Skip to main content
close

KingCounty.gov is an official government website. Here's how you knowexpand_moreexpand_less

account_balance

Official government websites use .gov

Website addresses ending in .gov belong to official government organizations in the United States.

lock

Secure .gov websites use HTTPS

A lock lock or https:// means you've safely connected to the .gov website. Only share sensitive information on official, secure websites.

Drinking water

Public Health – Seattle & King County aims to prevent disease and illness from drinking water. Public Health provides technical support and guidance for small public water systems and reviews applications for private water systems.


Short URL: kingcounty.gov/water

Permitting process

How to get approval for your water source when developing a property in King County.

Water quality

Education and resources on determining if your water is safe to drink.

Drinking water emergencies

How to maintain safe drinking water during emergencies.

Rules, regulations, and policies

The key policies that govern public and private water systems in King County.

Forms, applications, covenant templates, and resources

Relevant documents and educational materials.

Find out more about your water system

Resources to look up more information on your water system.

Types of water systems in King County

  • Public water system

    • A system serving more than one household or a commercial establishment (school, park, church, business, etc.)
  • Large public water systems (Group A)

    • Population greater than 25.
    • Serves 15 or more connections
    • In compliance with Chapter 246-290 WAC
  • Small public water systems (Group B)

  • Private individual wells

    • One well serving a single-family home
    • Placed on a lot five acres or bigger or a lot created prior to May 18, 1972
    • Necessary covenants
    • Demonstrated adequate water quality and quantity
expand_less