Mound Septic System Cost in North Carolina
Estimated 2026 installed range: $9,800 – $21,600
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Open the cost calculatorWhy North Carolina prices differ
Statewide cost drivers here are high water tables and clay soils. Locally, soil wetness classes determine system type and drain field size. That is why a mound system in North Carolina can land well above or below the national range of $10,000–$22,000.
All system types in North Carolina
| System | Low | High |
|---|---|---|
| Conventional | $3,400 | $7,800 |
| Chamber | $4,900 | $10,800 |
| Aerobic / ATU | $7,800 | $17,600 |
| Mound | $9,800 | $21,600 |
| Sand filter | $7,800 | $15,700 |
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.