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Salmon, City of

Sewage treatment plant, Salmon, Idaho. NPDES permit ID0020001 expired May 31, 2026; its limits still apply. Last 12 months: over a limit 2 times (last August 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: outfall 001 form M monthly (41 values), outfall 001 form T quarterly (2 values), outfall REC1 form M monthly (11 values), outfall REC2 form M monthly (2 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 49 reports late

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

Period endingParameterReportedLimitOver by
August 2026BOD, 5-day, 20 deg. C, monthly average33.8 mg/L≤ 30 mg/L13%
August 2026BOD, 5-day, percent removal, monthly average minimum78 %≥ 85 %47%

Limits in force (56)

ParameterStatisticLimitMonthsOutfall
Temperature, water deg. centigrademonthly averagereport only (deg C)all year001
Temperature, water deg. centigradeinstantaneous maximumreport only (deg C)all year001
Septage discharged to treatment fac.monthly totalreport only (gal)all year001
Oxygen, dissolved [DO]monthly averagereport only (mg/L)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≤ 626 lb/dall year001
BOD, 5-day, 20 deg. Cweekly average≤ 938 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≤ 626 lb/dall year001
Solids, total suspendedweekly average≤ 938 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
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
Arsenic, total recoverablemonthly averagereport only (ug/L)all year001
Arsenic, total recoverabledaily maximumreport only (ug/L)all year001
Zinc, total recoverablemonthly averagereport only (ug/L)all year001
Zinc, total recoverabledaily maximumreport only (ug/L)all year001
Lead, total recoverablemonthly averagereport only (ug/L)all year001
Lead, total recoverabledaily maximumreport only (ug/L)all year001
Copper, total recoverablemonthly averagereport only (ug/L)all year001
Copper, total recoverabledaily maximumreport only (ug/L)all year001
E. coli, MTEC-MFmonthly geometric mean≤ 126 #/100mLall year001
E. coli, MTEC-MFinstantaneous maximumreport only (#/100mL)all year001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all 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
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
Flow, in conduit or thru treatment plantmaximum daily averagereport only (MGD)all year001
Toxicity [chronic], Ceriodaphnia dubiaquarterly maximum≤ 31.5 tox chronic (alert, not enforceable)Mar, Jun, Sep, Dec001
Toxicity [chronic], Pimephales promelas [Fathead Minnow]quarterly maximum≤ 31.5 tox chronic (alert, not enforceable)Mar, Jun, Sep, Dec001
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year001
Solids, suspended percent removalmonthly average minimum≥ 85 %all year001
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC1
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearREC1
pHinstantaneous minimumreport only (SU)Mar, Jun, Sep, DecREC1
pHinstantaneous maximumreport only (SU)Mar, Jun, Sep, DecREC1
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)Mar, Jun, Sep, DecREC1
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, DecREC1
Phosphorus, total [as P]monthly averagereport only (mg/L)Mar, Jun, Sep, DecREC1
Phosphorus, total [as P]daily maximumreport only (mg/L)Mar, Jun, Sep, DecREC1
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, DecREC1
Copper, dissolved [as Cu]monthly averagereport only (ug/L)Mar, Jun, Sep, DecREC1
Copper, dissolved [as Cu]daily maximumreport only (ug/L)Mar, Jun, Sep, DecREC1
Temperature, water deg. centigrademonthly averagereport only (deg C)all yearREC2
Temperature, water deg. centigradedaily maximumreport only (deg C)all yearREC2

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/ID0020001 · MCP: https://passage-data.com/mcp