Mound Septic System Cost in Colorado
Estimated 2026 installed range: $11,500 – $25,300
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Open the cost calculatorWhy Colorado prices differ
Statewide cost drivers here are hard ground, terrain and remote access. Locally, mountain terrain and freeze depth affect tank depth and insulation. That is why a mound system in Colorado can land well above or below the national range of $10,000–$22,000.
All system types in Colorado
| System | Low | High |
|---|---|---|
| Conventional | $4,000 | $9,200 |
| Chamber | $5,800 | $12,600 |
| Aerobic / ATU | $9,200 | $20,700 |
| Mound | $11,500 | $25,300 |
| Sand filter | $9,200 | $18,400 |
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.