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Town of Denton

Sewage treatment plant, Denton, Montana. NPDES permit MT0022462 expired Feb 28, 2025; its limits still apply. Last 12 months: no values over a limit, 40 required values missing, 6 of 16 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (26 values), form Q quarterly (3 values), form S twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
22 values over a limit, 0 required values missing, 11 of 18 reports late

Limits in force (32)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily minimumreport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport 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. Cweekly maximum≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 11 lb/dall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 16.5 lb/dall year
BOD, 5-day, 20 deg. Cquarterly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 45 mg/Lall year
Solids, total suspendedweekly maximum≤ 65 mg/Lall year
Solids, total suspendedmonthly average≤ 16.5 lb/dall year
Solids, total suspendedweekly maximum≤ 23.9 lb/dall year
Solids, total suspendedquarterly averagereport only (mg/L)all year
Oil & Greasemaximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly average≤ 4.32 lb/dJul–Sep
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly average≤ .6 lb/dJul–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-MFweekly average≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MFweekly average≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
Durationmonthly totalreport only (d/mo)all year
BOD, 5-day, percent removalmonthly minimum≥ 85 %all year
Solids, suspended percent removalmonthly minimum≥ 65 %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/MT0022462 · MCP: https://passage-data.com/mcp