Mound Septic System Cost in New Hampshire
Estimated 2026 installed range: $12,200 – $26,800
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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 mound system in New Hampshire can land well above or below the national range of $10,000–$22,000.
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 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.