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Middleton, City of

Sewage treatment plant, Middleton, Idaho. NPDES permit ID0021831 expired Nov 2, 2004; its limits still apply. Last 12 months: no values over a limit, 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form A monthly (22 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (26)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademinimumreport only (deg C)all year
Temperature, water deg. centigrademaximumreport only (deg C)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 687 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 992 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 70 mg/Lall year
Solids, total suspendedweekly average≤ 105 mg/Lall year
Solids, total suspendedmonthly average≤ 1070 lb/dall year
Solids, total suspendedweekly average≤ 1605 lb/dall year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 100 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal MF, MFC broth, 44.5 Cmonthly geometric mean≤ 50 #/100mLMay–Sep
Coliform, fecal MF, MFC broth, 44.5 Cweekly geometric mean≤ 200 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal MF, MFC broth, 44.5 Cweekly geometric mean≤ 100 #/100mLMay–Sep
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 800 #/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
Coliform, fecal MF, MFC broth, 44.5 Cdaily maximum≤ 500 #/100mLMay–Sep
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .5 mg/Lall year
Chlorine, total residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
BOD, 5-day, percent removalminimum % removal≥ 65 %all year

How strict are these limits?

Cited limits by parameter: Idaho'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/ID0021831 · MCP: https://passage-data.com/mcp