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Lewis County Water & Sewer District #6

Sewage treatment plant, Mossyrock, Washington. NPDES permit WA0037141 expired Oct 30, 2016; its limits still apply. Last 12 months: no values over a limit, 36 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (10 values), outfall 001 form QQ quarterly (1 value), outfall INF form MM monthly (8 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 28 reports late

Limits in force (33)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Caverage≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Caverage≤ 20 lb/dall year001
BOD, 5-day, 20 deg. Caverage≤ 20 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 30 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 30 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedaverage≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedaverage≤ 20 lb/dall year001
Solids, total suspendedaverage≤ 20 lb/dall year001
Solids, total suspendedweekly average≤ 30 lb/dall year001
Solids, total suspendedweekly average≤ 30 lb/dall year001
Nitrogen, ammonia total [as N]averagereport only (mg/L)all year001
Rainfallaveragereport only (in)all year001
Rainfalltotalreport only (in)all year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
Flowaveragereport only (MGD)all year001
Flowmaximumreport only (MGD)all year001
BOD, 5-day, 20 deg. Caveragereport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L)all yearINF
BOD, 5-day, 20 deg. Caveragereport only (lb/d)all yearINF
BOD, 5-day, 20 deg. Caveragereport only (lb/d) (alert, not enforceable)all yearINF
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d)all yearINF
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all yearINF
Solids, total suspendedaveragereport only (mg/L)all yearINF
Solids, total suspendedmaximumreport only (mg/L)all yearINF
Solids, total suspendedaveragereport only (lb/d)all yearINF
Solids, total suspendedaveragereport only (lb/d) (alert, not enforceable)all yearINF
Solids, total suspendedmaximumreport only (lb/d)all yearINF
Solids, total suspendedmaximumreport only (lb/d) (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/WA0037141 · MCP: https://passage-data.com/mcp