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Water & Wastewater Services

Sewage treatment plant, Mount Vernon, Washington. NPDES permit WA0030597 expired Feb 28, 2026; its terms still apply. 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 (20 values), outfall IN1 form MM monthly (8 values), outfall 001 form AA yearly
Last report on file
February 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 25 reports late

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeaveragereport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year001
Oxygen, dissolved [DO]averagereport 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. Caverage≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Caverage≤ 88 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 131 lb/dall year001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedaverage≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedaverage≤ 88 lb/dall year001
Solids, total suspendedweekly average≤ 131 lb/dall year001
Oil and grease, hexane extr methodaveragereport only (mg/L) (alert, not enforceable)all year001
Oil and grease, hexane extr methodmaximumreport only (mg/L) (alert, not enforceable)all year001
Phosphorus, total [as P]averagereport only (mg/L) (alert, not enforceable)all year001
Phosphorus, total [as P]maximumreport only (mg/L) (alert, not enforceable)all year001
Hardness, total [as CaCO3]averagereport only (mg/L) (alert, not enforceable)all year001
Hardness, total [as CaCO3]maximumreport only (mg/L) (alert, not enforceable)all year001
Phosphorus [reactive as P]averagereport only (mg/L) (alert, not enforceable)all year001
Phosphorus [reactive as P]maximumreport only (mg/L) (alert, not enforceable)all year001
Ultraviolet light intensityaveragereport only (mW/cm2) (alert, not enforceable)all year001
Chlorine, total residualaverage≤ .5 mg/Lall year001
BOD, percent removal [total]monthly average minimum≥ 85 %all year001
E. coliaveragereport only (#/100mL) (alert, not enforceable)all year001
E. colimaximumreport only (#/100mL) (alert, not enforceable)all year001
Solids, total dissolvedaveragereport only (mg/L) (alert, not enforceable)all year001
Solids, total dissolvedmaximumreport only (mg/L) (alert, not enforceable)all year001
Coliform, fecal generalmonthly geometric mean≤ 100 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 200 #/100mLall year001
Flowaveragereport only (MGD) (alert, not enforceable)all year001
Flowmaximumreport only (MGD) (alert, not enforceable)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. 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. Cmaximumreport only (lb/d) (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 suspendedaveragereport 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0030597 · MCP: https://passage-data.com/mcp