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Stockett Water and Sewer Dist

Sewage treatment plant, Stockett, Montana. NPDES permit MT0030091 expired Aug 31, 2024; its limits still apply. Last 12 months: over a limit 6 times (last April 2026), 1 of 15 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values), form Q quarterly (5 values), form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
April 2026BOD, 5-day, 20 deg. C, 7-day average110 mg/L≤ 65 mg/L69%
April 2026BOD, 5-day, 20 deg. C, monthly average110 mg/L≤ 45 mg/L144%
April 2026BOD, 5-day, 20 deg. C, monthly average17.3 lb/d≤ 8.5 lb/d104%
April 2026Solids, total suspended, 7-day average173 mg/L≤ 135 mg/L28%
April 2026Solids, total suspended, monthly average173 mg/L≤ 100 mg/L73%
April 2026pH, instantaneous maximum9.3 SU≤ 9 SU—

Limits in force (27)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 65 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 8.5 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 18.4 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous minimumreport only (SU)all year
pHinstantaneous maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspended7-day average≤ 135 mg/Lall year
Solids, total suspendedmonthly average≤ 28.4 lb/dall year
Solids, total suspended7-day average≤ 38.3 lb/dall year
Oil and grease, hexane extr methoddaily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]minimumreport only (mg/L)all year
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF7-day average≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MF7-day average≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
Durationtotalreport only (d/mo)all year
BOD, 5-day, percent removalminimum≥ 65 %all year
Oil and grease visualvaluereport only (Y=0;N=1)all year

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/MT0030091 · MCP: https://passage-data.com/mcp