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Town of Joliet

Sewage treatment plant, Joliet, Montana. NPDES permit MT0020249, in force until Dec 31, 2027. Last 12 months: over a limit 14 times (last May 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values), form A2 monthly (4 values), form S1 twice a year
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
7 values over a limit, 0 required values missing, 0 of 17 reports late

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

All 14 values over a limit
Period endingParameterReportedLimitOver by
December 2025Nitrogen, ammonia total [as N], monthly average8.95 mg/L≤ 5.98 mg/L50%
January 2026Nitrogen, ammonia total [as N], monthly average11.9 mg/L≤ 5.98 mg/L99%
January 2026Solids, suspended percent removal, minimum80 %≥ 85 %33%
February 2026Nitrogen, ammonia total [as N], monthly average16.4 mg/L≤ 5.98 mg/L174%
March 2026Nitrogen, ammonia total [as N], monthly average16.3 mg/L≤ 5.98 mg/L173%
March 2026Solids, suspended percent removal, minimum68 %≥ 85 %113%
March 2026Solids, total suspended, monthly average41.8 mg/L≤ 30 mg/L39%
April 2026Nitrogen, ammonia total [as N], monthly average6.7 mg/L≤ 5.98 mg/L12%
April 2026Solids, suspended percent removal, minimum77 %≥ 85 %53%
April 2026Solids, total suspended, monthly average58.2 mg/L≤ 30 mg/L94%
April 2026Solids, total suspended, maximum weekly average89 mg/L≤ 45 mg/L98%
May 2026Solids, suspended percent removal, minimum67 %≥ 85 %120%
May 2026Solids, total suspended, monthly average68.75 mg/L≤ 30 mg/L129%
May 2026Solids, total suspended, maximum weekly average89 mg/L≤ 45 mg/L98%

Limits in force (32)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 42.5 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 63.8 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 42.5 lb/dall year
Solids, total suspendedmaximum weekly average≤ 63.8 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil & Greasemonthly maximumreport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, total [as N]monthly average≤ 53.04 lb/dJul–Sep
Nitrogen, ammonia total [as N]monthly average≤ 5.98 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Jul–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)Jul–Sep
Phosphorus, total [as P]monthly average≤ 15.35 lb/dJul–Sep
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmaximum weekly average≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum weekly average≤ 252 #/100mLApr–Oct
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all 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/MT0020249 · MCP: https://passage-data.com/mcp