Amity STP
401 E 3rd Ave, Amity, OR 97101 · Yamhill County · Publicly Owned Treatment Works
- Average flow
- 0.29 MGD
- Design flow
- 0.9 MGD
- NPDES permit
- OR0026212
- Effective
- Permit expires
- February 2030
- Population served
- 1,747
- CWNS 2022
Amity STP is a publicly owned wastewater treatment works in Amity, Yamhill County, Oregon treating an average of 0.29 million gallons per day against a permitted design capacity of 0.9 MGD, serving about 1,747 residents. It discharges under NPDES permit OR0026212 (effective), which expires in February 2030, with 34 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Amity STP.
Available with a free Klarifi account
See the full treatment train at Amity STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 34
- Effluent violations
- 22
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Amity STP.
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Nearby wastewater treatment plants in Oregon
Mcminnville · 7 mi away
4.99 MGD
Sheridan · 9 mi away
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Lafayette · 9 mi away
0.42 MGD
Dayton · 10 mi away
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Salem · 10 mi away
42.45 MGD
Carlton · 12 mi away
0.45 MGD
Brooks · 12 mi away
0.19 MGD
Willamina · 14 mi away
0.48 MGD
Amity 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 October 9, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Anaerobic digester · Lift station · all terms