Mound Septic System Cost in District of Columbia
Estimated 2026 installed range: $12,500 – $27,500
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Open the cost calculatorWhy District of Columbia prices differ
Statewide cost drivers here are high water tables and clay soils. Locally, urban lots require engineered designs and tight permits. That is why a mound system in District of Columbia can land well above or below the national range of $10,000–$22,000.
All system types in District of Columbia
| System | Low | High |
|---|---|---|
| Conventional | $4,400 | $10,000 |
| Chamber | $6,200 | $13,800 |
| Aerobic / ATU | $10,000 | $22,500 |
| Mound | $12,500 | $27,500 |
| Sand filter | $10,000 | $20,000 |
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.
Related pages
All septic costs in District of Columbia · Mound system overview