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Clarkia Water and Sewer District

Sewage treatment plant, Clarkia, Idaho. NPDES permit ID0025071 expired Nov 30, 2016; its limits still apply. Last 12 months: over a limit 3 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form B monthly (21 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 4 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Chlorine, total residual, weekly average.16 lb/d≤ .11 lb/d45%
March 2026Chlorine, total residual, monthly average.09 lb/d≤ .08 lb/d13%
March 2026Chlorine, total residual, weekly average.14 lb/d≤ .11 lb/d27%

Limits in force (21)

ParameterStatisticLimitMonths
Temperature, water deg. centigradedaily maximum≤ 35 deg Call year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 7 lb/dall year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmonthly average≤ 5 lb/dall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedweekly average≤ 7 lb/dall year
Nitrogen, ammonia total [as N]monthly maximumreport only (mg/L)all year
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLall year
E. coli, MTEC-MFinstantaneous maximum≤ 406 #/100mLall year
Floating solids, waste or visible foam-visualmonthly maximum≤ 0 N=0;Y=1all year
Flow, in conduit or thru treatment plantmonthly maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ .5 mg/Lall year
Chlorine, total residualmonthly average≤ .08 lb/dall year
Chlorine, total residualweekly average≤ .75 mg/Lall year
Chlorine, total residualweekly average≤ .11 lb/dall year
Oil and grease visualmonthly maximum≤ 0 N=0;Y=1all 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/ID0025071 · MCP: https://passage-data.com/mcp