Adair Village STP
Corvallis, OR · Benton County · Publicly Owned Treatment Works
- Average flow
- 0.1 MGD
- Design flow
- 0.32 MGD
- NPDES permit
- OR0023396
- Expired
- Permit expires
- May 2011
- Population served
- 165
- CWNS 2022
Adair Village STP is a publicly owned wastewater treatment works in Corvallis, Benton County, Oregon treating an average of 0.1 million gallons per day against a permitted design capacity of 0.32 MGD, serving about 165 residents. Treatment on site includes clarifiers, biogas silos. It discharges under NPDES permit OR0023396 (expired), which expires in May 2011, with 3 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
- 3
- 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 Adair Village STP.
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Nearby wastewater treatment plants in Oregon
Albany · 7 mi away
4.59 MGD
Tangent · 9 mi away
0.09 MGD
Jefferson · 10 mi away
0.17 MGD
Corvallis · 13 mi away
0.43 MGD
Independence · 13 mi away
0.47 MGD
Monmouth · 13 mi away
0.79 MGD
Falls City · 17 mi away
0.009 MGD
Rickreall · 17 mi away
1.42 MGD
Adair Village 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 28, 2025.