HERMISTON, CITY OF

NPDES permit OR0020761 · Major POTW · effective, expires 2028-01-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 67 forms filed late

Last period with anything received: 2026-08-31.

Reporting

Reports are due about 15 days after each monitoring period ends (the most common figure among OR permits in EPA's filings — check your permit).

Limits in force (133)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only all year
001Temperature, water deg. centigradeDAILY MX report only all year
001Temperature, water deg. centigradeMO MAX report only all year
001Temperature, water deg. centigradeMX 7D AV report only all year
001Flow rateMO MAX report only all year
001BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG <= 490 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CMO AVG <= 740 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CDAILY MX <= 980 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CDAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CMO AVG report only all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001BOD, 5-day, 20 deg. CWKLY AVG <= 740 lb/d May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, 20 deg. CWKLY AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001pHDAILY MN >= 6.1 SU all year
001pHDAILY MX <= 9 SU all year
001pHMO MIN report only all year
001pHMO MAX report only all year
001pHMO MAX report only all year
001Alkalinity, total [as CaCO3]MO MAX report only all year
001Alkalinity, total [as CaCO3]MO MAX report only all year
001Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 740 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedMO AVG <= 490 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedDAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedDAILY MX <= 980 lb/d May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG report only all year
001Solids, total suspendedMO AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
001Solids, total suspendedMO AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
001Solids, total suspendedWKLY AVG <= 740 lb/d May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]MO AVG <= 94 mg/L May, Jun, Jul, Aug, Sep, Oct
001Nitrogen, ammonia total [as N]DAILY MX <= 130 mg/L May, Jun, Jul, Aug, Sep, Oct
001Hardness, total [as CaCO3]MO MAX report only all year
001DichlorobromomethaneMO AVG report only all year
001DichlorobromomethaneDAILY 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
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 <= .05 mg/L all year
001Chlorine, total residualDAILY MX <= .05 mg/L all year
001E. coliMO GEO <= 126 #/100mL all year
001E. coliDAILY MX <= 406 #/100mL all year
001E. coliMO GEO <= 126 #/100mL all year
001E. coliDAILY MX report only all year
001Excess thermal loadMX 7D AV <= 11.9 mkcal/day May, Jun, Jul, Aug, Sep, Oct
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
001Chlorine usageMO AVG report only all year
002Temperature, water deg. centigradeMO AVG report only all year
002Temperature, water deg. centigradeDAILY MX report only all year
002Temperature, water deg. centigradeMX 7D AV report only all year
002BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CMO AVG <= 490 lb/d May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CMO AVG <= 740 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CDAILY MX <= 980 lb/d May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CDAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CWKLY AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002BOD, 5-day, 20 deg. CWKLY AVG <= 740 lb/d May, Jun, Jul, Aug, Sep, Oct
002BOD, 5-day, 20 deg. CWKLY AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002pHDAILY MN >= 6.1 SU all year
002pHDAILY MX <= 9 SU all year
002Alkalinity, total [as CaCO3]MO MAX report only all year
002Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
002Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002Solids, total suspendedMO AVG <= 490 lb/d May, Jun, Jul, Aug, Sep, Oct
002Solids, total suspendedMO AVG <= 740 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002Solids, total suspendedDAILY MX <= 980 lb/d May, Jun, Jul, Aug, Sep, Oct
002Solids, total suspendedDAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002Solids, total suspendedWKLY AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
002Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
002Solids, total suspendedWKLY AVG <= 740 lb/d May, Jun, Jul, Aug, Sep, Oct
002Solids, total suspendedWKLY AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
002Nitrogen, ammonia total [as N]MO MAX report only May, Jun, Jul, Aug, Sep, Oct
002Flow, in conduit or thru treatment plantMO AVG report only all year
002Flow, in conduit or thru treatment plantDAILY MX report only all year
002Chlorine, total residualMO AVG report only all year
002Chlorine, total residualDAILY MX report only all year
002E. coliMO GEOMN <= 126 #/100mL all year
002E. coliDAILY MX <= 406 #/100mL all year
002E. coliMO GEOMN <= 126 #/100mL all year
002E. coliDAILY MX report only all year
002BOD, 5-day, percent removalMO AV MN >= 85 % all year
002Solids, suspended percent removalMO AV MN >= 85 % all year
002Chlorine usageMO AVG report only all year
003Temperature, water deg. centigradeMO AVG report only all year
003Temperature, water deg. centigradeDAILY MX report only all year
003Temperature, water deg. centigradeMX 7D AV report only all year
003BOD, 5-day, 20 deg. CMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
003BOD, 5-day, 20 deg. CMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
003BOD, 5-day, 20 deg. CMO AVG <= 490 lb/d May, Jun, Jul, Aug, Sep, Oct
003BOD, 5-day, 20 deg. CMO AVG <= 740 lb/d Jan, Feb, Mar, Apr, Nov, Dec
003BOD, 5-day, 20 deg. CDAILY MX <= 980 lb/d May, Jun, Jul, Aug, Sep, Oct
003BOD, 5-day, 20 deg. CDAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
003BOD, 5-day, 20 deg. CWKLY AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
003BOD, 5-day, 20 deg. CWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
003BOD, 5-day, 20 deg. CWKLY AVG <= 740 lb/d May, Jun, Jul, Aug, Sep, Oct
003BOD, 5-day, 20 deg. CWKLY AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
003pHMO MIN >= 6.1 SU all year
003pHMO MAX <= 9 SU all year
003Alkalinity, total [as CaCO3]MO MAX report only all year
003Solids, total suspendedMO AVG <= 20 mg/L May, Jun, Jul, Aug, Sep, Oct
003Solids, total suspendedMO AVG <= 30 mg/L Jan, Feb, Mar, Apr, Nov, Dec
003Solids, total suspendedMO AVG <= 490 lb/d May, Jun, Jul, Aug, Sep, Oct
003Solids, total suspendedMO AVG <= 740 lb/d Jan, Feb, Mar, Apr, Nov, Dec
003Solids, total suspendedDAILY MX <= 980 lb/d May, Jun, Jul, Aug, Sep, Oct
003Solids, total suspendedDAILY MX <= 1500 lb/d Jan, Feb, Mar, Apr, Nov, Dec
003Solids, total suspendedWKLY AVG <= 30 mg/L May, Jun, Jul, Aug, Sep, Oct
003Solids, total suspendedWKLY AVG <= 45 mg/L Jan, Feb, Mar, Apr, Nov, Dec
003Solids, total suspendedWKLY AVG <= 740 lb/d May, Jun, Jul, Aug, Sep, Oct
003Solids, total suspendedWKLY AVG <= 1100 lb/d Jan, Feb, Mar, Apr, Nov, Dec
003Nitrogen, ammonia total [as N]MO AVG <= 94 mg/L May, Jun, Jul, Aug, Sep, Oct
003Nitrogen, ammonia total [as N]DAILY MX <= 130 mg/L May, Jun, Jul, Aug, Sep, Oct
003Hardness, total [as CaCO3]MO MAX report only all year
003DichlorobromomethaneMO AVG report only all year
003DichlorobromomethaneDAILY MX report only all year
003Flow, in conduit or thru treatment plantMO AVG report only all year
003Flow, in conduit or thru treatment plantDAILY MX report only all year
003Chlorine, total residualMO AVG <= .05 mg/L all year
003Chlorine, total residualDAILY MX <= .05 mg/L all year
003E. coliMO GEO <= 126 #/100mL all year
003E. coliDAILY MX <= 406 #/100mL all year
003E. coliMO GEO <= 126 #/100mL all year
003E. coliDAILY MX report only all year
003BOD, 5-day, percent removalMO AV MN >= 85 % all year
003Solids, suspended percent removalMO AV MN >= 85 % all year
003Chlorine usageMO AVG report only all year

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