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Hinsdale Water and Sewer District

Sewage treatment plant, Hinsdale, Montana. NPDES permit MT0020656 expired Jul 31, 2026; 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 (37 values), form P1 monthly (4 values), form Q quarterly (6 values), form S1 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 6 required values missing, 11 of 30 reports late

Limits in force (50)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademaximum weekly averagereport only (deg C)all year
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. 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≤ 7.5 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 11.3 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
pHminimumreport only (SU)all year
pHmaximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 7.5 lb/dall year
Solids, total suspendedmaximum weekly average≤ 11.3 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedmaximum weekly 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]maximum weekly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)Jul–Sep
Nitrogen, total [as N]maximum weekly averagereport only (lb/d)Jul–Sep
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]maximum weekly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]maximum weekly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]maximum weekly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]quarterly maximumreport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (lb/d)Jul–Sep
Phosphorus, total [as P]maximum weekly averagereport only (lb/d)Jul–Sep
Hardness, total [as CaCO3]quarterly averagereport only (mg/L)all year
Hardness, total [as CaCO3]quarterly maximumreport only (mg/L)all year
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmaximum weekly average≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum weekly average≤ 252 #/100mLApr–Oct
BOD, carbonaceous, 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0020656 · MCP: https://passage-data.com/mcp