| Education / Resources |
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| Seattle's Regional Water System - Virtual Map |
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Seattle's Regional Water System
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Explore Seattle's Water System Map >
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Click on names, places, and icons to learn how water gets to your neighborhood.
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- Take tours of the Cedar and Tolt watersheds
- Find out more about your local water providers
- Explore the Map Legend
- See inside the Water Quality Lab
- Learn what happens to our water at the Lake Youngs facility and much more!
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Click on the map to open and get started!
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Seattle's Regional Water System serves over 1.3 million people including customers in the City of Seattle and 22 other water providers. These water providers, also called purveyors, typically have their own storage and distribution systems.
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Two watershed sources provide the majority of water for the system. About 70% is provided by the Cedar River Watershed. The remaining 30% comes from the Tolt River Watershed (29%) and wells at the Highline Wellfield (1%). From these sources, water travels by large pipelines to neighborhood storage areas and then on to home, business and institutional users where it is monitored and measured by water meters. Water is cleaned, treated and continually tested as it travels through the system to ensure that it is of the highest quality.
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Water demand varies, depending on seasonal weather conditions. Summer and early fall months are typically times when the greatest amount of water is used, primarily for irrigation. The system provides an average of 160 million gallons per day (MGD) for the region.
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Water Cycle
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Learn more about the Earth's water cycle.
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Water Mains
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Learn more about water mains
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Water Meters
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Find out how to measure the amount of water we use. Learn more about water meters
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Household Water
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How does water get into your house? Learn about household water
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