Aerobic / ATU Septic System Cost in District of Columbia
Estimated 2026 installed range: $10,000 – $22,500
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Statewide cost drivers here are high water tables and clay soils. Locally, urban lots require engineered designs and tight permits. That is why a aerobic / atu system in District of Columbia can land well above or below the national range of $8,000–$18,000.
All system types in District of Columbia
| System | Low | High |
|---|---|---|
| Conventional | $4,400 | $10,000 |
| Chamber | $6,200 | $13,800 |
| Aerobic / ATU | $10,000 | $22,500 |
| Mound | $12,500 | $27,500 |
| Sand filter | $10,000 | $20,000 |
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 District of Columbia · Aerobic / ATU system overview