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Interior, Reclamation

Federal facility (Sewerage Systems), Coulee Dam, Washington. NPDES permit WA0024163 expired Jul 31, 2019; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (27 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 12 reports late

Limits in force (27)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 4.5 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 6.8 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 4.5 lb/dall year
Solids, total suspendedweekly average≤ 6.8 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]quarterly maximumreport only (mg/L)all year
Fecal coliform, MPN, EC med, 44.5 Cmonthly geometric mean≤ 50 CFU/100mLall year
Fecal coliform, MPN, EC med, 44.5 Cinstantaneous maximum≤ 100 CFU/100mLall year
Floating solids, waste or visible foam-visualmonthly maximum≤ 0 N=0;Y=1all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .5 mg/Lall year
Chlorine, total residualweekly average≤ .75 mg/Lall year
Chlorine, total residualmonthly average≤ .08 lb/dall year
Chlorine, total residualweekly average≤ .11 lb/dall year
Enterococcimonthly geometric mean≤ 8 CFU/100mLall year
Enterococciinstantaneous maximum≤ 35 CFU/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Oil and grease visualmonthly maximum≤ 0 N=0;Y=1all year

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/WA0024163 · MCP: https://passage-data.com/mcp