Mound Septic System Cost in South Carolina
Estimated 2026 installed range: $9,200 – $20,200
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Open the cost calculatorWhy South Carolina prices differ
Statewide cost drivers here are high water tables and clay soils. Locally, coastal properties often require raised systems. That is why a mound system in South Carolina can land well above or below the national range of $10,000–$22,000.
All system types in South Carolina
| System | Low | High |
|---|---|---|
| Conventional | $3,200 | $7,400 |
| Chamber | $4,600 | $10,100 |
| Aerobic / ATU | $7,400 | $16,600 |
| Mound | $9,200 | $20,200 |
| Sand filter | $7,400 | $14,700 |
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.