Dayton STP
Dayton, OR · Yamhill County · Publicly Owned Treatment Works
- Average flow
- 0.16 MGD
- Design flow
- 0.23 MGD
- NPDES permit
- OR0023639
- Administratively continued
- Permit expires
- November 2015
- Population served
- 3,021
- CWNS 2022
Dayton STP is a publicly owned wastewater treatment works in Dayton, Yamhill County, Oregon treating an average of 0.16 million gallons per day against a permitted design capacity of 0.23 MGD, serving about 3,021 residents. Treatment on site includes aerated lagoons, uncovered lagoons. It discharges under NPDES permit OR0023639 (administratively continued), which expires in November 2015, with 10 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
- 10
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Dayton STP.
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Nearby wastewater treatment plants in Oregon
Lafayette · 2 mi away
0.27 MGD
Mcminnville · 4 mi away
2.73 MGD
Dundee · 5 mi away
—
Carlton · 7 mi away
0.2 MGD
Yamhill · 10 mi away
0.07 MGD
Amity · 10 mi away
—
Gervais · 12 mi away
0.13 MGD
Hubbard · 13 mi away
0.17 MGD
Dayton 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 18, 2025.