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City of Cut Bank

Sewage treatment plant, Cut Bank, Montana. NPDES permit MT0020141 expired Feb 28, 2017; its limits still apply. Last 12 months: over a limit 11 times (last August 2026), 2 of 22 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (36 values), form UP monthly (4 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 4 of 24 reports late

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

Period endingParameterReportedLimit
October 2025pH, instantaneous minimum7.32 SU≥ 7.7 SU
November 2025pH, instantaneous minimum7.52 SU≥ 7.7 SU
December 2025pH, instantaneous minimum7.27 SU≥ 7.7 SU
January 2026pH, instantaneous minimum7.36 SU≥ 7.7 SU
February 2026pH, instantaneous minimum7.34 SU≥ 7.7 SU
March 2026pH, instantaneous minimum7.36 SU≥ 7.7 SU
April 2026pH, instantaneous minimum7.55 SU≥ 7.7 SU
May 2026pH, instantaneous minimum6.79 SU≥ 7.7 SU
June 2026pH, instantaneous minimum7.41 SU≥ 7.7 SU
July 2026pH, instantaneous minimum7.35 SU≥ 7.7 SU
August 2026pH, instantaneous minimum7.14 SU≥ 7.7 SU

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheitvaluereport only (deg F)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratevaluereport 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. Cmaximum 7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 161 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 241 lb/dall year
pHinstantaneous minimum≥ 7.7 SUall year
pHvaluereport only (SU)all year
pHinstantaneous maximum≤ 8.8 SUall year
Solids, total suspended30-day average≤ 100 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 135 mg/Lall year
Solids, total suspended30-day average≤ 536 lb/dall year
Solids, total suspendedmaximum 7-day average≤ 724 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]30-day average≤ 19 mg/Lall year
Nitrogen, total [as N]maximum 7-day average≤ 32.6 mg/Lall year
Nitrogen, total [as N]30-day average≤ 101.9 lb/dall year
Nitrogen, total [as N]maximum 7-day average≤ 174.8 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 1 mg/Lall year
Nitrogen, ammonia total [as N]valuereport only (mg/L)all year
Nitrogen, ammonia total [as N]maximum weekly average≤ 2 mg/Lall year
Nitrogen, ammonia total [as N]monthly average≤ 5.4 lb/dall year
Nitrogen, ammonia total [as N]maximum weekly average≤ 10.7 lb/dall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]maximum 7-day averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 5.9 mg/Lall year
Phosphorus, total [as P]maximum weekly average≤ 9 mg/Lall year
Phosphorus, total [as P]monthly average≤ 31.6 lb/dall year
Phosphorus, total [as P]maximum weekly average≤ 48.3 lb/dall year
E. coli, MTEC-MF30-day geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MF30-day geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF7-day geometric mean≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MF7-day geometric mean≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
Chlorine, total residualdaily maximum≤ .11 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Oil and grease visualvaluereport only (N=0;Y=1)all 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/MT0020141 · MCP: https://passage-data.com/mcp