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City of Choteau

Sewage treatment plant, Choteau, Montana. NPDES permit MT0020052 expired Aug 31, 2026; its limits still apply. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values), form A2 monthly (10 values), form S1 twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 26 reports late

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Flow ratedaily minimumreport only (MGD)all year
Flow ratedaily maximumreport only (MGD)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. Cweekly maximum≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 120 lb/dall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 180 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly maximum≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 120 lb/dall year
Solids, total suspendedweekly maximum≤ 180 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil & Greasemonthly maximum≤ 10 mg/Lall year
Oil & Greasemonthly maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)Jun–Sep
Nitrogen, total [as N]daily maximumreport only (mg/L)Jun–Sep
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Jun–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrite + Nitrate total [as N]daily maximumreport 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
Phosphorus, total [as P]daily maximumreport only (mg/L)Jun–Sep
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 252 #/100mLApr–Oct
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Oil and grease visualvaluereport only (Y=0;N=1)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/MT0020052 · MCP: https://passage-data.com/mcp