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City of Laurel

Sewage treatment plant, Laurel, Montana. NPDES permit MT0030261, in force until Oct 31, 2027. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (15 values)
Renewal application due
May 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (15)

ParameterStatisticLimitMonths
Flow ratemonthly averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 40 lb/dall year
Solids, total suspendeddaily maximum≤ 60 lb/dall year
Aluminum, dissolved [as Al]monthly average≤ .3 mg/Lall year
Aluminum, dissolved [as Al]daily maximum≤ .8 mg/Lall year
Aluminum, dissolved [as Al]monthly average≤ .7 lb/dall year
Aluminum, dissolved [as Al]daily maximum≤ 1.8 lb/dall year
Durationvaluereport only (d/mo)all year
Chlorine, total residualmonthly average≤ .0999 mg/Lall year
Chlorine, total residualdaily maximum≤ .0999 mg/Lall year

How strict are these limits?

Cited limits by parameter: Montana's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MT0030261 · MCP: https://passage-data.com/mcp