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

City of West Richland

Sewage treatment plant, West Richland, Washington. NPDES permit WA0051063 expired Oct 31, 2026. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form MM monthly (26 values), form QQ quarterly (6 values), form AA yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 12 required values missing, 0 of 17 reports late

Limits in force (42)

ParameterStatisticLimitMonths
Temperature, water deg. centigradeaveragereport only (deg C) (alert, not enforceable)all year
Temperature, water deg. centigrademaximumreport only (deg C) (alert, not enforceable)all year
Oxygen, dissolved [DO]minimum≥ 2.9 mg/Lall year
Oxygen, dissolved [DO]averagereport only (mg/L) (alert, not enforceable)all year
BOD, 5-day, 20 deg. Caverage≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Caverage≤ 125 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 125 lb/dall year
pHmaximum≤ 8.5 SUall year
pHminimum≥ 6.5 SUall year
Solids, total suspendedaverage≤ 15 mg/Lall year
Solids, total suspendedweekly average≤ 15 mg/Lall year
Solids, total suspendedaverage≤ 187.7 lb/dall year
Solids, total suspendedweekly average≤ 187.7 lb/dall year
Oil and grease, hexane extr methodmaximumreport only (mg/L) (alert, not enforceable)all year
Nitrogen, ammonia total [as N]maximum≤ 1 mg/Lall year
Nitrogen, ammonia total [as N]single readingreport only (mg/L) (alert, not enforceable)all year
Nitrogen, ammonia total [as N]maximum≤ 12.5 lb/dall year
Nitrogen, Kjeldahl, total [as N]single readingreport only (mg/L) (alert, not enforceable)all year
Nitrogen, Kjeldahl, total [as N]maximumreport only (mg/L) (alert, not enforceable)all year
Nitrite + Nitrate total [as N]single readingreport only (mg/L) (alert, not enforceable)all year
Nitrite + Nitrate total [as N]maximumreport only (mg/L) (alert, not enforceable)all year
Phosphorus, total [as P]maximumreport only (mg/L) (alert, not enforceable)all year
Phosphorus, total [as P]single readingreport only (mg/L) (alert, not enforceable)all year
Phosphorus, dissolved reactive [drp as P]maximumreport only (mg/L) (alert, not enforceable)all year
Cyanide, total [as CN]single readingreport only (ug/L) (alert, not enforceable)all year
Hardness, total [as CaCO3]maximumreport only (mg/L) (alert, not enforceable)all year
Total phenolssingle readingreport only (ug/L)all year
Phenolics, totalsingle readingreport only (ug/L) (alert, not enforceable)all year
BOD, percent removal [total]minimum≥ 85 %all year
E. colisingle readingreport only (#/100mL) (alert, not enforceable)all year
Ultraviolet light transmittanceaveragereport only (%) (alert, not enforceable)all year
Ultraviolet light transmittancemaximumreport only (%) (alert, not enforceable)all year
Number of operating tubesaveragereport only (#) (alert, not enforceable)all year
Number of operating tubesmaximumreport only (#) (alert, not enforceable)all year
Solids, total dissolvedmaximumreport only (mg/L) (alert, not enforceable)all year
Coliform, fecal generalsingle readingreport only (MPN/100mL) (alert, not enforceable)all year
Coliform, fecal generalmonthly geometric mean≤ 100 #/100mLall year
Coliform, fecal generalweekly geometric mean≤ 200 #/100mLall year
Flowaveragereport only (MGD) (alert, not enforceable)all year
Flowmaximumreport only (MGD) (alert, not enforceable)all year
Solids, suspended percent removalminimum≥ 85 %all year

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/WA0051063 · MCP: https://passage-data.com/mcp