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Vaughn Cascade County Water Sewer District

Sewage treatment plant, Vaughn, Montana. NPDES permit MT0021440 expired Nov 30, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (35 values), form Q quarterly (1 value)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (38)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport 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. Cminimum weekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 22.4 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 33.6 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedminimum weekly averagereport only (mg/L)all year
Solids, total suspendedmonthly average≤ 45 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 65 mg/Lall year
Solids, total suspendedmonthly average≤ 33.6 lb/dall year
Solids, total suspendedmaximum weekly average≤ 48.5 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Oil and grease, hexane extr methodquarterly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)May–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)May–Sep
Nitrogen, ammonia total [as N]monthly average≤ 9.5 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 13 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)May–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)May–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)May–Sep
Phosphorus, total [as P]monthly averagereport only (lb/d)May–Sep
E. coli, MTEC-MFmonthly average≤ 630 MPN/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly average≤ 126 MPN/100mLApr–Oct
E. coli, MTEC-MFweekly average≤ 1260 MPN/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFweekly average≤ 252 MPN/100mLApr–Oct
Chlorine, total residualdaily minimumreport only (mg/L)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall 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/MT0021440 · MCP: https://passage-data.com/mcp