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City of Grand Coulee

Sewage treatment plant, Grand Coulee, Washington. NPDES permit WA0044857 expired Dec 31, 2014; its limits 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 (18 values), outfall IN1 form MM monthly (10 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 24 reports late

Limits in force (31)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradedaily maximumreport only (deg C) (alert, not enforceable)all year001
Oxygen, dissolved [DO]maximumreport 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. Cmonthly average≤ 75 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 112 lb/dall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 75 lb/dall year001
Solids, total suspendedweekly average≤ 112 lb/dall year001
Nitrite + Nitrate total [as N]maximumreport only (mg/L)all year001
Nitrogen, inorganic totalmaximumreport only (mg/L)all year001
Phosphorus, total [as P]maximumreport only (mg/L)all year001
Chlorine, total residualaveragereport only (mg/L)all year001
Chlorine, total residualmaximumreport only (mg/L)all year001
BOD, percent removal [total]monthly average minimum≥ 85 %all year001
Coliform, fecal generalmonthly average≤ 100 #/100mLall year001
Coliform, fecal generalweekly average≤ 200 #/100mLall year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
BOD, 5-day, 20 deg. Caveragereport only (mg/L)all yearIN1
BOD, 5-day, 20 deg. Cmaximumreport only (mg/L)all yearIN1
BOD, 5-day, 20 deg. Cdaily maximumreport only (lb/d)all yearIN1
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all yearIN1
Solids, total suspendedaveragereport only (mg/L)all yearIN1
Solids, total suspendedmaximumreport only (mg/L)all yearIN1
Solids, total suspendeddaily maximumreport only (lb/d)all yearIN1
Solids, total suspendedmonthly averagereport only (lb/d)all yearIN1
Flowaveragereport only (MGD)all yearIN1
Flowmaximumreport only (MGD)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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0044857 · MCP: https://passage-data.com/mcp