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Pierce, City of

Sewage treatment plant, Pierce, Idaho. NPDES permit ID0020206 expired May 31, 2023; its limits still apply. Last 12 months: over a limit once (last March 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), outfall REC form R quarterly (1 value), outfall 001 form Y yearly
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 21 reports late

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

Period endingParameterReportedLimitOver by
March 2026Solids, suspended percent removal, monthly average minimum84.79 %≥ 85 %1%

Limits in force (42)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigradeweekly averagereport only (deg C)all year001
Temperature, water deg. centigradedaily maximumreport only (deg C)all year001
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year001
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≤ 75 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 113 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≤ 75 lb/dall year001
Solids, total suspendedweekly average≤ 113 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly average≤ 17.8 mg/Lall year001
Nitrogen, ammonia total [as N]daily maximum≤ 46 mg/Lall year001
Nitrogen, ammonia total [as N]monthly average≤ 44.5 lb/dall year001
Nitrogen, ammonia total [as N]daily maximum≤ 115 lb/dall year001
Nitrogen, Kjeldahl, total [as N]annual maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]annual maximumreport only (mg/L)all year001
Phosphorus, total [as P]annual maximumreport only (ug/L)all year001
Oil and greaseannual maximumreport only (mg/L)all year001
E. coli, MTEC-MFgeometric mean≤ 126 #/100mLall year001
E. coli, MTEC-MFinstantaneous maximum≤ 406 #/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 residualannual maximumreport only (ug/L)all year001
Chlorine, total residualmonthly average≤ 50 ug/Lall year001
Chlorine, total residualdaily maximum≤ 80 ug/Lall year001
Chlorine, total residualmonthly average≤ .13 lb/dall year001
Chlorine, total residualdaily maximum≤ .2 lb/dall year001
Solids, total dissolvedannual maximumreport only (mg/L)all 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
pHinstantaneous minimumreport only (SU)all yearREC
pHinstantaneous maximumreport only (SU)all yearREC
Nitrogen, total [as N]instantaneous maximumreport only (mg/L)all yearREC
Nitrogen, ammonia total [as N]instantaneous maximumreport only (mg/L)all yearREC
Phosphorus, total [as P]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/ID0020206 · MCP: https://passage-data.com/mcp