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City of Omak

Sewage treatment plant, Omak, Washington. NPDES permit WA0020940 expired Dec 31, 2020; its limits still apply. Last 12 months: no values over a limit, 88 required values missing, 11 of 28 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (23 values), outfall 001 form QQ quarterly (1 value), outfall IN1 form MM monthly (7 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 96 required values missing, 12 of 28 reports late

Limits in force (72)

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
Temperature, water deg. centigrademinimumreport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademinimumreport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year001
Temperature, water deg. centigrademonthly averagereport only (deg C) (alert, not enforceable)all year001
Oxygen, dissolved [DO]maximumreport only (mg/L) (alert, not enforceable)all year001
Oxygen, dissolved [DO]maximumreport only (mg/L) (alert, not enforceable)all year001
Oxygen, dissolved [DO]minimumreport only (mg/L) (alert, not enforceable)all year001
Oxygen, dissolved [DO]minimumreport only (mg/L) (alert, not enforceable)all year001
Oxygen, dissolved [DO]monthly averagereport only (mg/L) (alert, not enforceable)all year001
Oxygen, dissolved [DO]monthly averagereport only (mg/L) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L)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. Cmaximumreport only (lb/d)all year001
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Cmaximumreport only (lb/d) (alert, not enforceable)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 330 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 330 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 330 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 495 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 495 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 495 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 495 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 suspendedmaximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmaximumreport only (lb/d)all year001
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all year001
Solids, total suspendedmaximumreport only (lb/d) (alert, not enforceable)all year001
Solids, total suspendedmonthly average≤ 247.5 lb/dall year001
Solids, total suspendedmonthly average≤ 247.5 lb/dall year001
Solids, total suspendedmonthly average≤ 247.5 lb/dall year001
Solids, total suspendedweekly average≤ 371.3 lb/dall year001
Solids, total suspendedweekly average≤ 371.3 lb/dall year001
Solids, total suspendedweekly average≤ 371.3 lb/dall year001
Solids, total suspendedweekly average≤ 371.3 lb/dall year001
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)all year001
Nitrogen, ammonia total [as N]maximumreport only (mg/L) (alert, not enforceable)all 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≤ 100 #/100mLall year001
Coliform, fecal generalmonthly geometric mean≤ 100 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 200 #/100mLall year001
Coliform, fecal generalweekly geometric mean≤ 200 #/100mLall year001
Flowmaximumreport only (MGD) (alert, not enforceable)all year001
Flowmaximumreport only (MGD) (alert, not enforceable)all year001
Flowmonthly averagereport only (MGD) (alert, not enforceable)all year001
Flowmonthly averagereport only (MGD) (alert, not enforceable)all year001
Flowmonthly totalreport only (MGD) (alert, not enforceable)all year001
Flowmonthly totalreport only (MGD) (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. 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. Cmonthly averagereport only (mg/L) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmonthly averagereport 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 suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmaximumreport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmonthly averagereport only (mg/L) (alert, not enforceable)all yearIN1
Solids, total suspendedmonthly averagereport only (mg/L) (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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0020940 · MCP: https://passage-data.com/mcp