Independence STP
N Ash St And N Williams St, Independence, OR 97351 · Polk County · Publicly Owned Treatment Works
- Average flow
- 1.02 MGD
- Design flow
- 0.6 MGD
- NPDES permit
- OR0020443
- Effective
- Permit expires
- August 2027
- Population served
- 11,355
- CWNS 2022
Independence STP is a publicly owned wastewater treatment works in Independence, Polk County, Oregon treating an average of 1.02 million gallons per day against a permitted design capacity of 0.6 MGD, serving about 11,355 residents. It discharges under NPDES permit OR0020443 (effective), which expires in August 2027, with 10 recorded violations in the last three years.
Treatment technology
One treatment structure or unit process identified at Independence STP.
Available with a free Klarifi account
See the full treatment train at Independence STP: structures, unit processes and planned upgrades, with exact unit counts.
Compliance snapshot (last 3 years)
- Total violations
- 10
- Effluent violations
- 10
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Independence STP.
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Nearby wastewater treatment plants in Oregon
Monmouth · 1 mi away
1.56 MGD
Rickreall · 5 mi away
2.77 MGD
Falls City · 11 mi away
0.04 MGD
Corvallis · 13 mi away
0.29 MGD
Salem · 13 mi away
42.45 MGD
Jefferson · 13 mi away
0.37 MGD
Aumsville · 16 mi away
0.65 MGD
Albany · 16 mi away
8.27 MGD
Independence 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 August 17, 2026.
Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Oxidation ditch · Anaerobic digester · all terms