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City of Ilwaco

Sewage treatment plant, Ilwaco, Washington. NPDES permit WA0023159, in force until Aug 31, 2030. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (24 values), outfall INF form MM monthly (10 values), outfall RNF form MM monthly (1 value), outfall 001 form AA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 24 required values missing, 0 of 40 reports late

Limits in force (43)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)Jun–Sep001
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)Jun–Sep001
Oxygen, dissolved [DO]single readingreport only (mg/L) (alert, not enforceable)all year001
Oxygen, dissolved [DO]minimumreport 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≤ 240 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 360 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 240 lb/dall year001
Solids, total suspendedweekly average≤ 360 lb/dall year001
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)all year001
Nitrogen, ammonia total [as N]monthly averagereport 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
Hardness, total [as CaCO3]single readingreport only (mg/L) (alert, not enforceable)all year001
BOD, percent removal [total]monthly average minimum≥ 85 %all year001
Oil & grease, non-polar materialsingle readingreport only (mg/L) (alert, not enforceable)all year001
Enterococcisingle readingreport only (#/100mL) (alert, not enforceable)all year001
Net rate of additionof heatmonthly average≤ 8770 kcal/dJun–Sep001
Solids, total dissolvedsingle readingreport only (mg/L) (alert, not enforceable)all year001
Coliform, fecal generalmonthly geometric mean≤ 110 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 370 #/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
Flowmaximumreport only (MGD) (alert, not enforceable)all yearINF
Flowmonthly averagereport only (MGD) (alert, not enforceable)all yearINF
Precipitation volumemonthly averagereport only (in/d) (alert, not enforceable)all yearRNF

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/WA0023159 · MCP: https://passage-data.com/mcp