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La Grande, City of

Sewage treatment plant, major discharger, La Grande, Oregon. NPDES permit OR0020460 expired Oct 31, 2008; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (21 values)
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 (25)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHdaily minimumreport only (SU)all year
pHdaily maximumreport only (SU)all year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly averagereport only (mg/L)all year
Chlorine, total residualdaily maximumreport only (mg/L)all year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colisingle sample≤ 406 #/100mLall year
E. colilog meanreport only (#/100mL)all year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 406 #/100mLall year
E. colilog mean≤ 126 #/100mLall year
E. colidaily maximumreport only (#/100mL)all year
Detention timeminimum≥ 4320 minall year
Detention timeminimum≥ 3 dall year
Detention timeminimum≥ 3 dall year
Chlorine usagemonthly averagereport only (lb/d)all year
Chlorine usagedaily maximumreport only (lb/d)all year

Cited limits by parameter: Oregon'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/OR0020460 · MCP: https://passage-data.com/mcp