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City of Winlock

Sewage treatment plant, Winlock, Washington. NPDES permit WA0021199, in force until Feb 29, 2028. 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 (23 values), outfall INFL form MM monthly (9 values), outfall 001 form AA yearly
Renewal application due
Sep 2, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 25 reports late

Limits in force (46)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeaveragereport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigradedaily maximumreport 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. Caverage≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Caverage≤ 123 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 185 lb/dall year001
pHdaily minimum≥ 6 SUJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
pHdaily minimum≥ 7.5 SUJun–Sep001
pHdaily maximum≤ 9 SUJan, Feb, Mar, Apr, May, Oct, Nov, Dec001
pHdaily maximum≤ 9 SUJun–Sep001
Bicarbonate ion- [as HCO3]single readingreport only (mg/L) (alert, not enforceable)all year001
Solids, total suspendedaverage≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedaverage≤ 109 lb/dall year001
Solids, total suspendedweekly average≤ 164 lb/dall year001
Oil and grease [soxhlet extr.] tot.single readingreport only (mg/L) (alert, not enforceable)all year001
Nitrogen, ammonia, tot unionized [as N]averagereport only (mg/L) (alert, not enforceable)Jun–Sep001
Nitrogen, ammonia, tot unionized [as N]daily maximumreport only (mg/L) (alert, not enforceable)Jun–Sep001
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
Copper, total [as Cu]average≤ 8.6 ug/LJun–Sep001
Zinc, total recoverableaveragereport only (ug/L) (alert, not enforceable)Jun–Sep001
Zinc, total recoverabledaily maximumreport only (ug/L) (alert, not enforceable)Jun–Sep001
Lead, total recoverableaveragereport only (ug/L) (alert, not enforceable)Jun–Sep001
Lead, total recoverabledaily maximumreport only (ug/L) (alert, not enforceable)Jun–Sep001
E. colisingle readingreport only (#/100mL) (alert, not enforceable)all year001
Solids, total dissolvedsingle readingreport only (mg/L) (alert, not enforceable)all year001
Coliform, fecal generalsingle readingreport only (#/100mL) (alert, not enforceable)all year001
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year001
Flowaveragereport only (MGD) (alert, not enforceable)all year001
Flowdaily maximumreport only (MGD) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Caveragereport only (mg/L) (alert, not enforceable)all yearINFL
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L) (alert, not enforceable)all yearINFL
BOD, 5-day, 20 deg. Caveragereport only (lb/d) (alert, not enforceable)all yearINFL
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all yearINFL
Solids, total suspendedaveragereport only (mg/L) (alert, not enforceable)all yearINFL
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearINFL
Solids, total suspendedaveragereport only (lb/d) (alert, not enforceable)all yearINFL
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all yearINFL
Flowaveragereport only (MGD) (alert, not enforceable)Jan, Feb, Mar, Apr, May, Oct, Nov, DecINFL
Flowaveragereport only (MGD) (alert, not enforceable)Jun–SepINFL

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/WA0021199 · MCP: https://passage-data.com/mcp