Related Rules and Regulations
Chapter 246-274 WAC - Greywater Reuse for Subsurface Irrigation
Chapter 51-56-1600 WAC - Washington State Plumbing Code - Gray Water Systems
Chapter 90.46 RCW - Reclaimed Water Use
Designing Greywater Systems
Tier One Greywater System Checklist and Irrigation Area Estimation Tool (PDF)
Tier Two and Three Greywater Subsurface Irrigation Systems Guidance (PDF)
Greywater & Water Conservation Information
Characteristics of Greywater, Summary of Literature (PDF)
Drought Information, Office of Drinking Water
Water Conserving On-site Wastewater Treatment Systems (PDF)
Water Use Efficiency, Office of Drinking Water
Information About Soils and Greywater
Low Impact Development Guidance, Department of Ecology
Information About Irrigation and Greywater
AgriMet - The Pacific Northwest Cooperative Agricultural Weather Network
Irrigation in the Pacific Northwest, WSU