Aerobic / ATU Septic System Cost in California
Estimated 2026 installed range: $11,600 – $26,100
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Statewide cost drivers here are hard ground, terrain and remote access. Locally, strict regional water board permits and high labor rates drive costs up. That is why a aerobic / atu system in California can land well above or below the national range of $8,000–$18,000.
All system types in California
| System | Low | High |
|---|---|---|
| Conventional | $5,100 | $11,600 |
| Chamber | $7,200 | $16,000 |
| Aerobic / ATU | $11,600 | $26,100 |
| Mound | $14,500 | $31,900 |
| Sand filter | $11,600 | $23,200 |
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 California · Aerobic / ATU system overview