Carlton STP
NW Meadowlake Rd, Carlton, OR 97111 · Yamhill County · Publicly Owned Treatment Works
- Average flow
- 0.45 MGD
- Design flow
- 0.17 MGD
- NPDES permit
- OR0020541
- Administratively continued
- Permit expires
- June 2015
- Population served
- 2,319
- CWNS 2022
Carlton STP is a publicly owned wastewater treatment works in Carlton, Yamhill County, Oregon treating an average of 0.45 million gallons per day against a permitted design capacity of 0.17 MGD, serving about 2,319 residents. It discharges under NPDES permit OR0020541 (administratively continued), which expires in June 2015, with 66 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Carlton STP.
Available with a free Klarifi account
See the full treatment train at Carlton STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 66
- Effluent violations
- 13
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Carlton STP.
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Nearby wastewater treatment plants in Oregon
Yamhill · 3 mi away
0.25 MGD
Mcminnville · 5 mi away
4.99 MGD
Lafayette · 5 mi away
0.42 MGD
Dayton · 7 mi away
—
Dundee · 9 mi away
0.33 MGD
Amity · 12 mi away
0.29 MGD
Sheridan · 17 mi away
—
Gervais · 19 mi away
0.41 MGD
Carlton 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 October 26, 2026; facility record last updated November 7, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms