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City of White Sulphur Springs

Sewage treatment plant, White Sulphur Springs, Montana. NPDES permit MT0020699 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 2 times (last March 2026), 1 required value missing, 6 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (18 values), form Q quarterly (1 value)
Last report on file
August 2026
Oct 2024 – Sep 2025
12 values over a limit, 18 required values missing, 4 of 16 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025pH, maximum9.12 SU≤ 9 SU—
March 2026BOD, 5-day, percent removal, minimum81 %≥ 85 %27%

Limits in force (19)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 45 lb/dall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 68 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly maximumreport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedweekly maximum≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 150 lb/dall year
Solids, total suspendedweekly maximum≤ 203 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly maximumreport only (mg/L)all year
Oil & Greasemaximum≤ 10 mg/Lall year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 65 %all year

How strict are these limits?

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

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0020699 · MCP: https://passage-data.com/mcp