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Town of Bridger

Sewage treatment plant, Bridger, Montana. NPDES permit MT0020303 expired Apr 30, 2024; its limits still apply. Last 12 months: over a limit 2 times (last April 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 8 required values missing, 2 of 15 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, monthly average52.2 mg/L≤ 45 mg/L16%
April 2026BOD, 5-day, 20 deg. C, weekly maximum100 mg/L≤ 65 mg/L54%

Limits in force (31)

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
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 65 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 47 lb/dall year
BOD, 5-day, 20 deg. Cweekly maximum≤ 67 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedweekly maximum≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 103 lb/dall year
Solids, total suspendedweekly maximum≤ 140 lb/dall year
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly average≤ 8 lb/dJul–Sep
Nitrogen, total [as N]weekly maximum≤ 14 lb/dJul–Sep
Nitrogen, ammonia total [as N]monthly average≤ 13.3 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 19.4 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly average≤ 3.2 lb/dJul–Sep
Phosphorus, total [as P]weekly maximum≤ 5.5 lb/dJul–Sep
E. coli, MTEC-MFmonthly average≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmonthly average≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFweekly maximum≤ 252 #/100mLApr–Oct
E. coli, MTEC-MFweekly maximum≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
BOD, 5-day, percent removalminimum≥ 65 %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.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0020303 · MCP: https://passage-data.com/mcp