Mound Septic System Cost in Rhode Island
Estimated 2026 installed range: $12,800 – $28,200
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Open the cost calculatorWhy Rhode Island prices differ
Statewide cost drivers here are freeze depth, bedrock and older housing stock. Locally, coastal and wetland setbacks drive design costs. That is why a mound system in Rhode Island can land well above or below the national range of $10,000–$22,000.
All system types in Rhode Island
| System | Low | High |
|---|---|---|
| Conventional | $4,500 | $10,200 |
| Chamber | $6,400 | $14,100 |
| Aerobic / ATU | $10,200 | $23,000 |
| Mound | $12,800 | $28,200 |
| Sand filter | $10,200 | $20,500 |
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.