Aerobic / ATU Septic System Cost in Colorado
Estimated 2026 installed range: $9,200 – $20,700
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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 aerobic / atu system in Colorado can land well above or below the national range of $8,000–$18,000.
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 aerobic / atu systems are for
Aerobic treatment units add oxygen to break down waste faster. They are used on tight or wet lots, require electricity, and need periodic maintenance.
Related pages
All septic costs in Colorado · Aerobic / ATU system overview