What it means
An aerobic treatment unit pumps air into a treatment chamber so aerobic bacteria digest organic waste more thoroughly than in a standard anaerobic tank. The result is clearer effluent with fewer solids and pathogens.
ATUs include blowers, diffusers, and often an alarm when airflow or power fails. They are a type of advanced treatment used when site conditions limit a basic drain field.
Why it matters in Santa Cruz County
In Santa Cruz County hillside and coastal parcels, ATUs appear on engineered designs where room for a large leach field is limited or where regulators want extra treatment before effluent reaches sandy or fractured soils near the Monterey Bay.
Homeowner tip
Listen for the blower running normally and never cover vents or electrical panels that service the unit.
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Also explore the Plumbing Glossary or call 831.225.4344 with questions about your property.