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City of Sidney MT

Sewage treatment plant, Sidney, Montana. NPDES permit MT0021849 expired Feb 28, 2019; 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 (24 values), form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 14 reports late

Limits in force (29)

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. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 350 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 525 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
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 350 lb/dall year
Solids, total suspendedweekly average≤ 525 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methodsingle grab samplereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (mg/L)Aug–Oct
Nitrogen, total [as N]monthly average≤ 311 lb/dAug–Oct
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Aug–Oct
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Aug–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)Aug–Oct
Phosphorus, total [as P]monthly average≤ 47.5 lb/dAug–Oct
Lead, total recoverablesingle grab samplereport only (ug/L)all year
Chromium, total recoverablesingle grab samplereport only (ug/L)all year
Copper, total recoverablesingle grab samplereport only (ug/L)all year
E. coli, MTEC-MFmonthly averagereport only (CFU/100mL)all year
Solids, total dissolved [TDS]single grab samplereport only (mg/L)all year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %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/MT0021849 · MCP: https://passage-data.com/mcp