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Montpelier, City of

Sewage treatment plant, Montpelier, Idaho. NPDES permit ID0025585 expired Feb 28, 2025; its limits still apply. Last 12 months: no values over a limit, 4 required values missing, 1 of 4 reports late. Source: EPA ECHO, Oct 22, 2026.

Last report on file
May 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 4 reports late

Limits in force (74)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)May, Oct001
Temperature, water deg. centigrademaximum daily averagereport only (deg C)May, Oct001
Temperature, water deg. centigrademonthly averagereport only (deg C)Apr001
Temperature, water deg. centigrademaximum daily averagereport only (deg C)Apr001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LMay, Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LMay, Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 125 lb/dMay, Oct001
BOD, 5-day, 20 deg. Cweekly average≤ 187 lb/dMay, Oct001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/LApr001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/LApr001
BOD, 5-day, 20 deg. Cmonthly average≤ 125 lb/dApr001
BOD, 5-day, 20 deg. Cweekly average≤ 187 lb/dApr001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)May, Oct001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)Apr001
pHinstantaneous minimum≥ 6.5 SUMay, Oct001
pHinstantaneous maximum≤ 9 SUMay, Oct001
pHinstantaneous minimum≥ 6.5 SUApr001
pHinstantaneous maximum≤ 9 SUApr001
Solids, total suspendedmonthly average≤ 30 mg/LMay, Oct001
Solids, total suspendedweekly average≤ 45 mg/LMay, Oct001
Solids, total suspendedmonthly average≤ 95 lb/dMay, Oct001
Solids, total suspendedweekly average≤ 187 lb/dMay, Oct001
Solids, total suspendedmonthly average≤ 30 mg/LApr001
Solids, total suspendedweekly average≤ 45 mg/LApr001
Solids, total suspendedmonthly average≤ 95 lb/dApr001
Solids, total suspendedweekly average≤ 187 lb/dApr001
Solids, total suspendedmonthly averagereport only (mg/L)May, Oct001
Solids, total suspendedmonthly averagereport only (mg/L)Apr001
Solids, total suspendedannual average≤ 41 lb/dOct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)May001
Nitrogen, ammonia total [as N]monthly average≤ 7 mg/LOct001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May001
Nitrogen, ammonia total [as N]daily maximum≤ 29 mg/LOct001
Nitrogen, ammonia total [as N]monthly average≤ 29 lb/dOct001
Nitrogen, ammonia total [as N]daily maximum≤ 120 lb/dOct001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Apr001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Apr001
Phosphorus, total [as P]monthly average≤ 16.1 lb/dMay, Oct001
Phosphorus, total [as P]monthly average≤ 16.1 lb/dApr001
Phosphorus, total [as P]annual average≤ 9.71 lb/dOct001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLMay, Oct001
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)May, Oct001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr001
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)Apr001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)May, Oct001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)May, Oct001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)Apr001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)Apr001
Chlorine, total residualmonthly averagereport only (mg/L)May, Oct001
Chlorine, total residualdaily maximumreport only (mg/L)May, Oct001
Chlorine, total residualmonthly averagereport only (mg/L)Apr001
Chlorine, total residualdaily maximumreport only (mg/L)Apr001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %May, Oct001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %Apr001
Solids, suspended percent removalmonthly average minimum≥ 85 %May, Oct001
Solids, suspended percent removalmonthly average minimum≥ 85 %Apr001
Temperature, water deg. centigrademonthly averagereport only (deg C)May, OctREC1
Temperature, water deg. centigrademonthly averagereport only (deg C)AprREC1
Temperature, water deg. centigrademaximum daily averagereport only (deg C)May, OctREC1
Temperature, water deg. centigrademaximum daily averagereport only (deg C)AprREC1
pHinstantaneous minimumreport only (SU)May, OctREC1
pHinstantaneous minimumreport only (SU)AprREC1
pHinstantaneous maximumreport only (SU)May, OctREC1
pHinstantaneous maximumreport only (SU)AprREC1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)May, OctREC1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)AprREC1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)May, OctREC1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)AprREC1
Phosphorus, total [as P]monthly averagereport only (mg/L)May, OctREC1
Phosphorus, total [as P]monthly averagereport only (ug/L)AprREC1
Phosphorus, total [as P]daily maximumreport only (mg/L)May, OctREC1
Phosphorus, total [as P]daily maximumreport only (ug/L)AprREC1
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)May, OctREC1
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)AprREC1

How strict are these limits?

Cited limits by parameter: Idaho'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/ID0025585 · MCP: https://passage-data.com/mcp