BOISE, CITY OF

NPDES permit ID0023981 · Major POTW · effective, expires 2027-06-30 · 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.

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

3values over a limit
4required values missing, on 2 form(s)
3of 61 forms filed late

Last period with anything received: 2026-07-31. Most often over: Toxicity, Chronic (2), Temperature, water deg. centigrade (1).

Reporting

Reports are due about 20 days after each monitoring period ends (read off this permit's own late-day counts in EPA's filings).

Limits in force (153)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeDAILY MX <= 17.1 deg C Jan, Feb, Mar
001Temperature, water deg. centigradeDAILY MX <= 20.8 deg C Apr, May
001Temperature, water deg. centigradeDAILY MX <= 24.4 deg C Jul, Aug, Sep
001Temperature, water deg. centigradeDAILY MX <= 22.5 deg C Oct, Nov, Dec
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 <= 6005 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 9007 lb/d all year
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG report only all year
001BOD, 5-day, 20 deg. CDAILY MX report only all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 30 mg/L all year
001Solids, total suspendedWKLY AVG <= 45 mg/L all year
001Solids, total suspendedMO AVG <= 6005 lb/d all year
001Solids, total suspendedWKLY AVG <= 9007 lb/d all year
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedWKLY AVG report only all year
001Solids, total suspendedDAILY MX report only all year
001Nitrogen, ammonia total [as N]MO AVG report only all year
001Nitrogen, ammonia total [as N]DAILY MX report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Phosphorus, total [as P]MO AVG report only all year
001Cyanide, weak acid, dissociableMO AVG report only all year
001Cyanide, weak acid, dissociableDAILY MX report only all year
001Hardness, total [as CaCO3]MO AVG report only all year
001Hardness, total [as CaCO3]DAILY MX report only all year
001Arsenic, total recoverableMO AVG report only all year
001Arsenic, total recoverableDAILY MX report only all year
001Selenium, total recoverableMO AVG report only Apr, Jun, Sep, Dec
001Selenium, total recoverableDAILY MX report only Apr, Jun, Sep, Dec
001Nickel, total recoverableMO AVG report only Apr, Jun, Sep, Dec
001Nickel, total recoverableDAILY MX report only Apr, Jun, Sep, Dec
001Silver total recoverableMO AVG report only Apr, Jun, Sep, Dec
001Silver total recoverableDAILY MX report only Apr, Jun, Sep, Dec
001Zinc, total recoverableMO AVG report only all year
001Zinc, total recoverableDAILY MX report only all year
001Cadmium, total recoverableMO AVG report only all year
001Cadmium, total recoverableDAILY MX report only all year
001Lead, total recoverableMO AVG report only all year
001Lead, total recoverableDAILY MX report only all year
001Chromium, total recoverableMO AVG report only Apr, Jun, Sep, Dec
001Chromium, total recoverableDAILY MX report only Apr, Jun, Sep, Dec
001Copper, total recoverableMO AVG report only all year
001Copper, total recoverableDAILY MX report only all year
001Phosphorus, total [as P] [per season]ANNL AVG report only Dec
001Flow, in conduit or thru treatment plantMO AVG report only all year
001Flow, in conduit or thru treatment plantDAILY 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
001E. coliMO GEOMN <= 126 #/100mL all year
001E. coliINST MAX <= 406 #/100mL all year
001Mercury, total recoverableMO AVG report only all year
001Mercury, total recoverableDAILY MX report only all year
001Mercury, total recoverableSX report only Jun, Dec
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only Jun, Sep
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Jun, Sep
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only Apr, Dec
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Apr, Dec
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AVG report only Apr, Dec
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AVG report only Jun, Sep
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasDAILY MX report only Apr, Dec
001IC25 Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelasDAILY MX report only Jun, Sep
001NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only Jun, Sep
001NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaMO AVG report only Apr, Dec
001NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Jun, Sep
001NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubiaDAILY MX report only Apr, Dec
001NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AVG report only Jun, Sep
001NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasMO AVG report only Apr, Dec
001NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasDAILY MX report only Jun, Sep
001NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelasDAILY MX report only Apr, Dec
001Toxicity, ChronicMO AVG <= 1.5 toxic Apr, Dec
001Toxicity, ChronicMO AVG <= 2.4 toxic Jun, Sep
001Toxicity, ChronicDAILY MX <= 2.6 toxic Apr, Dec
001Toxicity, ChronicDAILY MX <= 4.2 toxic Jun, Sep
001Static 96Hr Chronic Selen. CapricornutumMO AVG report only Apr, Dec
001Static 96Hr Chronic Selen. CapricornutumMO AVG report only Jun, Sep
001Static 96Hr Chronic Selen. CapricornutumDAILY MX report only Apr, Dec
001Static 96Hr Chronic Selen. CapricornutumDAILY MX report only Jun, Sep
002Temperature, water deg. centigradeMX DA AV report only all year
002Temperature, water deg. centigradeINST MAX report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002pHINST MAX report only all year
002pHINST MIN report only all year
002pHDAILY MX report only all year
002pHINST MIN report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]DLYAVMIN >= 25 lb/d Sep
002Phosphorus, total [as P]MO AVG report only all year
002Phosphorus, total [as P]DAILY MX report only all year
002Phosphorus, total [as P] [credit]MO AVG report only all year
002Phosphorus, total [as P] [credit]ANNL AVG report only Dec
002Flow, in conduit or thru treatment plantINST MAX report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantMX DA AV report only all year
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002E. coliMO GEOMN report only all year
002E. coliMO GEOMN report only all year
REC1Temperature, water deg. centigradeMX DA AV report only all year
REC1Temperature, water deg. centigradeDAILY MX report only all year
REC1TurbidityANNL MAX report only Apr, Jun, Sep, Dec
REC1Oxygen, dissolved [DO]INST MIN report only all year
REC1BOD, 5-day, 20 deg. CDAILY MX report only all year
REC1pHDAILY MX report only all year
REC1pHINST MIN report only all year
REC1Solids, total suspendedDAILY MX report only all year
REC1Oil & GreaseANNL MAX report only Apr, Jun, Sep, Dec
REC1Nitrogen, ammonia total [as N]DAILY MX report only all year
REC1Nitrite + Nitrate total [as N]ANNL MAX report only Apr, Jun, Sep, Dec
REC1Phosphorus, total [as P]DAILY MX report only all year
REC1Cyanide, weak acid, dissociableDAILY MX report only all year
REC1Hardness, total [as CaCO3]DAILY MX report only all year
REC1Arsenic, total recoverableDAILY MX report only all year
REC1Selenium, total recoverableQB report only Apr, Jun, Sep, Dec
REC1Cadmium, dissolved [as Cd]DAILY MX report only all year
REC1Chromium, dissolved [as Cr]QB report only Apr, Jun, Sep, Dec
REC1Copper, dissolved [as Cu]DAILY MX report only all year
REC1Lead, dissolved [as Pb]DAILY MX report only all year
REC1Nickel, dissolved [as Ni]QB report only Apr, Jun, Sep, Dec
REC1Silver total recoverableDAILY MX report only all year
REC1Zinc, dissolved [as Zn]DAILY MX report only all year
REC1Flow, in conduit or thru treatment plantDAILY MX report only all year
REC1Flow, in conduit or thru treatment plantINST MIN report only all year
REC1E. coliDAILY MX report only all year
REC1Nitrogen, Kjeldahl TotalANNL MAX report only Apr, Jun, Sep, Dec
REC1Mercury, total recoverableDAILY MX report only all year
REC2Temperature, water deg. centigradeMX DA AV report only all year
REC2Temperature, water deg. centigradeINST MAX report only all year
REC2Oxygen, dissolved [DO]INST MIN report only all year
REC2pHINST MAX report only all year
REC2pHINST MIN report only all year
REC2Phosphorus, total [as P]MO AVG report only all year
REC2Phosphorus, total [as P]DAILY MX report only all year
REC2Hardness, total [as CaCO3]DAILY MX report only all year
REC2Copper, dissolved [as Cu]MO AVG report only all year
REC2Copper, dissolved [as Cu]DAILY MX report only all year
REC2Zinc, dissolved [as Zn]DAILY MX report only all year
REC2Zinc, total recoverableDAILY MX report only all year
REC2Copper, total recoverableDAILY MX report only all year
REC2Flow, in conduit or thru treatment plantINST MAX report only all year
REC2Flow, in conduit or thru treatment plantINST MIN report only all year
REC3Temperature, water deg. centigradeMX DA AV report only all year
REC3Temperature, water deg. centigradeINST MIN report only all year
REC3Temperature, water deg. centigradeINST MAX report only all year
REC3pHINST MIN report only all year
REC3pHINST MAX report only all year
REC3Phosphorus, total [as P]MO AVG report only all year
SUMPhosphorus, total [as P]ANNL AVG <= 405 lb/d Dec

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states