Aerobic / ATU Septic System Cost in Wisconsin
Estimated 2026 installed range: $7,800 – $17,600
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Statewide cost drivers here are clay soils and deep frost. Locally, sandy soils are common, but frost depth affects installation. That is why a aerobic / atu system in Wisconsin can land well above or below the national range of $8,000–$18,000.
All system types in Wisconsin
| System | Low | High |
|---|---|---|
| Conventional | $3,400 | $7,800 |
| Chamber | $4,900 | $10,800 |
| Aerobic / ATU | $7,800 | $17,600 |
| Mound | $9,800 | $21,600 |
| Sand filter | $7,800 | $15,700 |
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 Wisconsin · Aerobic / ATU system overview