Passage Data · Check a report · Use it from your AI

Seattle City Light

Sewage treatment plant, Newhalem, Washington. NPDES permit WA0029670 expired Jun 30, 2023; its limits still apply. Last 12 months: over a limit 3 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (18 values), outfall IN1 form MM monthly (8 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 4 of 24 reports late

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

Period endingParameterReportedLimitOver by
June 2026Solids, suspended percent removal, monthly average minimum19≥ 85 %440%
June 2026Solids, total suspended, average61≤ 20 mg/L205%
June 2026Solids, total suspended, weekly average120≤ 30 mg/L300%

Limits in force (52)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Caverage≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Caverage≤ 20 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Caverage≤ 10 lb/dall year001
BOD, 5-day, 20 deg. Caverage≤ 10 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 15 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 15 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedaverage≤ 20 mg/Lall year001
Solids, total suspendedaverage≤ 20 mg/Lall year001
Solids, total suspendedweekly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 30 mg/Lall year001
Solids, total suspendedaverage≤ 10 lb/dall year001
Solids, total suspendedaverage≤ 10 lb/dall year001
Solids, total suspendedweekly average≤ 15 lb/dall year001
Solids, total suspendedweekly average≤ 15 lb/dall year001
Chlorine, total residualdaily maximum≤ .75 mg/Lall year001
Chlorine, total residualdaily maximum≤ .75 mg/Lall year001
BOD, percent removal [total]monthly average minimum≥ 85 %all year001
BOD, percent removal [total]monthly average minimum≥ 85 %all year001
Coliform, fecal generalmonthly geometric mean≤ 50 #/100mLall year001
Coliform, fecal generalmonthly geometric mean≤ 50 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 100 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 100 #/100mLall year001
Flowaveragereport only (gal/d) (alert, not enforceable)all year001
Flowaveragereport only (gal/d) (alert, not enforceable)all year001
Flowmaximumreport only (gal/d) (alert, not enforceable)all year001
Flowmaximumreport only (gal/d) (alert, not enforceable)all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Caveragereport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Caveragereport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Caveragereport only (lb/d) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Caveragereport only (lb/d) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all yearIN1
Solids, total suspendedaveragereport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedaveragereport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedaveragereport only (lb/d) (alert, not enforceable)all yearIN1
Solids, total suspendedaveragereport only (lb/d) (alert, not enforceable)all yearIN1
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all yearIN1
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all yearIN1

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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0029670 · MCP: https://passage-data.com/mcp