Water availability

Each year, the state’s water supply is dependent on rainfall, snowpack, and temperature.  Surface and groundwater availability varies by watershed and the sub-basins within those watersheds. Water availability also depends on the water rights held by property owners in each area.

If you have questions about water availability for a particular property, you’ll want to start by knowing your watershed, also known as a Water Resource Inventory Area or WRIA. You might also want to know some basics about Washington water law so you better understand how decisions about water use allocations are made.