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Highwood County Water and Sewer District

Sewage treatment plant, Highwood, Montana. NPDES permit MT0022080 expired Sep 30, 2023; its limits still apply. Last 12 months: over a limit once (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (26 values), form Q quarterly (5 values), form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 4 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
June 2026Solids, suspended percent removal, monthly minimum80.3 %≥ 85 %31%

Limits in force (34)

ParameterStatisticLimitMonths
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≤ 6.3 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 9.7 lb/dall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport 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≤ 6.3 lb/dall year
Solids, total suspendedmaximum weekly average≤ 9.7 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly average≤ 2.6 lb/dJul–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, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly average≤ .73 lb/dJul–Sep
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 252 CFU/100mLApr–Oct
Durationtotalreport only (d/mo)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalmonthly minimum≥ 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/MT0022080 · MCP: https://passage-data.com/mcp