Aerobic / ATU Septic System Cost in Massachusetts
Estimated 2026 installed range: $10,600 – $23,800
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Open the cost calculatorWhy Massachusetts prices differ
Statewide cost drivers here are freeze depth, bedrock and older housing stock. Locally, Title 5 requires engineering design in many towns. That is why a aerobic / atu system in Massachusetts can land well above or below the national range of $8,000–$18,000.
All system types in Massachusetts
| System | Low | High |
|---|---|---|
| Conventional | $4,600 | $10,600 |
| Chamber | $6,600 | $14,500 |
| Aerobic / ATU | $10,600 | $23,800 |
| Mound | $13,200 | $29,000 |
| Sand filter | $10,600 | $21,100 |
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 Massachusetts · Aerobic / ATU system overview