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City of Laurel

Sewage treatment plant, major discharger, Laurel, Montana. NPDES permit MT0020311 expired Mar 31, 2021; 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 (35 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (37)

ParameterStatisticLimitMonths
Temperature, water deg. fahrenheit30-day averagereport only (deg F)all year
Flow rate30-day averagereport only (MGD)all year
Flow rate30-day averagereport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. C30-day average≤ 220 lb/dall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 330 lb/dall year
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Solids, total suspended30-day average≤ 220 lb/dall year
Solids, total suspendedmaximum 7-day average≤ 330 lb/dall year
Solids, total suspended30-day averagereport only (mg/L)all year
Oil and grease, hexane extr method7-day average≤ 10 mg/Lall year
Nitrogen, total [as N]30-day averagereport only (mg/L)all year
Nitrogen, total [as N]30-day average≤ 233 lb/dall year
Nitrogen, total [as N]maximum daily average≤ 363 lb/dall year
Nitrogen, ammonia total [as N]30-day average≤ 2.8 mg/Lall year
Nitrogen, ammonia total [as N]daily maximum≤ 5.6 mg/Lall year
Nitrogen, Kjeldahl, total [as N]30-day averagereport only (mg/L)all year
Nitrite + Nitrate total [as N]30-day average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]daily maximum≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]30-day averagereport only (lb/d)all year
Nitrite + Nitrate total [as N]daily maximumreport only (lb/d)all year
Phosphorus, total [as P]30-day averagereport only (mg/L)all year
Phosphorus, total [as P]30-day average≤ 47 lb/dall year
Phosphorus, total [as P]maximum 7-day average≤ 73 lb/dall year
E. coli, MTEC-MF30-day geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF30-day geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFweekly geometric mean≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MF7-day geometric mean≤ 252 CFU/100mLApr–Oct
Chlorine, total residual30-day average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 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/MT0020311 · MCP: https://passage-data.com/mcp