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City of Three Forks

Sewage treatment plant, Three Forks, Montana. NPDES permit MT0020401, in force until Apr 30, 2027. Last 12 months: over a limit once (last May 2026), 1 of 21 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (26 values), outfall 001 form Q quarterly (1 value), outfall 001B form A monthly (2 values), outfall 001B form Q quarterly (5 values), outfall 001 form S1 twice a year
Renewal application due
Nov 1, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 3 required values missing, 6 of 25 reports late

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

Period endingParameterReportedLimitOver by
May 2026Solids, suspended percent removal, minimum> 83.3 %≥ 85 %2%

Limits in force (37)

ParameterStatisticLimitMonthsOutfall
Flow ratemonthly averagereport only (MGD)all year001
Flow ratedaily maximumreport only (MGD)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly maximum≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 113 lb/dall year001
BOD, 5-day, 20 deg. Cweekly maximum≤ 170 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly maximum≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 113 lb/dall year001
Solids, total suspendedweekly maximum≤ 170 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Oil & Greasedaily maximumreport only (mg/L)all year001
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep001
Nitrogen, total [as N]monthly averagereport only (lb/d)Jul–Sep001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (lb/d)all year001
Arsenic, total recoverablemonthly 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, 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
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001B
pHmonthly averagereport only (SU)all year001B
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep001B
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001B
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep001B
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001B
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001B

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/MT0020401 · MCP: https://passage-data.com/mcp