Willow Lake WWTP
Salem, OR · Marion County · Publicly Owned Treatment Works
- Average flow
- 24.62 MGD
- Design flow
- —
- NPDES permit
- ORL026409
- Effective
- Permit expires
- December 2030
- Population served
- 284,938
- CWNS 2022
Willow Lake WWTP is a publicly owned wastewater treatment works in Salem, Marion County, Oregon treating an average of 24.62 million gallons per day, serving about 284,938 residents. Treatment on site includes clarifiers, carrousels / oxidation ditches, biogas silos. It discharges under NPDES permit ORL026409 (effective), which expires in December 2030, with 2 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 2
- Effluent violations
- 2
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Salem
Salem's capital improvement plan lists 68 water, sewer and wastewater line items worth $166M starting 2025–2029. The largest budgeted items are shown here.
All water and sewer capital projects in Salem →
| Project | Budget | Years |
|---|---|---|
| Willow Lake Water Pollution Control Facility (WPCF) - South Secondary Clarifiers | $12,932,700 | 2027–2029 |
| Geren Island Access Bridge Repairs | $12,200,000 | 2026–2029 |
| Willow Lake Water Pollution Control Facility (WPCF) South Primary Clarifier Improvements | $10,144,340 | 2027–2030 |
| Franzen Reservoir Cover and Liner Replacement | $8,100,000 | 2026–2027 |
| Miscellaneous Water System Rehabilitation and Replacement Projects | $7,750,000 | 2026–2030 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
3 verified contacts for Willow Lake WWTP, with validated emails and direct phone numbers.
Unlock 3 verified contacts
Names, validated emails and direct phone numbers for decision-makers at Willow Lake WWTP, plus the full compliance history and discharge data.
Nearby wastewater treatment plants in Oregon
Brooks · 5 mi away
0.05 MGD
Amity · 10 mi away
—
Gervais · 11 mi away
0.13 MGD
Rickreall · 12 mi away
1.42 MGD
Mount Angel · 12 mi away
—
Independence · 13 mi away
0.47 MGD
Monmouth · 13 mi away
0.79 MGD
Aumsville · 14 mi away
0.3 MGD
Willow Lake WWTP: 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 March 4, 2025.