Chamber Septic System Cost in New Hampshire
Estimated 2026 installed range: $6,100 – $13,400
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Open the cost calculatorWhy New Hampshire prices differ
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 chamber system in New Hampshire can land well above or below the national range of $5,000–$11,000.
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 chamber systems are for
Chamber systems replace gravel with plastic chambers. They are lighter, faster to install and work well on sites where gravel delivery is expensive.