Aerobic / ATU Septic System Cost in New Hampshire
Estimated 2026 installed range: $9,800 – $22,000
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Statewide cost drivers here are freeze depth, bedrock and older housing stock. Locally, bedrock and slope are the dominant cost factors. That is why a aerobic / atu system in New Hampshire can land well above or below the national range of $8,000–$18,000.
All system types in New Hampshire
| System | Low | High |
|---|---|---|
| Conventional | $4,300 | $9,800 |
| Chamber | $6,100 | $13,400 |
| Aerobic / ATU | $9,800 | $22,000 |
| Mound | $12,200 | $26,800 |
| Sand filter | $9,800 | $19,500 |
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 New Hampshire · Aerobic / ATU system overview