Aerobic / ATU Septic System Cost in Indiana
Estimated 2026 installed range: $7,200 – $16,200
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Statewide cost drivers here are clay soils and deep frost. Locally, seasonal high water tables can force a raised system. That is why a aerobic / atu system in Indiana can land well above or below the national range of $8,000–$18,000.
All system types in Indiana
| System | Low | High |
|---|---|---|
| Conventional | $3,200 | $7,200 |
| Chamber | $4,500 | $9,900 |
| Aerobic / ATU | $7,200 | $16,200 |
| Mound | $9,000 | $19,800 |
| Sand filter | $7,200 | $14,400 |
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.