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Alcoa Wenatchee LLC

Industrial or other facility, major discharger, Malaga, Washington. NPDES permit WA0000680 expired Oct 31, 2026. Last 12 months: over a limit once (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001C form MM monthly (18 values), outfall 001N form MM monthly (2 values), outfall 00SC form 01 monthly (19 values), outfall 00SI form MM monthly (2 values), outfall INTK form MM monthly (2 values), outfall PROD form MM monthly (1 value), and 2 more forms
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 85 reports late

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

Period endingParameterReportedLimitOver by
September 2026Solids, total suspended, weekly average51≤ 45 mg/L13%

Limits in force (47)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C) (alert, not enforceable)all year001C
Solids, total suspendeddaily maximumreport only (mg/L) (alert, not enforceable)all year001C
Solids, total suspendeddaily maximumreport only (lb/d) (alert, not enforceable)all year001C
Solids, total suspendedmonthly averagereport only (lb/d) (alert, not enforceable)all year001C
Oil and grease, hexane extr methoddaily maximumreport only (mg/L) (alert, not enforceable)all year001C
Oil and grease, hexane extr methodmonthly average≤ 50 lb/dall year001C
Cyanide, free [amenable to chlorination]single readingreport only (mg/L) (alert, not enforceable)all year001C
Fluoride, total [as F]daily maximumreport only (mg/L) (alert, not enforceable)all year001C
Fluoride, total [as F]daily maximum≤ 150 lb/dall year001C
Fluoride, total [as F]monthly average≤ 25 lb/dall year001C
Aluminum, total [as Al]daily maximumreport only (mg/L) (alert, not enforceable)all year001C
Aluminum, total [as Al]daily maximumreport only (lb/d) (alert, not enforceable)all year001C
Aluminum, total [as Al]monthly averagereport only (lb/d) (alert, not enforceable)all year001C
Benzo[a]pyrenesingle readingreport only (ug/L) (alert, not enforceable)all year001C
Net rate of additionof heatmonthly average≤ 531 mkcal/dayJul–Oct001C
pH, maximumdaily maximum≤ 9 SU (alert, not enforceable)all year001C
pH, minimumdaily minimum≥ 6 SU (alert, not enforceable)all year001C
Flowdaily maximumreport only (MGD) (alert, not enforceable)all year001C
Flowmonthly averagereport only (MGD) (alert, not enforceable)all year001C
Daily excursion time [min]monthly total≤ 446 minall year001C
Solids, total suspendedmonthly average≤ 100 lb/dall year001N
Aluminum, total [as Al]monthly average≤ 15 lb/dall year001N
BOD, 5-day, 20 deg. Cmonthly average≤ 25 mg/Lall year00SC
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year00SC
BOD, 5-day, 20 deg. Cmonthly average≤ 19 lb/dall year00SC
BOD, 5-day, 20 deg. Cweekly average≤ 34 lb/dall year00SC
Solids, total suspendedmonthly average≤ 30 mg/Lall year00SC
Solids, total suspendedweekly average≤ 45 mg/Lall year00SC
Solids, total suspendedmonthly average≤ 25 lb/dall year00SC
Solids, total suspendedweekly average≤ 34 lb/dall year00SC
Chlorine, total residualdaily minimum≥ .1 mg/Lall year00SC
Chlorine, total residualdaily maximum≤ 2 mg/Lall year00SC
BOD, percent removal [total]monthly average minimum≥ 65 % (alert, not enforceable)all year00SC
Number of operating tubesdaily minimum≥ 9 #all year00SC
pH, maximumdaily maximum≤ 9 SU (alert, not enforceable)all year00SC
pH, minimumdaily minimum≥ 6 SU (alert, not enforceable)all year00SC
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year00SC
Coliform, fecal generalweekly geometric mean≤ 400 #/100mLall year00SC
Flowmonthly averagereport only (MGD) (alert, not enforceable)all year00SC
Solids, suspended percent removalmonthly average minimum≥ 65 % (alert, not enforceable)all year00SC
Daily excursion time [min]monthly total≤ 446 minall year00SC
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L) (alert, not enforceable)all year00SI
Solids, total suspendedmonthly averagereport only (mg/L) (alert, not enforceable)all year00SI
Solids, total suspendeddaily maximumreport only (mg/L) (alert, not enforceable)all yearINTK
Aluminum, total [as Al]daily maximumreport only (mg/L) (alert, not enforceable)all yearINTK
Total production - massmonthly averagereport only (ton/d) (alert, not enforceable)all yearPROD
Rainfallmonthly totalreport only (in) (alert, not enforceable)all yearRAIN

How strict are these limits?

Cited limits by parameter: Washington's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0000680 · MCP: https://passage-data.com/mcp