Mound Septic System Cost in Maine
Estimated 2026 installed range: $11,800 – $26,000
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Open the cost calculatorWhy Maine prices differ
Statewide cost drivers here are freeze depth, bedrock and older housing stock. Locally, shallow bedrock and frost depth are the two biggest cost drivers. That is why a mound system in Maine can land well above or below the national range of $10,000–$22,000.
All system types in Maine
| System | Low | High |
|---|---|---|
| Conventional | $4,100 | $9,400 |
| Chamber | $5,900 | $13,000 |
| Aerobic / ATU | $9,400 | $21,200 |
| Mound | $11,800 | $26,000 |
| Sand filter | $9,400 | $18,900 |
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.