Greywater Recycling for Gardens — FarmPal

Redirect sink, shower, and laundry water to irrigate trees and gardens. A family of four produces 40-80 gallons of greywater daily enough to irrigate 500-1,000 sq ft of garden or orchard year-round.

Principles

  • Greywater = all household water except toilet (that's blackwater)
  • Laundry-to-landscape is the simplest and most effective system
  • Greywater should go directly into soil never store it or let it pool
  • Use biocompatible soaps (no boron, sodium, or chlorine)
  • Mulch basins around trees receive and filter greywater
  • Check local regulations legality varies by jurisdiction

Action steps

  1. Start with laundry-to-landscape

    Redirect washing machine drain hose to an outdoor distribution system. No permit needed in many states. Use 1" polyethylene tubing with branched outlets to mulch basins around fruit trees.

  2. Switch to biocompatible products

    Use plant-friendly soaps: Oasis, Sal Suds, or homemade. Avoid bleach, boron-containing detergents, and antibacterial products.

  3. Build mulch basins

    Dig shallow basins (12-18" deep, 3-4 ft diameter) around trees. Fill with wood chip mulch. Greywater enters basin, filters through mulch, irrigates tree roots.

  4. Expand to shower and sink

    Add branched drain systems from bathroom sinks and showers. Three-way diverter valves allow switching between greywater system and sewer for maintenance.

Benefits

  • Saves 30-50% of household water usage
  • Free irrigation for trees and gardens
  • Reduces septic/sewer load
  • Nutrients in greywater feed plants
  • Resilience during drought or water restrictions

Further reading

  • The New Create an Oasis with Greywater Art Ludwig
  • Greywater Action (greywateraction.org)
  • Local building department for regulations