Aerobic / ATU Septic System Cost in Rhode Island
Estimated 2026 installed range: $10,200 – $23,000
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Statewide cost drivers here are freeze depth, bedrock and older housing stock. Locally, coastal and wetland setbacks drive design costs. That is why a aerobic / atu system in Rhode Island can land well above or below the national range of $8,000–$18,000.
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 aerobic / atu systems are for
Aerobic treatment units add oxygen to break down waste faster. They are used on tight or wet lots, require electricity, and need periodic maintenance.
Related pages
All septic costs in Rhode Island · Aerobic / ATU system overview