Elgin STP
Or-82, Elgin, OR 97827 · Union County · Publicly Owned Treatment Works
- Average flow
- 0.2 MGD
- Design flow
- 0.36 MGD
- NPDES permit
- OR0022438
- Administratively continued
- Permit expires
- October 2009
- Population served
- 1,730
- CWNS 2022
Elgin STP is a publicly owned wastewater treatment works in Elgin, Union County, Oregon treating an average of 0.2 million gallons per day against a permitted design capacity of 0.36 MGD, serving about 1,730 residents. It discharges under NPDES permit OR0022438 (administratively continued), which expires in October 2009, with 0 recorded violations in the last three years.
Treatment technology
2 treatment structures and unit processes identified at Elgin STP.
Available with a free Klarifi account
See the full treatment train at Elgin STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 0
- 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 Elgin STP.
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Nearby wastewater treatment plants in Oregon
Wallowa · 18 mi away
0.1 MGD
Union · 25 mi away
0.14 MGD
Enterprise · 32 mi away
0.24 MGD
Athena · 33 mi away
0.2 MGD
Joseph · 36 mi away
0.15 MGD
North Powder · 38 mi away
0.05 MGD
Stanfield · 65 mi away
—
Hermiston · 71 mi away
1.48 MGD
Elgin 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 February 10, 2025.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biosolids · Filter press · all terms