Slate Refining, LLC — NPDES permit WYS000018: limits, due date and EPA's record

Petroleum Refining, Douglas, Wyoming. NPDES permit WYS000018, in force until Sep 30, 2027. Last 12 months: no values over a limit, 4 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Limits in force (46)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. centigrade	instantaneous maximum	≤ 30 deg C	all year	001
BOD, 5-day, 20 deg. C	daily maximum	≤ 48 mg/L	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 26 mg/L	all year	001
pH	instantaneous minimum	≥ 6.5 SU	all year	001
pH	instantaneous minimum	≥ 6.5 SU	all year	001
pH	instantaneous maximum	≤ 9 SU	all year	001
pH	instantaneous maximum	≤ 9 SU	all year	001
Solids, total suspended	daily maximum	≤ 33 mg/L	all year	001
Solids, total suspended	monthly average	≤ 21 mg/L	all year	001
Carbon, tot organic [TOC]	daily maximum	≤ 110 mg/L	all year	001
Chromium, total [as Cr]	daily maximum	≤ .6 mg/L	all year	001
Chromium, total [as Cr]	monthly average	≤ .21 mg/L	all year	001
Chromium, hexavalent dissolved [as Cr]	daily maximum	≤ .016 mg/L	all year	001
Flow, total	daily maximum	report only (Mgal)	all year	001
Flow, total	daily maximum	report only (Mgal)	all year	001
Flow, total	monthly average	report only (Mgal)	all year	001
Phenolic compounds, total	daily maximum	≤ .35 mg/L	all year	001
Phenolic compounds, total	monthly average	≤ .17 mg/L	all year	001
Chemical Oxygen Demand [COD]	daily maximum	≤ 360 mg/L	all year	001
Chemical Oxygen Demand [COD]	monthly average	≤ 180 mg/L	all year	001
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year	001
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year	001
Produced water, oil and grease	monthly average	≤ 8 mg/L	all year	001
Temperature, water deg. centigrade	instantaneous maximum	≤ 30 deg C	all year	002
BOD, 5-day, 20 deg. C	daily maximum	≤ 48 mg/L	all year	002
BOD, 5-day, 20 deg. C	monthly average	≤ 26 mg/L	all year	002
pH	instantaneous minimum	≥ 6.5 SU	all year	002
pH	instantaneous minimum	≥ 6.5 SU	all year	002
pH	instantaneous maximum	≤ 9 SU	all year	002
pH	instantaneous maximum	≤ 9 SU	all year	002
Solids, total suspended	daily maximum	≤ 33 mg/L	all year	002
Solids, total suspended	monthly average	≤ 21 mg/L	all year	002
Carbon, tot organic [TOC]	daily maximum	≤ 110 mg/L	all year	002
Chromium, total [as Cr]	daily maximum	≤ .6 mg/L	all year	002
Chromium, total [as Cr]	monthly average	≤ .21 mg/L	all year	002
Chromium, hexavalent dissolved [as Cr]	daily maximum	≤ .016 mg/L	all year	002
Flow, total	daily maximum	report only (Mgal)	all year	002
Flow, total	daily maximum	report only (Mgal)	all year	002
Flow, total	monthly average	report only (Mgal)	all year	002
Phenolic compounds, total	daily maximum	≤ .35 mg/L	all year	002
Phenolic compounds, total	monthly average	≤ .17 mg/L	all year	002
Chemical Oxygen Demand [COD]	daily maximum	≤ 360 mg/L	all year	002
Chemical Oxygen Demand [COD]	monthly average	≤ 180 mg/L	all year	002
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year	002
Produced water, oil and grease	daily maximum	≤ 10 mg/L	all year	002
Produced water, oil and grease	monthly average	≤ 8 mg/L	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/WYS000018 · MCP: https://passage-data.com/mcp