Definition
The drain field is basically the ground's job in your septic system—treated wastewater percolates through soil to be naturally filtered. When it fails, you've got a problem that's both unpleasant and expensive.
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Find my pathAbout this term
Leach field (alternate term for drain field) disperses treated effluent for soil infiltration. Critical component of septic success. Soil conditions must support percolation. Groundwater depth affects design. System capacity depends on soil absorption. Failure impacts property value and livability. Inspection by septic contractors identifies problems. Repair costs range $5,000-15,000+. Regular pumping protects field. Proper installation and maintenance crucial. Alternative systems (sand filters, constructed wetlands) available if soil unsuitable.
Pro Tip
Have your soil tested before installing a septic system. A good leach field depends on the right soil conditions, and there's no fix for bad soil once the system is in.
Example
Leach field inspection identified slow percolation requiring field enlargement.