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Smelterville, City of

Sewage treatment plant, Smelterville, Idaho. NPDES permit ID0020117 expired Sep 30, 2018; its limits still apply. Last 12 months: over a limit 5 times (last July 2026), 18 of 33 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: outfall 001 form A monthly (54 values), outfall REC form A monthly (1 value), outfall REC form S1 monthly (6 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
16 values over a limit, 0 required values missing, 27 of 36 reports late

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

Period endingParameterReportedLimitOver by
November 2025Lead, total recoverable, monthly average.0194 lb/d≤ .013 lb/d49%
July 2026Lead, total recoverable, monthly average.0186 lb/d≤ .013 lb/d43%
July 2026Solids, suspended percent removal, monthly average minimum64.6 %≥ 65 %1%
July 2026Solids, total suspended, monthly average47.5 mg/L≤ 45 mg/L6%
July 2026Solids, total suspended, weekly average68 mg/L≤ 65 mg/L5%

Limits in force (65)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly 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
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year001
BOD, 5-day, 20 deg. Cmonthly average≤ 45 mg/Lall year001
BOD, 5-day, 20 deg. Cweekly average≤ 65 mg/Lall year001
BOD, 5-day, 20 deg. Cmonthly average≤ 94 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 136 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
Alkalinity, total [as CaCO3]monthly averagereport only (mg/L)all year001
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)all year001
Solids, total suspendedmonthly average≤ 45 mg/Lall year001
Solids, total suspendedweekly average≤ 65 mg/Lall year001
Solids, total suspendedmonthly average≤ 94 lb/dall year001
Solids, total suspendedweekly average≤ 136 lb/dall year001
Solids, total suspendedmonthly averagereport only (mg/L)all year001
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Jan–Jun001
Nitrogen, ammonia total [as N]monthly average≤ 26.8 mg/LJul–Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Jan–Jun001
Nitrogen, ammonia total [as N]daily maximum≤ 70.1 mg/LJul–Dec001
Nitrogen, ammonia total [as N]monthly averagereport only (lb/d)Jan–Jun001
Nitrogen, ammonia total [as N]monthly average≤ 56 lb/dJul–Dec001
Nitrogen, ammonia total [as N]daily maximumreport only (lb/d)Jan–Jun001
Nitrogen, ammonia total [as N]daily maximum≤ 146 lb/dJul–Dec001
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)all year001
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)all year001
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)all year001
Nitrite + Nitrate 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]daily maximumreport only (mg/L)all year001
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year001
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year001
Zinc, total recoverablemonthly average≤ 1290 ug/Lall year001
Zinc, total recoverabledaily maximum≤ 2220 ug/Lall year001
Zinc, total recoverablemonthly average≤ 2.7 lb/dall year001
Zinc, total recoverabledaily maximum≤ 4.6 lb/dall year001
Cadmium, total recoverablemonthly average≤ 13.5 ug/Lall year001
Cadmium, total recoverabledaily maximum≤ 21.9 ug/Lall year001
Cadmium, total recoverablemonthly average≤ .028 lb/dall year001
Cadmium, total recoverabledaily maximum≤ .046 lb/dall year001
Lead, total recoverablemonthly average≤ 42 ug/Lall year001
Lead, total recoverabledaily maximum≤ 64 ug/Lall year001
Lead, total recoverablemonthly average≤ .013 lb/dall year001
Lead, total recoverabledaily maximum≤ .088 lb/dall year001
Oil and greasemonthly averagereport only (mg/L)all year001
Oil and greasedaily maximumreport only (mg/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLall year001
E. coli, MTEC-MFinstantaneous maximum≤ 576 #/100mLall 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≤ 73 ug/Lall year001
Chlorine, total residualmonthly averagereport only (lb/d)all year001
Chlorine, total residualdaily maximum≤ .15 lb/dall year001
BOD, 5-day, percent removalmonthly average minimum≥ 65 %all year001
Solids, suspended percent removalmonthly average minimum≥ 65 %all year001
Temperature, water deg. centigradesemi-annual maximumreport only (deg C)all yearREC
Stream flow, instantaneousdaily averagereport only (cfs)all yearREC
pHinstantaneous minimumreport only (SU)all yearREC
pHinstantaneous maximumreport only (SU)all yearREC
Nitrogen, ammonia total [as N]semi-annual maximumreport only (mg/L)all yearREC
Phosphorus, total [as P]semi-annual maximumreport only (mg/L)all yearREC
Hardness, total [as CaCO3]semi-annual 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/ID0020117 · MCP: https://passage-data.com/mcp