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Sun Prairie Village W and S Dist

Sewage treatment plant, Great Falls, Montana. NPDES permit MT0028665 expired Dec 31, 2017; its limits still apply. Last 12 months: over a limit 11 times (last September 2026), 1 of 17 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (30 values), form Q quarterly (1 value), form Y yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
6 values over a limit, 2 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
April 2026pH, instantaneous maximum9.38 SU≤ 9 SU—
May 2026Solids, suspended percent removal, minimum56 %≥ 65 %26%
May 2026Solids, total suspended, monthly average138 mg/L≤ 100 mg/L38%
May 2026Solids, total suspended, weekly average138 mg/L≤ 135 mg/L2%
May 2026pH, instantaneous maximum9.3 SU≤ 9 SU—
June 2026Solids, suspended percent removal, minimum55 %≥ 65 %29%
June 2026pH, instantaneous maximum9.11 SU≤ 9 SU—
July 2026BOD, 5-day, 20 deg. C, monthly average57 mg/L≤ 45 mg/L27%
August 2026E. coli, MTEC-MF, monthly average208 CFU/100mL≤ 126 CFU/100mL65%
August 2026Solids, suspended percent removal, minimum30 %≥ 65 %100%
September 2026Solids, suspended percent removal, minimum28 %≥ 65 %106%

Limits in force (52)

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 (gal/min)all year
Flow ratedaily maximumreport only (gal/min)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 63 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 91 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 71 lb/dall year
BOD, 5-day, 20 deg. Cmonthly average≤ 47 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 102 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 68 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous minimum≥ 5.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHinstantaneous maximum≤ 9.5 SUall year
Solids, total suspendedmonthly average≤ 100 mg/Lall year
Solids, total suspendedmonthly average≤ 140 mg/Lall year
Solids, total suspendedweekly average≤ 135 mg/Lall year
Solids, total suspendedweekly average≤ 189 mg/Lall year
Solids, total suspendedmonthly average≤ 158 lb/dall year
Solids, total suspendedmonthly average≤ 221 lb/dall year
Solids, total suspendedweekly average≤ 213 lb/dall year
Solids, total suspendedweekly average≤ 298 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methodvaluereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)May–Sep
Nitrogen, total [as N]monthly averagereport only (lb/d)May–Sep
Nitrogen, ammonia total [as N]daily average≤ 7.6 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 12.2 mg/Lall year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)May–Sep
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)May–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)May–Sep
Phosphorus, total [as P]monthly averagereport only (lb/d)May–Sep
E. coli, MTEC-MFmonthly average≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFmonthly average≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFmonthly average≤ 151 CFU/100mLApr–Oct
E. coli, MTEC-MFmonthly average≤ 756 CFU/100mLJan, Feb, Nov, Dec
E. coli, MTEC-MFweekly average≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MFweekly average≤ 12660 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFweekly average≤ 302 CFU/100mLApr–Oct
E. coli, MTEC-MFweekly average≤ 1512 CFU/100mLJan, Feb, Nov, Dec
Chlorine, total residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualmonthly average≤ .12 mg/Lall year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .12 mg/Lall year
Solids, total dissolved [TDS]valuereport only (mg/L)all year
BOD, 5-day, percent removalminimum≥ 65 %all year
BOD, 5-day, percent removalminimum≥ 65 %all year
Solids, suspended percent removalminimum≥ 65 %all year
Solids, suspended percent removalminimum≥ 65 %all year

How strict are these limits?

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/MT0028665 · MCP: https://passage-data.com/mcp