Heppner STP
Heppner, OR · Morrow County · Publicly Owned Treatment Works
- Average flow
- 0.07 MGD
- Design flow
- 0.25 MGD
- NPDES permit
- OR0020770
- Administratively continued
- Permit expires
- August 2026
- Population served
- 1,295
- CWNS 2022
Heppner STP is a publicly owned wastewater treatment works in Heppner, Morrow County, Oregon treating an average of 0.07 million gallons per day against a permitted design capacity of 0.25 MGD, serving about 1,295 residents. Treatment on site includes clarifiers. It discharges under NPDES permit OR0020770 (administratively continued), which expires in August 2026, with 1 recorded violation in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 1
- 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 Heppner STP.
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Nearby wastewater treatment plants in Oregon
Stanfield · 33 mi away
0.15 MGD
Hermiston · 36 mi away
1.56 MGD
Arlington · 40 mi away
0.05 MGD
Umatilla · 40 mi away
0.72 MGD
Long Creek · 50 mi away
0.03 MGD
Athena · 60 mi away
0.1 MGD
Dayville · 62 mi away
0.02 MGD
Biggs · 65 mi away
0.03 MGD
Heppner 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 February 27, 2025.