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City of Havre

Sewage treatment plant, major discharger, Havre, Montana. NPDES permit MT0022535 expired Aug 31, 2026; its limits still apply. Last 12 months: no values over a limit, 7 of 24 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (33 values), form A2 monthly (3 values), form Q quarterly (9 values), form Q1 quarterly (1 value), form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 2 of 28 reports late

Limits in force (50)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Temperature, water deg. centigrademinimumreport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 450 lb/dall year
Solids, total suspendedmaximum weekly average≤ 676 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil & Greasemonthly maximum≤ 10 mg/Lall year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)Jun–Sep
Nitrogen, total [as N]single samplereport only (mg/L)Jun–Sep
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]single samplereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jun–Sep
Nitrogen, Kjeldahl, total [as N]single samplereport only (mg/L)Jun–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]single samplereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jun–Sep
Phosphorus, total [as P]monthly averagereport only (lb/d)Jun–Sep
Phosphorus, total [as P]single samplereport only (mg/L)Jun–Sep
Hardness, total [as CaCO3]single samplereport only (ug/L)all year
Selenium, total recoverablemonthly averagereport only (ug/L)all year
Selenium, total recoverablesingle samplereport only (ug/L)all year
Copper, total recoverablemonthly averagereport only (ug/L)all year
Copper, total recoverablesingle samplereport only (ug/L)all year
E. coli, MTEC-MFmonthly geometric meanreport only (#/100mL)Jan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmaximum weekly averagereport only (#/100mL)Jan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum weekly average≤ 252 #/100mLApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year
BOD, carbonaceous [5 day, 20 C]monthly average≤ 375 lb/dall year
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 600 lb/dall year
BOD, carbonaceous [5 day, 20 C]monthly averagereport only (mg/L)all year
BOD, carbonaceous, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Oil and grease visualvaluereport only (Y=0;N=1)all year
Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 7Day Chronic Pimephales promelasvalue≤ 0 pass=0;fail=1all 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/MT0022535 · MCP: https://passage-data.com/mcp