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Town of Belt

Sewage treatment plant, Belt, Montana. NPDES permit MT0021571 expired Jun 30, 2022; its limits still apply. Last 12 months: over a limit once (last March 2026), 37 required values missing, 2 of 13 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (27 values), form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 27 required values missing, 3 of 13 reports late

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

Period endingParameterReportedLimit
March 2026pH, maximum9.36 SU≤ 9 SU

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
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
BOD, 5-day, 20 deg. C30-day average≤ 39 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 58 lb/dall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 45 mg/Lall year
Solids, total suspended7-day average≤ 65 mg/Lall year
Solids, total suspended30-day average≤ 58 lb/dall year
Solids, total suspended7-day average≤ 84 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Oil & Grease30-day averagereport only (mg/L)Jun, Dec
Oil & Greasedaily maximumreport only (mg/L)Jun, Dec
Nitrogen, total [as N]30-day averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]30-day averagereport only (lb/d)Jun–Sep
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day averagereport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)Jun–Sep
Phosphorus, total [as P]30-day averagereport only (lb/d)Jun–Sep
Hardness, total [as CaCO3]annual averagereport only (mg/L)all year
Arsenic, total recoverableannual averagereport only (ug/L)all year
Arsenic, total recoverableannual averagereport only (lb/d)all year
Iron, total recoverableannual averagereport only (ug/L)all year
Iron, total recoverableannual averagereport only (lb/d)all year
Zinc, total recoverableannual averagereport only (ug/L)all year
Zinc, total recoverableannual averagereport only (lb/d)all year
Cadmium, total recoverableannual averagereport only (ug/L)all year
Cadmium, total recoverableannual averagereport only (lb/d)all year
Lead, total recoverableannual averagereport only (ug/L)all year
Lead, total recoverableannual averagereport only (lb/d)all year
E. coli, MTEC-MF30-day average≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF30-day average≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MF7-day average≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF7-day average≤ 252 CFU/100mLApr–Oct
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 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/MT0021571 · MCP: https://passage-data.com/mcp