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City of Red Lodge

Sewage treatment plant, major discharger, Red Lodge, Montana. NPDES permit MT0020478, in force until Apr 30, 2027. 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 (25 values), form Q quarterly (1 value), form SW twice a year
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 18 reports late

Limits in force (30)

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. Cmaximum 7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 153 lb/dall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 230 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum daily averagereport only (mg/L)all year
pHweekly minimum≥ 6 SUall year
pHweekly maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 45 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 65 mg/Lall year
Solids, total suspendedmonthly average≤ 450 lb/dall year
Solids, total suspendedmaximum 7-day average≤ 650 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendeddaily maximumreport only (mg/L)all year
Oil and grease, hexane extr methodinstantaneous maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
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-MFweekly geometric mean≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFweekly geometric mean≤ 252 CFU/100mLApr–Oct
BOD, 5-day, percent removalminimum≥ 65 %all year
Solids, suspended percent removalminimum≥ 65 %all year
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiasingle samplereport only (pass=0;fail=1)all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelassingle samplereport only (pass=0;fail=1)all year

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/MT0020478 · MCP: https://passage-data.com/mcp