Mound Septic System Cost in Hawaii
Estimated 2026 installed range: $14,500 – $31,900
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Open the cost calculatorWhy Hawaii prices differ
Statewide cost drivers here are hard ground, terrain and remote access. Locally, island logistics and strict coastal rules raise costs sharply. That is why a mound system in Hawaii can land well above or below the national range of $10,000–$22,000.
All system types in Hawaii
| System | Low | High |
|---|---|---|
| Conventional | $5,100 | $11,600 |
| Chamber | $7,200 | $16,000 |
| Aerobic / ATU | $11,600 | $26,100 |
| Mound | $14,500 | $31,900 |
| Sand filter | $11,600 | $23,200 |
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.