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Aberdeen, City of

Sewage treatment plant, Aberdeen, Idaho. NPDES permit ID0020176 expired Feb 28, 2021; its limits still apply. Last 12 months: over a limit 5 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form A monthly (29 values), outfall REC form Q quarterly (5 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
8 values over a limit, 0 required values missing, 0 of 16 reports late

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

Period endingParameterReportedLimitOver by
June 2026E. coli, MTEC-MF, instantaneous maximum1732.9 CFU/100mL≤ 406 CFU/100mL327%
August 2026BOD, 5-day, 20 deg. C, monthly average30.8 mg/L≤ 30 mg/L3%
September 2026BOD, 5-day, 20 deg. C, weekly average64 mg/L≤ 45 mg/L42%
September 2026E. coli, MTEC-MF, instantaneous maximum2419.2 CFU/100mL≤ 406 CFU/100mL496%
September 2026pH, instantaneous maximum9.09 SU≤ 9 SU—

Limits in force (34)

ParameterStatisticLimitMonthsOutfall
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 205 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 308 lb/dall year001
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year001
pHinstantaneous minimum≥ 6.5 SUall year001
pHinstantaneous maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedweekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 205 lb/dall year001
Solids, total suspendedweekly average≤ 308 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year001
Phosphorus, total [as P]monthly averagereport only (mg/L)all year001
Phosphorus, total [as P]weekly averagereport only (mg/L)all year001
Phosphorus, total [as P]monthly average≤ 38 lb/dall year001
Phosphorus, total [as P]weekly average≤ 57 lb/dall year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLall year001
E. coli, MTEC-MFinstantaneous maximum≤ 406 CFU/100mLall year001
Floating solids, waste or visible foam-visualmonthly maximum≤ 0 N=0;Y=1all year001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year001
Chlorine, total residualmonthly average≤ 50 ug/Lall year001
Chlorine, total residualdaily maximum≤ 50 ug/Lall year001
Chlorine, total residualmonthly average≤ .34 lb/dall year001
Chlorine, total residualdaily maximum≤ .34 lb/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all yearREC
Stream flow, instantaneousinstantaneous minimumreport only (MGD)all yearREC
pHinstantaneous minimumreport only (SU)all yearREC
pHinstantaneous maximumreport only (SU)all yearREC
Nitrogen, ammonia total [as N]instantaneous maximumreport only (mg/L)all yearREC

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/ID0020176 · MCP: https://passage-data.com/mcp