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City of Palouse

Sewage treatment plant, Palouse, Washington. NPDES permit WA0044806 expired Mar 31, 2020; its limits still apply. Last 12 months: over a limit 2 times (last June 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form MM monthly (21 values), outfall 002 form MM monthly (2 values), outfall IN1 form MM monthly (12 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
10 values over a limit, 1 required value missing, 0 of 36 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, monthly average21.6≤ 15 mg/L44%
June 2026Coliform, fecal general, weekly geometric mean920≤ 200 #/100mL360%

Limits in force (70)

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
Oxygen, dissolved [DO]minimumreport 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. Cmonthly average≤ 10 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 23.4 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 23.4 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 35 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 35 lb/dall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily minimum≥ 6.5 SUall year001
pHdaily maximum≤ 8.5 SUall year001
pHdaily maximum≤ 8.5 SUall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedmonthly average≤ 15 mg/Lall year001
Solids, total suspendedweekly average≤ 22.5 mg/Lall year001
Solids, total suspendedweekly average≤ 22.5 mg/Lall year001
Solids, total suspendedmonthly average≤ 35 lb/dall year001
Solids, total suspendedmonthly average≤ 35 lb/dall year001
Solids, total suspendedweekly average≤ 52.5 lb/dall year001
Solids, total suspendedweekly average≤ 52.5 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/Lall year001
Nitrogen, Kjeldahl, total [as N]maximumreport only (mg/L) (alert, not enforceable)all year001
Nitrogen, Kjeldahl, total [as N]maximumreport only (mg/L) (alert, not enforceable)all year001
Nitrite + Nitrate total [as N]maximumreport only (mg/L) (alert, not enforceable)all year001
Nitrite + Nitrate 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 (gal/d) (alert, not enforceable)all year001
Flowmaximumreport only (gal/d) (alert, not enforceable)all year001
Flowmonthly averagereport only (gal/d) (alert, not enforceable)all year001
Flowmonthly averagereport only (gal/d) (alert, not enforceable)all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Flowmaximumreport only (cfs) (alert, not enforceable)all year002
Flowmaximumreport only (cfs) (alert, not enforceable)all year002
Flowmonthly averagereport only (cfs) (alert, not enforceable)all year002
Flowmonthly averagereport only (cfs) (alert, not enforceable)all year002
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. Cmaximumreport 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. Cmonthly averagereport only (lb/d) (alert, not enforceable)all yearIN1
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d) (alert, not enforceable)all yearIN1
pHmaximumreport only (SU) (alert, not enforceable)all yearIN1
pHmaximumreport only (SU) (alert, not enforceable)all yearIN1
pHminimumreport only (SU) (alert, not enforceable)all yearIN1
pHminimumreport only (SU) (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
Solids, total suspendedmonthly averagereport only (lb/d) (alert, not enforceable)all yearIN1
Solids, total suspendedmonthly averagereport only (lb/d) (alert, not enforceable)all yearIN1
Flowmaximumreport only (gal/d) (alert, not enforceable)all yearIN1
Flowmaximumreport only (gal/d) (alert, not enforceable)all yearIN1
Flowmonthly averagereport only (gal/d) (alert, not enforceable)all yearIN1
Flowmonthly averagereport only (gal/d) (alert, not enforceable)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/WA0044806 · MCP: https://passage-data.com/mcp