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Town of Twin Bridges

Sewage treatment plant, Twin Bridges, Montana. NPDES permit MT0028797 expired Nov 30, 2025; its limits still apply. Last 12 months: no values over a limit, 1 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values), form Q quarterly (2 values), form Q1 quarterly (2 values), form UP quarterly (3 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 25 reports late

Limits in force (43)

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. Cweekly maximum≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 16 lb/dall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 24 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 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 suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 16 lb/dall year
Solids, total suspendeddaily maximum≤ 24 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methodmonthly maximumreport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Nitrogen, total [as N]monthly average≤ 9 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)all year
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Phosphorus, total [as P]monthly average≤ 3 lb/dJul–Sep
Phosphorus, total [as P]monthly averagereport only (lb/d)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Iron, total recoverablemonthly maximumreport only (ug/L)all year
Lead, total recoverablemonthly maximumreport only (ug/L)all year
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum weekly average≤ 252 #/100mLApr–Oct
E. coli, MTEC-MFmaximum weekly average≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
Durationtotalreport only (d/mo)all year
BOD, 5-day, percent removalmonthly minimum≥ 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/MT0028797 · MCP: https://passage-data.com/mcp