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Town of Ekalaka

Sewage treatment plant, Ekalaka, Montana. NPDES permit MT0020371, in force until Nov 30, 2026. Last 12 months: over a limit 10 times (last July 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (18 values), form S twice a year
Renewal application due
Jun 3, 2026 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
6 values over a limit, 0 required values missing, 1 of 14 reports late

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

Period endingParameterReportedLimitOver by
May 2026BOD, 5-day, 20 deg. C, maximum weekly average112.89 lb/d≤ 19.1 lb/d491%
May 2026Solids, total suspended, monthly average69.38 lb/d≤ 42.5 lb/d63%
May 2026Solids, total suspended, maximum weekly average627.16 lb/d≤ 57.4 lb/d993%
June 2026BOD, 5-day, 20 deg. C, monthly average32.34 lb/d≤ 12.8 lb/d153%
June 2026BOD, 5-day, 20 deg. C, maximum weekly average203.16 lb/d≤ 19.1 lb/d964%
June 2026Solids, total suspended, monthly average152.47 lb/d≤ 42.5 lb/d259%
June 2026Solids, total suspended, maximum weekly average957.76 lb/d≤ 57.4 lb/d1569%
July 2026BOD, 5-day, 20 deg. C, maximum weekly average19.25 lb/d≤ 19.1 lb/d1%
July 2026Solids, total suspended, monthly average113 mg/L≤ 100 mg/L13%
July 2026Solids, total suspended, maximum weekly average127.98 lb/d≤ 57.4 lb/d123%

Limits in force (22)

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≤ 12.8 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 19.1 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≤ 100 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 42.5 lb/dall year
Solids, total suspendedmaximum weekly average≤ 57.4 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil & Greasemaximum≤ 10 mg/Lall year
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLApr–Oct
E. coli, MTEC-MFmonthly geometric mean≤ 630 #/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmaximum 7-day geometric mean≤ 252 #/100mLApr–Oct
E. coli, MTEC-MFmaximum weekly average≤ 1260 #/100mLJan, Feb, Mar, Nov, Dec
Durationtotalreport only (d/mo)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Oil and grease visualvaluereport only (Y=0;N=1)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/MT0020371 · MCP: https://passage-data.com/mcp