IDAHO FALLS, CITY OF

NPDES permit ID0021261 · Major POTW · administratively continued, expires 2017-10-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

This permit expired on 2017-10-31 and is administratively continued: its last limits keep applying until a new permit is issued, and EPA still expects the reports.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
2required values missing, on 1 form(s)
0of 33 forms filed late

Last period with anything received: 2026-07-31.

Reporting

Reports are due about 20 days after each monitoring period ends (the most common figure among ID permits in EPA's filings — check your permit).

Limits in force (109)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Oxygen, dissolved [DO]MO AVG report only all year
001Oxygen, dissolved [DO]DAILY MX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L all year
001BOD, 5-day, 20 deg. CMO AVG <= 4250 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 6380 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Alkalinity, total [as CaCO3]MO AVG report only all year
001Alkalinity, total [as CaCO3]DAILY MX report only all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 4250 lb/d all year
001Solids, total suspendedWKLY AVG <= 6380 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Nitrogen, ammonia total [as N]MO AVG <= 3.8 mg/L Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 3.4 mg/L Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 14.1 mg/L Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 12.3 mg/L Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 539 lb/d Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 482 lb/d Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 1999 lb/d Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 1744 lb/d Jan, Feb, Mar, Apr, May, Oct, Nov, Dec
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY MX report only all year
001Nitrite + Nitrate total [as N]MO AVG report only all year
001Nitrite + Nitrate total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]WKLY AVG report only all year
001Phosphorus, total [as P]MO AVG <= 391 lb/d all year
001Phosphorus, total [as P]ANNL AVG <= 236 lb/d Dec
001Phosphorus, total [as P]WKLY AVG <= 586 lb/d all year
001Cyanide, total [as CN]MO AVG report only Jun, Dec
001Cyanide, total [as CN]DAILY MX report only Jun, Dec
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total [as As]MO AVG report only Jun, Dec
001Arsenic, total [as As]DAILY MX report only Jun, Dec
001Chromium, total [as Cr]MO AVG report only Jun, Dec
001Chromium, total [as Cr]DAILY MX report only Jun, Dec
001Nickel, total recoverableMO AVG report only Jun, Dec
001Nickel, total recoverableDAILY MX report only Jun, Dec
001Silver total recoverableMO AVG report only Jun, Dec
001Silver total recoverableDAILY MX report only Jun, Dec
001Zinc, total recoverableMO AVG report only Jun, Dec
001Zinc, total recoverableDAILY MX report only Jun, Dec
001Cadmium, total recoverableMO AVG report only Jun, Dec
001Cadmium, total recoverableDAILY MX report only Jun, Dec
001Lead, total recoverableMO AVG report only Jun, Dec
001Lead, total recoverableDAILY MX report only Jun, Dec
001Copper, total recoverableMO AVG report only Jun, Dec
001Copper, total recoverableDAILY MX report only Jun, Dec
001Chromium, hexavalent dissolved [as Cr]MO AVG report only Jun, Dec
001Chromium, hexavalent dissolved [as Cr]DAILY MX report only Jun, Dec
001Oil and greaseMO AVG report only all year
001Oil and greaseDAILY MX report only all year
001Phosphate, ortho [as P]MO AVG report only all year
001Phosphate, ortho [as P]DAILY MX report only all year
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY MX report only all year
001Chlorine, total residualMO AVG <= 90 ug/L all year
001Chlorine, total residualDAILY MX <= 200 ug/L all year
001Chlorine, total residualMO AVG <= 12.8 lb/d all year
001Chlorine, total residualDAILY MX <= 28.4 lb/d all year
001E. coliMO GEO <= 126 #/100mL all year
001E. coliINST MAX <= 406 #/100mL all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Mercury, total recoverableMO AVG report only Jun, Dec
001Mercury, total recoverableDAILY MX report only Jun, Dec
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Toxicity, ChronicMO AVG report only Jun, Dec
001Toxicity, ChronicMO AVG report only May, Dec
001Toxicity, ChronicDAILY MX report only Jun, Dec
001Toxicity, ChronicDAILY MX report only May, Dec
RECTemperature, water deg. centigradeDAILY MX report only all year
RECTemperature, water deg. centigradeINST MAX report only all year
RECTemperature, water deg. centigradeDAILY MX report only all year
RECTemperature, water deg. centigradeINST MAX report only all year
RECOxygen, dissolved [DO]QB report only Mar, Jun, Sep, Dec
RECOxygen, dissolved [DO]QB report only Mar, Jun, Sep, Dec
RECpHINST MIN report only all year
RECpHINST MAX report only all year
RECpHINST MIN report only all year
RECpHINST MAX report only all year
RECAlkalinity, total [as CaCO3]QB report only Mar, Jun, Sep, Dec
RECAlkalinity, total [as CaCO3]QB report only Mar, Jun, Sep, Dec
RECNitrogen, ammonia total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, ammonia total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, nitrite total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, nitrite total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, nitrate total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, nitrate total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, Kjeldahl, total [as N]QB report only Mar, Jun, Sep, Dec
RECNitrogen, Kjeldahl, total [as N]QB report only Mar, Jun, Sep, Dec
RECPhosphorus, total [as P]QB report only Mar, Jun, Sep, Dec
RECPhosphorus, total [as P]QB report only Mar, Jun, Sep, Dec
RECHardness, total [as CaCO3]QB report only Mar, Jun, Sep, Dec
RECHardness, total [as CaCO3]QB report only Mar, Jun, Sep, Dec
RECCopper, dissolved [as Cu]QB report only Mar, Jun, Sep, Dec
RECCopper, dissolved [as Cu]QB report only Mar, Jun, Sep, Dec
RECPhosphate, ortho [as P]QB report only Mar, Jun, Sep, Dec
RECPhosphate, ortho [as P]QB report only Mar, Jun, Sep, Dec
RECMercury, total recoverableQB report only Mar, Jun, Sep, Dec
RECMercury, total recoverableQB report only Mar, Jun, Sep, Dec

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