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City of Manhattan

Sewage treatment plant, Manhattan, Montana. NPDES permit MT0021857 expired Aug 31, 2015; its limits still apply. Last 12 months: no values over a limit, 4 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values), form Q quarterly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
12 values over a limit, 0 required values missing, 0 of 16 reports late

Limits in force (32)

ParameterStatisticLimitMonths
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. C7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 63 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 95 lb/dall year
BOD, 5-day, 20 deg. Csingle samplereport only (mg/L)all year
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspended7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 100 lb/dall year
Solids, total suspended7-day average≤ 150 lb/dall year
Solids, total suspendedsingle samplereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]single samplereport only (mg/L)all year
Nitrogen, total [as N]single samplereport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]7-day average≤ 17 mg/Lall year
Nitrogen, ammonia total [as N]30-day average≤ 21.5 lb/dall year
Nitrogen, Kjeldahl, total [as N]single samplereport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximum≤ 10 mg/Lall year
Phosphorus, total [as P]single samplereport only (mg/L)all year
Phosphorus, total [as P]single samplereport only (lb/d)all year
E. coli, MTEC-MF30-day average≤ 126 CFU/100mLApr, May, Jun, Jul, Aug, Sep, Oct, Dec
E. coli, MTEC-MF30-day average≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF7-day average≤ 252 CFU/100mLApr, May, Jun, Jul, Aug, Sep, Oct, Dec
E. coli, MTEC-MF7-day average≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0021857 · MCP: https://passage-data.com/mcp