Slate Refining, LLC

NPDES permit WYS000018 · Minor NON-POTW · effective, expires 2027-09-30 · 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)
4of 16 forms filed late

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

Reporting

Reports are due about 28 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (46)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeINST MAX <= 30 deg C all year
001BOD, 5-day, 20 deg. CDAILY MX <= 48 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 26 mg/L all year
001pHINST MIN >= 6.5 SU all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedDAILY MX <= 33 mg/L all year
001Solids, total suspendedMO AVG <= 21 mg/L all year
001Carbon, tot organic [TOC]DAILY MX <= 110 mg/L all year
001Chromium, total [as Cr]DAILY MX <= .6 mg/L all year
001Chromium, total [as Cr]MO AVG <= .21 mg/L all year
001Chromium, hexavalent dissolved [as Cr]DAILY MX <= .016 mg/L all year
001Flow, totalDAILY MX report only all year
001Flow, totalDAILY MX report only all year
001Flow, totalMO AVG report only all year
001Phenolic compounds, totalDAILY MX <= .35 mg/L all year
001Phenolic compounds, totalMO AVG <= .17 mg/L all year
001Chemical Oxygen Demand [COD]DAILY MX <= 360 mg/L all year
001Chemical Oxygen Demand [COD]MO AVG <= 180 mg/L all year
001Produced water, oil and greaseDAILY MX <= 10 mg/L all year
001Produced water, oil and greaseDAILY MX <= 10 mg/L all year
001Produced water, oil and greaseMO AVG <= 8 mg/L all year
002Temperature, water deg. centigradeINST MAX <= 30 deg C all year
002BOD, 5-day, 20 deg. CDAILY MX <= 48 mg/L all year
002BOD, 5-day, 20 deg. CMO AVG <= 26 mg/L all year
002pHINST MIN >= 6.5 SU all year
002pHINST MIN >= 6.5 SU all year
002pHINST MAX <= 9 SU all year
002pHINST MAX <= 9 SU all year
002Solids, total suspendedDAILY MX <= 33 mg/L all year
002Solids, total suspendedMO AVG <= 21 mg/L all year
002Carbon, tot organic [TOC]DAILY MX <= 110 mg/L all year
002Chromium, total [as Cr]DAILY MX <= .6 mg/L all year
002Chromium, total [as Cr]MO AVG <= .21 mg/L all year
002Chromium, hexavalent dissolved [as Cr]DAILY MX <= .016 mg/L all year
002Flow, totalDAILY MX report only all year
002Flow, totalDAILY MX report only all year
002Flow, totalMO AVG report only all year
002Phenolic compounds, totalDAILY MX <= .35 mg/L all year
002Phenolic compounds, totalMO AVG <= .17 mg/L all year
002Chemical Oxygen Demand [COD]DAILY MX <= 360 mg/L all year
002Chemical Oxygen Demand [COD]MO AVG <= 180 mg/L all year
002Produced water, oil and greaseDAILY MX <= 10 mg/L all year
002Produced water, oil and greaseDAILY MX <= 10 mg/L all year
002Produced water, oil and greaseMO AVG <= 8 mg/L 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