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Cowlitz County Public Works--Ryderwood

Sewage treatment plant, Ryderwood, Washington. NPDES permit WA0038695, in force until Sep 30, 2029. Last 12 months: over a limit 2 times (last December 2025), 7 required values missing, 1 of 41 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 002 form MM monthly (15 values), outfall CLCC form MM monthly (4 values), outfall CLCC form QQ quarterly (1 value), outfall INF form MM monthly (10 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 3 required values missing, 2 of 39 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
December 2025BOD, 5-day, 20 deg. C, weekly average39≤ 34 lb/d15%
December 2025Solids, total suspended, weekly average86.56≤ 49 lb/d77%

Limits in force (30)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year002
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year002
Oxygen, dissolved [DO]monthly averagereport only (mg/L) (alert, not enforceable)all year002
Oxygen, dissolved [DO]weekly averagereport only (mg/L) (alert, not enforceable)all year002
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year002
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year002
BOD, 5-day, 20 deg. Cmonthly average≤ 23 lb/dall year002
BOD, 5-day, 20 deg. Cweekly average≤ 34 lb/dall year002
pHmaximum≤ 9 SUall year002
pHminimum≥ 6 SUall year002
Solids, total suspendedmonthly average≤ 45 mg/Lall year002
Solids, total suspendedweekly average≤ 65 mg/Lall year002
Solids, total suspendedmonthly average≤ 34 lb/dall year002
Solids, total suspendedweekly average≤ 49 lb/dall year002
Chlorine, total residualmonthly average≤ 5 mg/Lall year002
E. colisingle readingreport only (#/100mL) (alert, not enforceable)all yearCLCC
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall yearCLCC
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall yearCLCC
Flowmonthly averagereport only (MGD) (alert, not enforceable)all yearCLCC
Flowweekly averagereport only (MGD) (alert, not enforceable)all yearCLCC
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
Flowmaximumreport only (MGD) (alert, not enforceable)all yearINF
Flowmonthly averagereport only (MGD) (alert, not enforceable)all yearINF

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/WA0038695 · MCP: https://passage-data.com/mcp