City of Zillah

NPDES permit WA0020168 · Minor POTW · effective, expires 2030-10-31 · 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.

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

0values over a limit
0required values missing, on 0 form(s)
0of 25 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 WA permits in EPA's filings — check your permit).

Limits in force (36)

OutfallParameterStatisticLimitMonths
001Temperature, water deg. centigradeMAXIMUM report only (alert) all year
001Temperature, water deg. centigradeMO AVG report only (alert) all year
001Oxygen, dissolved [DO]MINIMUM report only (alert) all year
001Oxygen, dissolved [DO]MO AVG report only (alert) 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 <= 122.6 lb/d all year
001BOD, 5-day, 20 deg. CWKLY AVG <= 183.9 lb/d all year
001pHMAXIMUM <= 9 SU all year
001pHMINIMUM >= 6 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 <= 122.6 lb/d all year
001Solids, total suspendedWKLY AVG <= 183.9 lb/d all year
001Nitrogen, ammonia total [as N]MAXIMUM report only (alert) all year
001Nitrogen, ammonia total [as N]MO AVG report only (alert) all year
001Nitrogen, ammonia total [as N]MAXIMUM report only (alert) all year
001Nitrogen, ammonia total [as N]MO AVG report only (alert) all year
001BOD, percent removal [total]MO AV MN >= 85 % all year
001Coliform, fecal generalMO GEOMN <= 200 #/100mL all year
001Coliform, fecal generalWK GEOMN <= 400 #/100mL all year
001Solids, suspended percent removalMO AV MN >= 85 % all year
003Oil and grease, hexane extr methodSingle Rdg report only (alert) all year
003Nitrogen, Kjeldahl, total [as N]Single Rdg report only (alert) all year
003Nitrite + Nitrate total [as N]Single Rdg report only (alert) all year
003Phosphorus, total [as P]Single Rdg report only (alert) all year
003Hardness, total [as CaCO3]Single Rdg report only (alert) all year
003E. coliSingle Rdg report only (alert) all year
003Solids, total dissolvedSingle Rdg report only (alert) all year
IN1BOD, 5-day, 20 deg. CMO AVG report only (alert) all year
IN1BOD, 5-day, 20 deg. CAVERAGE report only (alert) all year
IN1Solids, total suspendedMO AVG report only (alert) all year
IN1Solids, total suspendedAVERAGE report only (alert) all year
IN1FlowDAILY MX report only (alert) all year
IN1FlowMO AVG report only (alert) all year
IN1FlowMO TOTAL report only (alert) 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