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Riverside Water and Sewer District

Sewage treatment plant, Orofino, Idaho. NPDES permit ID0024503, in force until Dec 31, 2026. Last 12 months: over a limit 2 times (last March 2026), 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (23 values)
Renewal application due
Jul 4, 2026 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
March 2026BOD, 5-day, percent removal, monthly average minimum75.9 %≥ 85 %61%
March 2026Solids, suspended percent removal, monthly average minimum52.2 %≥ 85 %219%

Limits in force (23)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
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≤ 220 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 330 lb/dall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 65 mg/Lall year
Solids, total suspendedmonthly average≤ 330 lb/dall year
Solids, total suspendedweekly average≤ 477 lb/dall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
E. coli, MTEC-MFgeometric mean≤ 126 CFU/100mLall year
E. coli, MTEC-MFinstantaneous maximum≤ 406 CFU/100mLall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .5 mg/Lall year
Chlorine, total residualweekly average≤ .75 mg/Lall year
Chlorine, total residualmonthly average≤ 3.7 lb/dall year
Chlorine, total residualweekly average≤ 5.5 lb/dall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Idaho'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/ID0024503 · MCP: https://passage-data.com/mcp