Port Of Sunnyside Industrial WWTF
Sunnyside, WA · Yakima County · Publicly Owned Treatment Works
- Average flow
- 1.17 MGD
- Design flow
- 8.1 MGD
- NPDES permit
- WA0052426
- Administratively continued
- Permit expires
- August 2019
- Population served
- —
- CWNS 2022
Port Of Sunnyside Industrial WWTF is a publicly owned wastewater treatment works in Sunnyside, Yakima County, Washington treating an average of 1.17 million gallons per day against a permitted design capacity of 8.1 MGD. Treatment on site includes aerated lagoons, covered lagoons. It discharges under NPDES permit WA0052426 (administratively continued), which expires in August 2019, with 79 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 79
- Effluent violations
- 31
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
4 verified contacts for Port Of Sunnyside Industrial WWTF, with validated emails and direct phone numbers.
Unlock 4 verified contacts (1 more than shown)
Names, validated emails and direct phone numbers for decision-makers at Port Of Sunnyside Industrial WWTF, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Washington
Sunnyside · 1 mi away
1.31 MGD
Mabton · 5 mi away
—
Grandview · 8 mi away
—
Granger · 9 mi away
—
Prosser · 13 mi away
—
Zillah · 14 mi away
—
Toppenish · 14 mi away
0.67 MGD
Toppenish · 16 mi away
0.06 MGD
Port Of Sunnyside Industrial WWTF: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 13, 2026.