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City of Montesano

Sewage treatment plant, Montesano, Washington. NPDES permit WA0024660, in force until Nov 30, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (20 values), outfall 001 form QQ quarterly (5 values), outfall INF form MM monthly (10 values), outfall 001 form AA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 27 reports late

Limits in force (40)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year001
Oxygen, dissolved [DO]single readingreport only (mg/L) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 159 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 239 lb/dall year001
pHmaximum≤ 9 SUall year001
pHminimum≥ 6 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 33 lb/dall year001
Solids, total suspendedweekly average≤ 50 lb/dall year001
Nitrogen, ammonia total [as N]single readingreport only (mg/L) (alert, not enforceable)all year001
Nitrogen, Kjeldahl, total [as N]single readingreport only (mg/L) (alert, not enforceable)all year001
Nitrite + Nitrate total [as N]single readingreport only (mg/L) (alert, not enforceable)all year001
Phosphorus, total [as P]single readingreport only (mg/L) (alert, not enforceable)all year001
Phosphorus, dissolved reactive [drp as P]single readingreport only (mg/L) (alert, not enforceable)all year001
Hardness, total [as CaCO3]single readingreport only (mg/L) (alert, not enforceable)all year001
Chlorine, total residualmonthly average≤ .5 ug/Lall year001
Chlorine, total residualweekly average≤ .75 ug/Lall year001
BOD, percent removal [total]monthly average minimum≥ 85 %all year001
E. colisingle readingreport only (#/100mL) (alert, not enforceable)all year001
Oil & grease, non-polar materialsingle readingreport only (mg/L) (alert, not enforceable)all year001
Solids, total dissolvedsingle readingreport only (mg/L) (alert, not enforceable)all year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
Flowmaximumreport only (MGD) (alert, not enforceable)all year001
Flowmonthly averagereport only (MGD) (alert, not enforceable)all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L) (alert, not enforceable)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L) (alert, not enforceable)all yearINF
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all yearINF
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d) (alert, not enforceable)all yearINF
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearINF
Solids, total suspendedmonthly averagereport only (mg/L) (alert, not enforceable)all yearINF
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all yearINF
Solids, total suspendedmonthly averagereport only (lb/d) (alert, not enforceable)all yearINF
Flowmaximum≤ 1.6 MGDall yearINF
Flowmonthly averagereport only (MGD) (alert, not enforceable)all yearINF

How strict are these limits?

Cited limits by parameter: Washington'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/WA0024660 · MCP: https://passage-data.com/mcp