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Blackfoot, City of

Sewage treatment plant, major discharger, Blackfoot, Idaho. NPDES permit ID0020044 expired Aug 31, 2018; its limits still apply. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 10 days after each period: form A monthly (37 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
2 values over a limit, 0 required values missing, 1 of 12 reports late

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

Period endingParameterReportedLimitOver by
December 2025Phosphorus, total [as P], annual average42.2 lb/d≤ 38.9 lb/d8%

Limits in force (43)

ParameterStatisticLimitMonths
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≤ 801 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 1200 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 650 lb/dall year
Solids, total suspendedweekly average≤ 1525 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedannual average≤ 397 lb/dDec
Nitrogen, ammonia total [as N]monthly average≤ 13.8 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 8.25 mg/LApr–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 38.7 mg/LJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 23.1 mg/LApr–Sep
Nitrogen, ammonia total [as N]monthly average≤ 587 lb/dJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 350 lb/dApr–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 1650 lb/dJan, Feb, Mar, Oct, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 983 lb/dApr–Sep
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]maximum weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly average≤ 141 lb/dall year
Phosphorus, total [as P]weekly average≤ 212 lb/dall year
Phosphorus, total [as P]annual average≤ 38.9 lb/dDec
Arsenic, total recoverableinstantaneous maximumreport only (ug/L)all year
Nickel, total recoverableinstantaneous maximumreport only (ug/L)all year
Silver total recoverableinstantaneous maximumreport only (ug/L)all year
Zinc, total recoverableinstantaneous maximumreport only (ug/L)all year
Cadmium, total recoverableinstantaneous maximumreport only (ug/L)all year
Chromium, total recoverableinstantaneous maximumreport only (ug/L)all year
Copper, total recoverableinstantaneous maximumreport only (ug/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 averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Mercury, total [as Hg]instantaneous maximumreport only (ug/L)all year
Cyanide, total recoverableinstantaneous maximumreport only (mg/L)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all 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.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/ID0020044 · MCP: https://passage-data.com/mcp