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City of Ketchum

Sewage treatment plant, major discharger, Ketchum, Idaho. NPDES permit ID0020281 expired Jul 31, 2017; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (54 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 0 of 12 reports late

Limits in force (56)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)Apr–Oct
Temperature, water deg. centigrademonthly averagereport only (deg C)Jan, Feb, Mar, Nov, Dec
Temperature, water deg. centigradedaily maximumreport only (deg C)Apr–Oct
Temperature, water deg. centigradedaily maximumreport only (deg C)Jan, Feb, Mar, Nov, Dec
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year
Oxygen, dissolved [DO]daily maximumreport only (mg/L)all year
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≤ 505 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 760 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6.2 SUall year
pHinstantaneous maximum≤ 9 SUall year
Alkalinity, total [as CaCO3]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Alkalinity, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 275 lb/dall year
Solids, total suspendedannual average≤ 145 lb/dall year
Solids, total suspendedweekly average≤ 542 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, Kjeldahl, total [as N]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Nitrogen, Kjeldahl, total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Nitrite + Nitrate total [as N]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Nitrite + Nitrate total [as N]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]weekly average≤ 1.5 mg/Lall year
Phosphorus, total [as P]monthly average≤ 9.9 lb/dall year
Phosphorus, total [as P]weekly average≤ 14.9 lb/dall year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Hardness, total [as CaCO3]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Zinc, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec
Zinc, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec
Cadmium, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec
Cadmium, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec
Copper, total recoverablemonthly average≤ 19.2 ug/Lall year
Copper, total recoverabledaily maximum≤ 35.1 ug/Lall year
Copper, total recoverablemonthly average≤ .64 lb/dall year
Copper, total recoverabledaily maximum≤ 1.17 lb/dall year
Oil and greasemonthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Oil and greasedaily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Phosphate, ortho [as P]monthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Phosphate, ortho [as P]daily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. coliinstantaneous maximum≤ 406 #/100mLall year
E. colimonthly geometric mean≤ 19.1 BCFU/dall year
Solids, total dissolvedmonthly averagereport only (mg/L)Mar, Jun, Sep, Dec
Solids, total dissolveddaily maximumreport only (mg/L)Mar, Jun, Sep, Dec
Mercury, total recoverablemonthly averagereport only (ug/L)Mar, Jun, Sep, Dec
Mercury, total recoverabledaily maximumreport only (ug/L)Mar, Jun, Sep, Dec
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all 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/ID0020281 · MCP: https://passage-data.com/mcp