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City of Whitefish

Sewage treatment plant, major discharger, Whitefish, Montana. NPDES permit MT0020184 expired Jul 31, 2020; its limits still apply. Last 12 months: over a limit 2 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (43 values), form W quarterly (2 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
March 2026Nitrogen, ammonia total [as N], monthly average11.12 mg/L≤ 9.6 mg/L16%
May 2026Nitrogen, ammonia total [as N], monthly average9.74 mg/L≤ 9.6 mg/L1%

Limits in force (52)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jul–Sep
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jul–Sep
Temperature, water deg. fahrenheitmonthly averagereport only (deg F)Jul–Sep
Temperature, water deg. fahrenheitdaily maximumreport only (deg F)Jul–Sep
Flow ratedaily averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Oxygen, dissolved [DO]single samplereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 313 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 676 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 313 lb/dall year
Solids, total suspendedmaximum weekly average≤ 676 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year
Oil and grease, hexane extr methodsingle samplereport only (mg/L)Jun, Dec
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, total [as N]maximumreport only (mg/L)Jul–Sep
Nitrogen, total [as N]weekly maximumreport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, total [as N]monthly average≤ 176 lb/dJul–Sep
Nitrogen, total [as N]monthly average≤ 273 lb/dJan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, total [as N]weekly maximumreport only (lb/d)Jul–Sep
Nitrogen, total [as N]weekly maximumreport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 9.6 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 17.7 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]maximumreport only (mg/L)all year
Phosphorus, total [as P]minimumreport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 10.4 lb/dall year
Aluminum, dissolved [as Al]monthly average≤ 113 ug/Lall year
Aluminum, dissolved [as Al]daily maximum≤ 325 ug/Lall year
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFmaximum≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum≤ 252 CFU/100mLApr–Oct
Chlorine, total residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualmaximum≤ .1 mg/Lall year
BOD, 5-day, percent removalmonthly minimum≥ 85 %all year
Solids, suspended percent removalmonthly minimum≥ 85 %all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasvalue≤ 0 pass=0;fail=1all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0020184 · MCP: https://passage-data.com/mcp