TOPPENISH, CITY OF

NPDES permit WA0026123 · Minor POTW · effective, expires 2030-12-31 · 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

5values over a limit
0required values missing, on 0 form(s)
0of 20 forms filed late

Last period with anything received: 2026-07-31. Most often over: Nitrogen, ammonia total [as N] (4), Temperature, water deg. centigrade (1).

Reporting

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

Limits in force (93)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMO AVG report only Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Temperature, water deg. centigradeDAILY MX <= 23.5 deg C May, Jun, Jul, Aug, Sep
001Temperature, water deg. centigradeDAILY MX report only Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Oxygen, dissolved [DO]MO AVG report only Jan, Feb, Nov, Dec
001Oxygen, dissolved [DO]MO AVG report only all year
001Oxygen, dissolved [DO]DAILY MX report only Jan, Feb, Nov, Dec
001Oxygen, dissolved [DO]MO MIN report only all year
001Oxygen, dissolved [DO]MO AVG <= 48 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
001Oxygen, dissolved [DO]WKLY AVG <= 82 lb/d Mar, Apr, May, Jun, Jul, Aug, Sep, Oct
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 <= 418 lb/d all year
001BOD, 5-day, 20 deg. CWL <= 627 lb/d all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 8.5 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 <= 418 lb/d all year
001Solids, total suspendedWKLY AVG <= 627 lb/d all year
001Nitrogen, ammonia total [as N]MO AVG <= 1.35 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 1.35 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 6.22 mg/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 5.23 mg/L May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]MO AVG <= 21.5 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]MO AVG <= 21.5 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, ammonia total [as N]DAILY MX <= 86.6 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Nitrogen, ammonia total [as N]DAILY MX <= 72.8 lb/d May, Jun, Jul, Aug, Sep
001Nitrogen, nitrite total [as N]MO AVG <= 10.5 mg/L all year
001Nitrogen, nitrite total [as N]WKLY AVG <= 17.3 mg/L all year
001Nitrogen, nitrite total [as N]MO AVG <= 146 lb/d all year
001Nitrogen, nitrite total [as N]WKLY AVG <= 241 lb/d all year
001Nitrogen, Kjeldahl, total [as N]MO AVG report only all year
001Nitrogen, Kjeldahl, total [as N]DAILY 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 [as As]ANNL AVG report only all year
001Arsenic, total [as As]DAILY MX report only all year
001Lead, total [as Pb]MO AVG <= 2.28 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Lead, total [as Pb]MO AVG <= 3.81 ug/L May, Jun, Jul, Aug, Sep
001Lead, total [as Pb]DAILY MX <= 6.18 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Lead, total [as Pb]DAILY MX <= 10.3 ug/L May, Jun, Jul, Aug, Sep
001Lead, total [as Pb]MO AVG <= .0317 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Lead, total [as Pb]MO AVG <= .0531 lb/d May, Jun, Jul, Aug, Sep
001Lead, total [as Pb]DAILY MX <= .0861 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Lead, total [as Pb]DAILY MX <= .143 lb/d May, Jun, Jul, Aug, Sep
001Silver, total [as Ag]MO AVG <= 2.47 ug/L May, Jun, Jul, Aug, Sep
001Silver, total [as Ag]MO AVG <= 3.38 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Silver, total [as Ag]DAILY MX <= 5.97 ug/L May, Jun, Jul, Aug, Sep
001Silver, total [as Ag]DAILY MX <= 4.93 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Silver, total [as Ag]MO AVG <= .034 lb/d May, Jun, Jul, Aug, Sep
001Silver, total [as Ag]MO AVG <= .047 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Silver, total [as Ag]DAILY MX <= .083 lb/d May, Jun, Jul, Aug, Sep
001Silver, total [as Ag]DAILY MX <= .069 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Zinc, total [as Zn]MO AVG <= 55.54 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Zinc, total [as Zn]MO AVG <= 63.14 ug/L May, Jun, Jul, Aug, Sep
001Zinc, total [as Zn]DAILY MX <= 116.6 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Zinc, total [as Zn]DAILY MX <= 123.2 ug/L May, Jun, Jul, Aug, Sep
001Zinc, total [as Zn]MO AVG <= .883 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Zinc, total [as Zn]MO AVG <= .883 lb/d May, Jun, Jul, Aug, Sep
001Zinc, total [as Zn]DAILY MX <= 1.628 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Zinc, total [as Zn]DAILY MX <= 1.716 lb/d May, Jun, Jul, Aug, Sep
001Copper, total recoverableMO AVG <= 10.34 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Copper, total recoverableMO AVG <= 9.71 ug/L May, Jun, Jul, Aug, Sep
001Copper, total recoverableDAILY MX <= 17.38 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Copper, total recoverableDAILY MX <= 16.3 ug/L May, Jun, Jul, Aug, Sep
001Copper, total recoverableMO AVG <= .143 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Copper, total recoverableMO AVG <= .14 lb/d May, Jun, Jul, Aug, Sep
001Copper, total recoverableDAILY MX <= .242 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Copper, total recoverableDAILY MX <= .23 lb/d May, Jun, Jul, Aug, Sep
001Selenium, total [as Se]MO AVG <= 4.24 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Selenium, total [as Se]MO AVG <= 7.08 ug/L May, Jun, Jul, Aug, Sep
001Selenium, total [as Se]DAILY MX <= 11.5 ug/L Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Selenium, total [as Se]DAILY MX <= 19.2 ug/L May, Jun, Jul, Aug, Sep
001Selenium, total [as Se]MO AVG <= .0591 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Selenium, total [as Se]MO AVG <= .0986 lb/d May, Jun, Jul, Aug, Sep
001Selenium, total [as Se]DAILY MX <= .16 lb/d Jan, Feb, Mar, Apr, Oct, Nov, Dec
001Selenium, total [as Se]DAILY MX <= .267 lb/d May, Jun, Jul, Aug, Sep
001E. coli, MTEC-MFGEO MEAN <= 100 CFU/100mL all year
001E. coli, MTEC-MFINST MAX <= 320 CFU/100mL 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
001PER-AND POLYFLUOROALKYL SUBSTANCESANNL AVG report only all year
001PER-AND POLYFLUOROALKYL SUBSTANCESDAILY MX report only all year
001PER-AND POLYFLUOROALKYL SUBSTANCESANNL AVG report only all year
001PER-AND POLYFLUOROALKYL SUBSTANCESDAILY MX report only all year
001PER-AND POLYFLUOROALKYL SUBSTANCESANNL AVG report only all year
001PER-AND POLYFLUOROALKYL SUBSTANCESDAILY MX report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001BOD, 5-day, percent removalMO AV MN >= 85 % all year
001Solids, suspended percent removalMO AV MN >= 85 % all year

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