, dissolved [as Mg]DAILY MX report only all year
001Sodium, dissolved [as Na]DAILY MX report only all year
001Arsenic, total [as As]DAILY MX <= 8.4 ug/L all year
001Barium, total [as Ba]DAILY MX <= 1800 ug/L all year
001Iron, dissolved [as Fe]DAILY MX <= 1000 ug/L all year
001ChlorideDAILY MX <= 150 mg/L all year
001DurationMO TOTAL report only all year
001Bicarbonate as [CaCO3]DAILY MX report only all year
001FlowMO AVG report only all year
001FlowDAILY MX report only all year
001Pass/Fail Static 48Hr Acute Daphnia Magna4C = 0 pass=0;fail=1 all year
001Pass/Fail Static 96 Hr Acute Pimephales Promelas9D = 0 pass=0;fail=1 all year
002Specific conductanceDAILY MX <= 7500 umho/cm all year
002pHINST MIN >= 6.5 SU all year
002pHINST MAX <= 9 SU all year
002Calcium, dissolved [as Ca]DAILY MX report only all year
002Magnesium, dissolved [as Mg]DAILY MX report only all year
002Sodium, dissolved [as Na]DAILY MX report only all year
002Arsenic, total [as As]DAILY MX <= 8.4 ug/L all year
002Barium, total [as Ba]DAILY MX <= 1800 ug/L all year
002Iron, dissolved [as Fe]DAILY MX <= 1000 ug/L all year
002ChlorideDAILY MX <= 150 mg/L all year
002DurationMO TOTAL report only all year
002Bicarbonate as [CaCO3]DAILY MX report only all year
002FlowMO AVG report only all year
002FlowDAILY MX report only all year
002Pass/Fail Static 48Hr Acute Daphnia Magna4C = 0 pass=0;fail=1 all year
002Pass/Fail Static 96 Hr Acute Pimephales Promelas9D = 0 pass=0;fail=1 all year
003Specific conductanceDAILY MX <= 7500 umho/cm all year
003pHINST MIN >= 6.5 SU all year
003pHINST MAX <= 9 SU all year
003Calcium, dissolved [as Ca]DAILY MX report only all year
003Magnesium, dissolved [as Mg]DAILY MX report only all year
003Sodium, dissolved [as Na]DAILY MX report only all year
003Arsenic, total [as As]DAILY MX <= 8.4 ug/L all year
003Barium, total [as Ba]DAILY MX <= 1800 ug/L all year
003Iron, dissolved [as Fe]DAILY MX <= 1000 ug/L all year
003ChlorideDAILY MX <= 150 mg/L all year
003DurationMO TOTAL report only all year
003Bicarbonate as [CaCO3]DAILY MX report only all year
003FlowMO AVG report only all year
003FlowDAILY MX report only all year
003Pass/Fail Static 48Hr Acute Daphnia Magna4C = 0 pass=0;fail=1 all year
003Pass/Fail Static 96 Hr Acute Pimephales Promelas9D = 0 pass=0;fail=1 all year
004Specific conductanceDAILY MX <= 7500 umho/cm all year
004pHINST MIN >= 6.5 SU all year
004pHINST MAX <= 9 SU all year
004Calcium, dissolved [as Ca]DAILY MX report only all year
004Magnesium, dissolved [as Mg]DAILY MX report only all year
004Sodium, dissolved [as Na]DAILY MX report only all year
004Arsenic, total [as As]DAILY MX <= 8.4 ug/L all year
004Barium, total [as Ba]DAILY MX <= 1800 ug/L all year
004Iron, dissolved [as Fe]DAILY MX <= 1000 ug/L all year
004ChlorideDAILY MX <= 150 mg/L all year
004DurationMO TOTAL report only all year
004Bicarbonate as [CaCO3]DAILY MX report only all year
004FlowMO AVG report only all year
004FlowDAILY MX report only all year
004Pass/Fail Static 48Hr Acute Daphnia Magna4C = 0 pass=0;fail=1 all year
004Pass/Fail Static 96 Hr Acute Pimephales Promelas9D = 0 pass=0;fail=1 all year
005Specific conductanceDAILY MX <= 7500 umho/cm all year
005pHINST MIN >= 6.5 SU all year
005pHINST MAX <= 9 SU all year
005Calcium, dissolved [as Ca]DAILY MX report only all year
005Magnesium, dissolved [as Mg]DAILY MX report only all year
005Sodium, dissolved [as Na]DAILY MX report only all year
005Arsenic, total [as As]DAILY MX <= 8.4 ug/L all year
005Barium, total [as Ba]DAILY MX <= 1800 ug/L all year
005Iron, dissolved [as Fe]DAILY MX <= 1000 ug/L all year
005ChlorideDAILY MX <= 150 mg/L all year
005DurationMO TOTAL report only all year
005Bicarbonate as [CaCO3]DAILY MX report only all year
005FlowMO AVG report only all year
005FlowDAILY MX report only all year
005Pass/Fail Static 48Hr Acute Daphnia Magna4C = 0 pass=0;fail=1 all year
005Pass/Fail Static 96 Hr Acute Pimephales Promelas9D = 0 pass=0;fail=1 all year
006Specific conductanceDAILY MX <= 7500 umho/cm all year
006pHINST MIN >= 6.5 SU all year
006pHINST MAX <= 9 SU all year
006Calcium, dissolved [as Ca]DAILY MX report only all year
006Magnesium, dissolved [as Mg]DAILY MX report only all year
006Sodium, dissolved [as Na]DAILY MX report only all year
006Arsenic, total [as As]DAILY MX <= 8.4 ug/L all year
006Barium, total [as Ba]DAILY MX <= 1800 ug/L all year
006Iron, dissolved [as Fe]DAILY MX <= 1000 ug/L all year
006ChlorideDAILY MX <= 150 mg/L all year
006DurationMO TOTAL report only all year
006Bicarbonate as [CaCO3]DAILY MX report only all year
006FlowMO AVG report only all year
006FlowDAILY MX report only all year
006Pass/Fail Static 48Hr Acute Daphnia Magna4C = 0 pass=0;fail=1 all year
006Pass/Fail Static 96 Hr Acute Pimephales Promelas9D = 0 pass=0;fail=1 all year
DPRSpecific conductanceDAILY MX report only all year
DPRSpecific conductanceDAILY MX report only all year
DPRpHDAILY MX report only all year
DPRpHDAILY MX report only all year
DPRCalcium, dissolved [as Ca]DAILY MX report only all year
DPRCalcium, dissolved [as Ca]DAILY MX report only all year
DPRMagnesium, dissolved [as Mg]DAILY MX report only all year
DPRMagnesium, dissolved [as Mg]DAILY MX report only all year
DPRSodium, dissolved [as Na]DAILY MX report only all year
DPRSodium, dissolved [as Na]DAILY MX report only all year
DPRSodium adsorption ratioDAILY MX report only all year
DPRSodium adsorption ratioDAILY MX report only all year
DPRDepth to water level ft below landsurfaceDAILY MX report only all year
DPRDepth to water level ft below landsurfaceDAILY MX report only all year
R01Specific conductanceDAILY MX report only all year
R01Digester gas, volumeDAILY MX report only all year
R01pHDAILY MN report only all year
R01pHDAILY MX report only all year
R01Calcium, dissolved [as Ca]DAILY MX report only all year
R01Magnesium, dissolved [as Mg]DAILY MX report only all year
R01Sodium, dissolved [as Na]DAILY MX report only all year
R01Sodium adsorption ratioDAILY MX report only all year
R01Bicarbonate as [CaCO3]DAILY MX report only all year
R01SulfateDAILY MX report only all year
R02Specific conductanceDAILY MX report only all year
R02Digester gas, volumeDAILY MX report only all year
R02pHDAILY MN report only all year
R02pHDAILY MX report only all year
R02Calcium, dissolved [as Ca]DAILY MX report only all year
R02Magnesium, dissolved [as Mg]DAILY MX report only all year
R02Sodium, dissolved [as Na]DAILY MX report only all year
R02Sodium adsorption ratioDAILY MX report only all year
R02Bicarbonate as [CaCO3]DAILY MX report only all year
R02SulfateDAILY MX report only all year
R03Specific conductanceDAILY MX report only all year
R03Digester gas, volumeDAILY MX report only all year
R03pHDAILY MN report only all year
R03pHDAILY MX report only all year
R03Calcium, dissolved [as Ca]DAILY MX report only all year
R03Magnesium, dissolved [as Mg]DAILY MX report only all year
R03Sodium, dissolved [as Na]DAILY MX report only all year
R03Sodium adsorption ratioDAILY MX report only all year
R03Bicarbonate as [CaCO3]DAILY MX report only all year
R03SulfateDAILY MX report only all year
R04Specific conductanceDAILY MX report only all year
R04Digester gas, volumeDAILY MX report only all year
R04pHDAILY MN report only all year
R04pHDAILY MX report only all year
R04Calcium, dissolved [as Ca]DAILY MX report only all year
R04Magnesium, dissolved [as Mg]DAILY MX report only all year
R04Sodium, dissolved [as Na]DAILY MX report only all year
R04Sodium adsorption ratioDAILY MX report only all year
R04Bicarbonate as [CaCO3]DAILY MX report only all year
R04SulfateDAILY MX report only all year
R05Specific conductanceDAILY MX report only all year
R05Digester gas, volumeDAILY MX report only all year
R05pHDAILY MN report only all year
R05pHDAILY MX report only all year
R05Calcium, dissolved [as Ca]DAILY MX report only all year
R05Magnesium, dissolved [as Mg]DAILY MX report only all year
R05Sodium, dissolved [as Na]DAILY MX report only all year
R05Sodium adsorption ratioDAILY MX report only all year
R05Bicarbonate as [CaCO3]DAILY MX report only all year
R05SulfateDAILY MX report only all year
R06Specific conductanceDAILY MX report only all year
R06Digester gas, volumeDAILY MX report only all year
R06pHDAILY MN report only all year
R06pHDAILY MX report only all year
R06Calcium, dissolved [as Ca]DAILY MX report only all year
R06Magnesium, dissolved [as Mg]DAILY MX report only all year
R06Sodium, dissolved [as Na]DAILY MX report only all year
R06Sodium adsorption ratioDAILY MX report only all year
R06Bicarbonate as [CaCO3]DAILY MX report only all year
R06SulfateDAILY MX report only all year
TRB1Specific conductanceDAILY MX report only all year
TRB1Specific conductanceDAILY MX report only all year
TRB1pHDAILY MX report only all year
TRB1pHDAILY MX report only all year
TRB1Calcium, dissolved [as Ca]DAILY MX report only all year
TRB1Calcium, dissolved [as Ca]DAILY MX report only all year
TRB1Magnesium, dissolved [as Mg]DAILY MX report only all year
TRB1Magnesium, dissolved [as Mg]DAILY MX report only all year
TRB1Sodium, dissolved [as Na]DAILY MX report only all year
TRB1Sodium, dissolved [as Na]DAILY MX report only all year
TRB1Sodium adsorption ratioDAILY MX report only all year
TRB1Sodium adsorption ratioDAILY MX report only all year
TRB1Priority pollutants scan [yes/no]QRTR AVG report only all year
TRB1Priority pollutants scan [yes/no]SEMI AVG report only all year
TRB1Priority pollutants scan [yes/no]ANNL AVG report only all year
TRB1Priority pollutants scan [yes/no]ANNL AVG report only all year
TRB1Depth to water level ft below landsurfaceDAILY MX report only all year
TRB1Depth to water level ft below landsurfaceDAILY MX report only all year
TRB1FlowDAILY MX report only all year
TRB1FlowDAILY MX report only all year
TRB1FlowMO AVG report only all year
TRB1FlowMO AVG report only all year
UPRSpecific conductanceDAILY MX report only all year
UPRSpecific conductanceDAILY MX report only all year
UPRpHDAILY MX report only all year
UPRpHDAILY MX report only all year
UPRCalcium, dissolved [as Ca]DAILY MX report only all year
UPRCalcium, dissolved [as Ca]DAILY MX report only all year
UPRMagnesium, dissolved [as Mg]DAILY MX report only all year
UPRMagnesium, dissolved [as Mg]DAILY MX report only all year
UPRSodium, dissolved [as Na]DAILY MX report only all year
UPRSodium, dissolved [as Na]DAILY MX report only all year
UPRSodium adsorption ratioDAILY MX report only all year
UPRSodium adsorption ratioDAILY MX report only all year
UPRDepth to water level ft below landsurfaceDAILY MX report only all year
UPRDepth to water level ft below landsurfaceDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states