Mound Septic System Cost in Arizona
Estimated 2026 installed range: $10,500 – $23,100
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Open the cost calculatorWhy Arizona prices differ
Statewide cost drivers here are hard ground, terrain and remote access. Locally, caliche layers can require special excavation equipment. That is why a mound system in Arizona can land well above or below the national range of $10,000–$22,000.
All system types in Arizona
| System | Low | High |
|---|---|---|
| Conventional | $3,700 | $8,400 |
| Chamber | $5,200 | $11,600 |
| Aerobic / ATU | $8,400 | $18,900 |
| Mound | $10,500 | $23,100 |
| Sand filter | $8,400 | $16,800 |
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.