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City of Fort Benton

Sewage treatment plant, Fort Benton, Montana. NPDES permit MT0021601 expired Oct 31, 2026. Last 12 months: no values over a limit, 12 of 40 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (23 values), outfall 001 form A2 monthly (2 values), outfall 002 form A monthly (23 values), outfall 001 form S twice a year, outfall 002 form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
4 values over a limit, 0 required values missing, 10 of 40 reports late

Limits in force (54)

ParameterStatisticLimitMonthsOutfall
Flow ratemonthly averagereport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 64 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 96 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHdaily minimum≥ 6 SUall year001
pHmonthly averagereport only (SU)all year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 45 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall year001
Solids, total suspendedmonthly average≤ 96 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 138 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Oil and grease, hexane extr methodmonthly averagereport only (mg/L)all year001
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct001
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec001
E. coli, MTEC-MFdaily maximum≤ 252 CFU/100mLApr–Oct001
E. coli, MTEC-MFdaily maximum≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Flow ratemonthly averagereport only (MGD)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cdaily maximum≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly geometric mean≤ 64 lb/dall year002
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 96 lb/dall year002
pHdaily minimum≥ 6 SUall year002
pHmonthly averagereport only (SU)all year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 45 mg/Lall year002
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall year002
Solids, total suspendedmonthly average≤ 96 lb/dall year002
Solids, total suspendedmaximum weekly average≤ 138 lb/dall year002
Oil and grease, hexane extr methodmonthly averagereport only (mg/L)all year002
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year002
Nitrogen, total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year002
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year002
Phosphorus, total [as P]monthly averagereport only (mg/L)all year002
Arsenic, total recoverablemonthly averagereport only (ug/L)all year002
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec002
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct002
E. coli, MTEC-MFdaily maximum≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec002
E. coli, MTEC-MFdaily maximum≤ 252 CFU/100mLApr–Oct002
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year002
Solids, suspended percent removalmonthly average minimum≥ 65 %all year002

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/MT0021601 · MCP: https://passage-data.com/mcp