Mound Septic System Cost in Oregon
Estimated 2026 installed range: $12,200 – $26,800
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Open the cost calculatorWhy Oregon prices differ
Statewide cost drivers here are hard ground, terrain and remote access. Locally, wet winters and strict DEQ rules require careful siting. That is why a mound system in Oregon can land well above or below the national range of $10,000–$22,000.
All system types in Oregon
| System | Low | High |
|---|---|---|
| Conventional | $4,300 | $9,800 |
| Chamber | $6,100 | $13,400 |
| Aerobic / ATU | $9,800 | $22,000 |
| Mound | $12,200 | $26,800 |
| Sand filter | $9,800 | $19,500 |
What mound systems are for
A mound system raises the drain field above the ground when the water table is high or soil is shallow. It is one of the most expensive common options.