Mabton Wastewater Treatment Plant
Mabton, WA · Yakima County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.57 MGD
- NPDES permit
- WA0020648
- Effective
- Permit expires
- July 2031
- Population served
- 2,621
- CWNS 2022
Mabton Wastewater Treatment Plant is a publicly owned wastewater treatment works in Mabton, Yakima County, Washington, serving about 2,621 residents. Treatment on site includes clarifiers, uncovered lagoons, carrousels / oxidation ditches. It discharges under NPDES permit WA0020648 (effective), which expires in July 2031, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Uncovered lagoons
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Carrousels / oxidation ditches
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Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mabton Wastewater Treatment Plant.
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Nearby wastewater treatment plants in Washington
Grandview · 4 mi away
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Sunnyside · 5 mi away
1.17 MGD
Sunnyside · 6 mi away
1.31 MGD
Prosser · 11 mi away
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Granger · 12 mi away
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Toppenish · 17 mi away
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Zillah · 17 mi away
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Toppenish · 20 mi away
0.06 MGD
Mabton Wastewater Treatment Plant: 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 November 29, 2025.