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City of Boulder

Sewage treatment plant, Boulder, Montana. NPDES permit MT0023078 expired Nov 30, 2025; its limits still apply. Last 12 months: no values over a limit, 7 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (36 values), outfall RIV form A monthly (4 values), outfall 001 form S1 twice a year
Last report on file
August 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 8 of 17 reports late

Limits in force (49)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. fahrenheitvaluereport only (deg F)all year001
Flow ratemonthly averagereport only (MGD)all year001
Flow ratedaily maximumreport only (MGD)all year001
Flow ratemonthly averagereport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 lb/dall year001
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 68 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmaximum weekly averagereport only (mg/L)all year001
pHminimum≥ 6 SUall year001
pHmaximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 45 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 68 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Solids, total suspendedmaximum weekly averagereport only (mg/L)all year001
Oil & Greasedaily maximum≤ 10 mg/Lall year001
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep001
Nitrogen, total [as N]daily maximumreport only (mg/L)Jul–Sep001
Nitrogen, total [as N]monthly averagereport only (lb/d)Jul–Sep001
Nitrogen, ammonia total [as N]monthly average≤ 10.1 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 20.2 mg/Lall year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep001
Phosphorus, total [as P]daily maximumreport only (mg/L)Jul–Sep001
Phosphorus, total [as P]monthly averagereport only (lb/d)Jul–Sep001
Hardness, total [as CaCO3]valuereport only (mg/L)all year001
Arsenic, total recoverablevaluereport only (ug/L)all year001
Iron, total recoverablevaluereport only (ug/L)all year001
Zinc, total recoverablevaluereport only (ug/L)all year001
Cadmium, total recoverablevaluereport only (ug/L)all year001
Lead, total recoverablevaluereport only (ug/L)all year001
Copper, total recoverablevaluereport only (ug/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct001
E. coli, MTEC-MFmaximum weekly average≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec001
E. coli, MTEC-MFmaximum weekly average≤ 252 #/100mLApr–Oct001
BOD, 5-day, percent removalminimum≥ 85 %all year001
Solids, suspended percent removalminimum≥ 85 %all year001
Oil and grease visualvaluereport only (Y=0;N=1)all year001
Nitrogen, total [as N]valuereport only (mg/L)Jul–SepRIV
Nitrogen, Kjeldahl, total [as N]valuereport only (mg/L)Jul–SepRIV
Nitrite + Nitrate total [as N]valuereport only (mg/L)Jul–SepRIV
Phosphorus, total [as P]valuereport only (mg/L)Jul–SepRIV

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/MT0023078 · MCP: https://passage-data.com/mcp