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Wapato, City of

Sewage treatment plant, major discharger, Wapato, Washington. NPDES permit WA0050229, in force until Sep 30, 2028. Last 12 months: over a limit 48 times (last August 2026), 1 of 12 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 20 days after each period: form A monthly (48 values), form Y yearly
Renewal application due
Apr 3, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
70 values over a limit, 12 required values missing, 2 of 13 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 48 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], daily maximum18 mg/L≤ 2.6 mg/L592%
October 2025Nitrogen, ammonia total [as N], daily maximum83.3 lb/d≤ 25 lb/d233%
October 2025Nitrogen, ammonia total [as N], monthly average25.14 lb/d≤ 7 lb/d259%
October 2025Nitrogen, ammonia total [as N], monthly average5.3 mg/L≤ .7 mg/L657%
October 2025Zinc, total recoverable, daily maximum.925 lb/d≤ .5 lb/d85%
October 2025Zinc, total recoverable, daily maximum200 ug/L≤ 52 ug/L285%
October 2025Zinc, total recoverable, monthly average.34 lb/d≤ .24 lb/d42%
October 2025Zinc, total recoverable, monthly average69.8 ug/L≤ 25 ug/L179%
November 2025Zinc, total recoverable, daily maximum70 ug/L≤ 52 ug/L35%
November 2025Zinc, total recoverable, monthly average.276 lb/d≤ .24 lb/d15%
November 2025Zinc, total recoverable, monthly average56.25 ug/L≤ 25 ug/L125%
December 2025Zinc, total recoverable, daily maximum.609 lb/d≤ .5 lb/d22%
December 2025Zinc, total recoverable, daily maximum672 ug/L≤ 52 ug/L1192%
December 2025Zinc, total recoverable, monthly average2.36 lb/d≤ .24 lb/d883%
December 2025Zinc, total recoverable, monthly average262.6 ug/L≤ 25 ug/L950%
January 2026Zinc, total recoverable, daily maximum1.18 lb/d≤ .5 lb/d136%
January 2026Zinc, total recoverable, daily maximum250 ug/L≤ 52 ug/L381%
January 2026Zinc, total recoverable, monthly average.569 lb/d≤ .24 lb/d137%
January 2026Zinc, total recoverable, monthly average119 ug/L≤ 25 ug/L376%
February 2026Zinc, total recoverable, daily maximum1.28 lb/d≤ .5 lb/d156%
February 2026Zinc, total recoverable, daily maximum270 ug/L≤ 52 ug/L419%
February 2026Zinc, total recoverable, monthly average.628 lb/d≤ .24 lb/d162%
February 2026Zinc, total recoverable, monthly average140 ug/L≤ 25 ug/L460%
March 2026Zinc, total recoverable, daily maximum62 ug/L≤ 52 ug/L19%
March 2026Zinc, total recoverable, monthly average49.75 ug/L≤ 25 ug/L99%
April 2026Nitrogen, ammonia total [as N], daily maximum4.1 mg/L≤ 2.6 mg/L58%
April 2026Nitrogen, ammonia total [as N], monthly average.82 mg/L≤ .7 mg/L17%
April 2026Zinc, total recoverable, daily maximum.6 lb/d≤ .5 lb/d20%
April 2026Zinc, total recoverable, daily maximum140 ug/L≤ 52 ug/L169%
April 2026Zinc, total recoverable, monthly average.27 lb/d≤ .24 lb/d13%
April 2026Zinc, total recoverable, monthly average63 ug/L≤ 25 ug/L152%
May 2026Nitrogen, ammonia total [as N], daily maximum29.3 lb/d≤ 25 lb/d17%
May 2026Nitrogen, ammonia total [as N], daily maximum6.4 mg/L≤ 2.6 mg/L146%
May 2026Nitrogen, ammonia total [as N], monthly average1.6 mg/L≤ .7 mg/L129%
May 2026Nitrogen, ammonia total [as N], monthly average7.3 lb/d≤ 7 lb/d4%
May 2026Zinc, total recoverable, daily maximum69 ug/L≤ 52 ug/L33%
May 2026Zinc, total recoverable, monthly average41 ug/L≤ 25 ug/L64%
June 2026Zinc, total recoverable, daily maximum.99 lb/d≤ .5 lb/d98%
June 2026Zinc, total recoverable, daily maximum180 ug/L≤ 52 ug/L246%
June 2026Zinc, total recoverable, monthly average.58 lb/d≤ .24 lb/d142%
June 2026Zinc, total recoverable, monthly average118 ug/L≤ 25 ug/L372%
July 2026Zinc, total recoverable, daily maximum.7 lb/d≤ .5 lb/d40%
July 2026Zinc, total recoverable, daily maximum130 ug/L≤ 52 ug/L150%
July 2026Zinc, total recoverable, monthly average.29 lb/d≤ .24 lb/d21%
July 2026Zinc, total recoverable, monthly average74 ug/L≤ 25 ug/L196%
August 2026Zinc, total recoverable, daily maximum.58 lb/d≤ .5 lb/d16%
August 2026Zinc, total recoverable, daily maximum140 ug/L≤ 52 ug/L169%
August 2026Zinc, total recoverable, monthly average52 ug/L≤ 25 ug/L108%

Limits in force (60)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Oxygen, dissolved [DO]instantaneous minimumreport only (mg/L)all year
Oxygen, dissolved [DO]monthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 290 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 435 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cmonthly averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cweekly averagereport only (lb/d)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 290 lb/dall year
Solids, total suspendedweekly average≤ 435 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Solids, total suspendedweekly averagereport only (mg/L)all year
Solids, total suspendedmonthly averagereport only (lb/d)all year
Solids, total suspendedweekly averagereport only (lb/d)all year
Nitrogen, total [as N]monthly averagereport only (ug/L)all year
Nitrogen, total [as N]daily maximumreport only (ug/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]daily maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ .7 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LJan, Feb, Mar, Jun, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 2.6 mg/LApr–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 5.4 mg/LJan, Feb, Mar, Jun, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 7 lb/dApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 10.4 lb/dJan, Feb, Mar, Jun, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 25 lb/dApr–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 52.3 lb/dJan, Feb, Mar, Jun, Nov, Dec
Phosphorus, total [as P]monthly averagereport only (ug/L)all year
Phosphorus, total [as P]daily maximumreport only (ug/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]daily maximumreport only (lb/d)all year
Zinc, total recoverablemonthly average≤ 25 ug/Lall year
Zinc, total recoverabledaily maximum≤ 52 ug/Lall year
Zinc, total recoverablemonthly average≤ .24 lb/dall year
Zinc, total recoverabledaily maximum≤ .5 lb/dall year
Copper, total recoverablemonthly averagereport only (ug/L)all year
Copper, total recoverabledaily maximumreport only (ug/L)all year
Copper, total recoverablemonthly averagereport only (lb/d)all year
Copper, total recoverabledaily maximumreport only (lb/d)all year
E. coli, MTEC-MFgeometric mean≤ 100 CFU/100mLall year
E. coli, MTEC-MFinstantaneous maximum≤ 200 CFU/100mLall year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
PER-AND POLYFLUOROALKYL SUBSTANCESannual averagereport only (ng/L)all year
PER-AND POLYFLUOROALKYL SUBSTANCESdaily maximumreport only (ng/L)all year
PER-AND POLYFLUOROALKYL SUBSTANCESannual averagereport only (ng/L)all year
PER-AND POLYFLUOROALKYL SUBSTANCESdaily maximumreport only (ng/L)all year
PER-AND POLYFLUOROALKYL SUBSTANCESmonthly averagereport only (mg/kg)all year
PER-AND POLYFLUOROALKYL SUBSTANCESdaily maximumreport only (mg/kg)all year
Toxicity [acute], Ceriodaphnia dubiadaily maximumreport only (toxic)all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximumreport only (toxic)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

Cited limits by parameter: Washington's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/WA0050229 · MCP: https://passage-data.com/mcp