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Bigfork County Water and Sewer

Sewage treatment plant, major discharger, Bigfork, Montana. NPDES permit MT0020397 expired Apr 30, 2023; its limits still apply. Last 12 months: no values over a limit, 2 of 18 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (33 values), form W quarterly (2 values), form M yearly, form UP quarterly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 21 reports late

Limits in force (38)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratedaily averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Flow ratedaily 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 average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 125 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 259 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 125 lb/dall year
Solids, total suspendedweekly average≤ 259 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Oil and grease, hexane extr methodmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly average≤ 42.1 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]monthly average≤ 4.2 lb/dall year
Thallium, total recoverablesingle samplereport only (ug/L)all year
Thallium, total recoverablesingle samplereport only (ug/L)Jun, Dec
Aluminum, dissolved [as Al]monthly averagereport only (ug/L)all year
Aluminum, dissolved [as Al]single samplereport only (ug/L)all year
E. coli, MTEC-MFmonthly geometric mean≤ 32 #/100mLall year
E. coli, MTEC-MFweekly geometric mean≤ 64 #/100mLall year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiavaluereport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvaluereport only (pass=0;fail=1)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/MT0020397 · MCP: https://passage-data.com/mcp