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City of Deer Lodge

Sewage treatment plant, major discharger, Deer Lodge, Montana. NPDES permit MT0022616 expired Feb 28, 2018; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (37 values), form UP quarterly (3 values), form W twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 3 required values missing, 0 of 18 reports late

Limits in force (44)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
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≤ 375 lb/dall year
BOD, 5-day, 20 deg. C7-day average≤ 563 lb/dall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 45 mg/Lall year
Solids, total suspended7-day average≤ 65 mg/Lall year
Solids, total suspended30-day average≤ 563 lb/dall year
Solids, total suspended7-day average≤ 813 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]30-day averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]30-day average≤ 1.2 mg/Lall year
Nitrogen, ammonia total [as N]7-day average≤ 2 mg/Lall year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]30-day averagereport only (lb/d)all year
Cyanide, total [as CN]30-day averagereport only (ug/L)all year
Cyanide, total [as CN]quarterly averagereport only (ug/L)all year
Arsenic, total recoverabledaily maximum≤ 10 ug/Lall year
Copper, total recoverable30-day average≤ 14 ug/Lall year
Copper, total recoverabledaily maximum≤ 28 ug/Lall year
Copper, total recoverablequarterly averagereport only (ug/L)all year
E. coli, MTEC-MF30-day geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MF30-day geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF7-day geometric mean≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MF7-day geometric mean≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
Mercury, total recoverable30-day averagereport only (ug/L)all year
Mercury, total recoverablequarterly averagereport only (ug/L)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 65 %all year
Oil and grease visualvalue≤ 0 N=0;Y=1all year
Pass/Fail Static 48Hr Acute Ceriodaphnia dubiavalue≤ 0 pass=0;fail=1all year
Pass/Fail Static Renewal 96Hr Acute Pimephales Promelasvalue≤ 0 pass=0;fail=1all 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/MT0022616 · MCP: https://passage-data.com/mcp