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City of Superior

Sewage treatment plant, Superior, Montana. NPDES permit MT0020664, in force until Feb 28, 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 (27 values)
Renewal application due
Sep 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
24 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (29)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)all year
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≤ 39 lb/dall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 59 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 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≤ 59 lb/dall year
Solids, total suspendedmaximum 7-day average≤ 85 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)Jun–Sep
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 averagereport only (mg/L)Jun–Sep
Phosphorus, total [as P]monthly averagereport only (lb/d)Jun–Sep
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFdaily maximum≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MFdaily maximum≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
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/MT0020664 · MCP: https://passage-data.com/mcp