Aerobic / ATU Septic System Cost in Mississippi
Estimated 2026 installed range: $6,800 – $15,300
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Statewide cost drivers here are high water tables and clay soils. Locally, high water tables are common; aerobic systems are frequently used. That is why a aerobic / atu system in Mississippi can land well above or below the national range of $8,000–$18,000.
All system types in Mississippi
| System | Low | High |
|---|---|---|
| Conventional | $3,000 | $6,800 |
| Chamber | $4,200 | $9,400 |
| Aerobic / ATU | $6,800 | $15,300 |
| Mound | $8,500 | $18,700 |
| Sand filter | $6,800 | $13,600 |
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 Mississippi · Aerobic / ATU system overview