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Par Montana, LLC.

Petroleum Refining, Billings, Montana. NPDES permit MT0028321 expired Jan 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (13 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 4 reports late

Limits in force (13)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (gal/min)Jul–Oct
Flow ratedaily maximumreport only (gal/min)Jul–Oct
Turbiditymonthly averagereport only (NTU)Jul–Oct
Turbiditydaily maximumreport only (NTU)Jul–Oct
Turbiditymonthly averagereport only (NTU) (alert, not enforceable)Jul–Oct
Turbiditydaily maximum≤ 100 NTU (alert, not enforceable)Jul–Oct
Turbiditymonthly averagereport only (NTU)Jul–Oct
Turbiditydaily maximumreport only (NTU)Jul–Oct
pHminimum≥ 6 SUJul–Oct
pHmaximum≤ 9 SUJul–Oct
Oil & Greasemonthly averagereport only (mg/L)Jul–Oct
Oil & Greasedaily maximum≤ 10 mg/LJul–Oct
Oil and grease visualvaluereport only (Y=0;N=1)Jul–Oct

How strict are these limits?

Cited limits by parameter: Montana's rules and the federal ones.

Same industry: the 4 Petroleum Refining and Related Industries permits in Montana.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0028321 · MCP: https://passage-data.com/mcp