Cowlitz County Public Works--Ryderwood

NPDES permit WA0038695 · Minor POTW · effective, expires 2029-09-30 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

2values over a limit
8required values missing, on 5 form(s)
2of 38 forms filed late

Last period with anything received: 2026-07-31. Most often over: BOD, 5-day, 20 deg. C (1), Solids, total suspended (1).

Reporting

Reports are due about 15 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (30)

OutfallParameterStatisticLimitMonths
002Temperature, water deg. centigradeMAXIMUM report only (alert) all year
002Temperature, water deg. centigradeMO AVG report only (alert) all year
002Oxygen, dissolved [DO]MO AVG report only (alert) all year
002Oxygen, dissolved [DO]WKLY AVG report only (alert) all year
002BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
002BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
002BOD, 5-day, 20 deg. CMO AVG <= 23 lb/d all year
002BOD, 5-day, 20 deg. CWKLY AVG <= 34 lb/d all year
002pHMAXIMUM <= 9 SU all year
002pHMINIMUM >= 6 SU all year
002Solids, total suspendedMO AVG <= 45 mg/L all year
002Solids, total suspendedWKLY AVG <= 65 mg/L all year
002Solids, total suspendedMO AVG <= 34 lb/d all year
002Solids, total suspendedWKLY AVG <= 49 lb/d all year
002Chlorine, total residualMO AVG <= 5 mg/L all year
CLCCE. coliSingle Rdg report only (alert) all year
CLCCColiform, fecal generalMO GEOMN <= 200 #/100mL all year
CLCCColiform, fecal generalWK GEOMN <= 400 #/100mL all year
CLCCFlowMO AVG report only (alert) all year
CLCCFlowWKLY AVG report only (alert) all year
INFBOD, 5-day, 20 deg. CMAXIMUM report only (alert) all year
INFBOD, 5-day, 20 deg. CMO AVG report only (alert) all year
INFBOD, 5-day, 20 deg. CMAXIMUM report only (alert) all year
INFBOD, 5-day, 20 deg. CMO AVG report only (alert) all year
INFSolids, total suspendedMAXIMUM report only (alert) all year
INFSolids, total suspendedMO AVG report only (alert) all year
INFSolids, total suspendedMAXIMUM report only (alert) all year
INFSolids, total suspendedMO AVG report only (alert) all year
INFFlowMAXIMUM report only (alert) all year
INFFlowMO AVG report only (alert) all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states