Aerobic / ATU Septic System Cost in Louisiana
Estimated 2026 installed range: $7,200 – $16,200
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Statewide cost drivers here are high water tables and clay soils. Locally, flood-prone lots often require mounds or elevated systems. That is why a aerobic / atu system in Louisiana can land well above or below the national range of $8,000–$18,000.
All system types in Louisiana
| 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.
Related pages
All septic costs in Louisiana · Aerobic / ATU system overview