Mound Septic System Cost in Connecticut
Estimated 2026 installed range: $13,000 – $28,600
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Open the cost calculatorWhy Connecticut prices differ
Statewide cost drivers here are freeze depth, bedrock and older housing stock. Locally, older homes often need full replacement plus Title V compliance upgrades. That is why a mound system in Connecticut can land well above or below the national range of $10,000–$22,000.
All system types in Connecticut
| System | Low | High |
|---|---|---|
| Conventional | $4,600 | $10,400 |
| Chamber | $6,500 | $14,300 |
| Aerobic / ATU | $10,400 | $23,400 |
| Mound | $13,000 | $28,600 |
| Sand filter | $10,400 | $20,800 |
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.