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Town of Columbus

Sewage treatment plant, Columbus, Montana. NPDES permit MT0031801, in force until Oct 31, 2028. Last 12 months: over a limit 7 times (last September 2026), 1 of 37 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (14 values), outfall 001 form Q1 quarterly (7 values), outfall 001 form Q2 quarterly (4 values), outfall 001B form A monthly (5 values), outfall 001 form Y yearly, outfall 001B form S1 twice a year, and 1 more form
Last report on file
September 2026
Oct 2024 – Sep 2025
11 values over a limit, 0 required values missing, 0 of 33 reports late

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

Period endingParameterReportedLimitOver by
October 2025E. coli, MTEC-MF, weekly geometric mean488 #/100mL≤ 252 #/100mL94%
January 2026E. coli, MTEC-MF, weekly geometric mean2420 #/100mL≤ 1260 #/100mL92%
March 2026Solids, suspended percent removal, monthly average minimum48.3 %≥ 65 %48%
May 2026pH, daily maximum9.3 SU≤ 9 SU—
June 2026Solids, suspended percent removal, monthly average minimum44.7 %≥ 65 %58%
August 2026pH, daily maximum9.3 SU≤ 9 SU—
September 2026pH, daily maximum9.3 SU≤ 9 SU—

Limits in force (38)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradequarterly averagereport only (deg C) (alert, not enforceable)all year001
Flow ratemonthly averagereport only (MGD)all year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
pHquarterly minimumreport only (SU)all year001
pHquarterly maximumreport only (SU)all year001
Solids, total suspendedmonthly average≤ 100 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 135 mg/Lall year001
Solids, total suspendedmonthly average≤ 209 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 304 lb/dall year001
Solids, total suspendedquarterly averagereport only (mg/L)all year001
Oil and grease, hexane extr methodannual maximum≤ 10 mg/Lall year001
Nitrogen, ammonia total [as N]quarterly averagereport only (mg/L)all year001
Nitrite + Nitrate total [as N]quarterly averagereport only (mg/L)all year001
Nickel, total recoverablequarterly averagereport only (ug/L)all year001
Copper, total recoverablequarterly averagereport 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-MFweekly geometric mean≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec001
E. coli, MTEC-MFweekly geometric mean≤ 252 #/100mLApr–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 60 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 52 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 135 lb/dall year001
BOD, carbonaceous [5 day, 20 C]quarterly averagereport only (mg/L)all year001
BOD, carbonaceous, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Oil and grease visualvaluereport only (N=0;Y=1)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep001B
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001B
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep001B
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jul–Sep001B
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep001B
Iron, total recoverablevaluereport only (ug/L)all year001B
Nickel, total recoverablevaluereport only (ug/L)all year001B
Copper, total recoverablevaluereport only (ug/L)all year001B
Pass/Fail Static Renewal 48Hr Acute Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year001B
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvalue≤ 0 pass=0;fail=1all year001B

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/MT0031801 · MCP: https://passage-data.com/mcp