An underground storage area to allow liquids from primary treatment or graywater to soak into the ground.  Typically a soil covered, stone filled pit with perforated distribution pipes.

Treatment Level:  Secondary
Relative Cost:
Amount of Maintenance Interaction:  low
Beneficial Byproduct:  none



Operation & Maintenance

Additional Notes:

  • Best to keep stormwater drainage directed away from the drainf ield as much as possible.
  • Important not to compact the field with heavy equipment or impervious surfaces.

Drain Field Distribution System (

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