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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
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Public water system
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A system serving more than one household or a commercial establishment (school, park, church, business, etc.)
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Large public water systems (Group A)
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Population greater than 25.
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Serves 15 or more connections
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In compliance with Chapter 246-290 WAC
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Small public water systems (Group B)
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Serves 2-14 connections.
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Population less than 25.
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In compliance with Chapter 246-291 WAC
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Private individual wells
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One well serving a single-family home
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Placed on a lot five acres or bigger or a lot created prior to May 18, 1972
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Necessary covenants
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Demonstrated adequate water quality and quantity
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