Aerobic / ATU Septic System Cost in Delaware
Estimated 2026 installed range: $8,600 – $19,400
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Statewide cost drivers here are high water tables and clay soils. Locally, flat, wet lots frequently need mounded systems. That is why a aerobic / atu system in Delaware can land well above or below the national range of $8,000–$18,000.
All system types in Delaware
| System | Low | High |
|---|---|---|
| Conventional | $3,800 | $8,600 |
| Chamber | $5,400 | $11,900 |
| Aerobic / ATU | $8,600 | $19,400 |
| Mound | $10,800 | $23,800 |
| Sand filter | $8,600 | $17,300 |
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 Delaware · Aerobic / ATU system overview