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University of Montana

Sewage treatment plant, Polson, Montana. NPDES permit MT0023388 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit 2 times (last December 2025), 3 required values missing, 2 of 10 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A quarterly (23 values), form Y yearly
Last report on file
June 2026
Oct 2024 – Sep 2025
6 values over a limit, 29 required values missing, 11 of 13 reports late

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

Period endingParameterReportedLimitOver by
December 2025Phosphorus, total [as P], annual total10.5 lb/yr≤ 2 lb/yr425%
December 2025Phosphorus, total [as P], annual total10.5 lb/yr≤ 2 lb/yr425%

Limits in force (33)

ParameterStatisticLimitMonths
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/mo)all year
Nitrogen, total [as N]daily maximumreport only (lb/mo)all year
Nitrogen, total [as N]annual total≤ 154 lb/yrall year
Nitrogen, total [as N]monthly totalreport only (lb/mo)all year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]30-day averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/mo)all year
Phosphorus, total [as P]daily maximumreport only (lb/mo)all year
Phosphorus, total [as P]annual total≤ 2 lb/yrall year
Phosphorus, total [as P]monthly totalreport only (lb/mo)all year
Floating solids, waste or visible foam-visualinstantaneous maximum≤ 0 N=0;Y=1all year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
E. coli30-day average≤ 32 #/100mLall year
E. colidaily maximum≤ 50 #/100mLall 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/MT0023388 · MCP: https://passage-data.com/mcp