Naches STP
Naches, WA · Yakima County · Publicly Owned Treatment Works
- Average flow
- —
- Design flow
- 0.54 MGD
- NPDES permit
- WA0022586
- Administratively continued
- Permit expires
- September 2019
- Population served
- 830
- CWNS 2022
Naches STP is a publicly owned wastewater treatment works in Naches, Yakima County, Washington, serving about 830 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches. It discharges under NPDES permit WA0022586 (administratively continued), which expires in September 2019, with 41 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
- 41
- Effluent violations
- 41
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Naches STP.
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Nearby wastewater treatment plants in Washington
Yakima · 15 mi away
—
Ellensburg · 18 mi away
—
Kittitas · 22 mi away
—
Harrah · 23 mi away
0.03 MGD
Zillah · 28 mi away
—
Toppenish · 30 mi away
0.06 MGD
Zillah · 31 mi away
—
Toppenish · 31 mi away
0.67 MGD
Naches STP: 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 20, 2025.