WATER RESOURCES
Oʻahu's Water
Learn more about our fresh water, from an introduction into the state's water cycle to background into Oʻahu's watersheds and Oʻahu's municipal water history.
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Oʻahu's Watersheds
A watershed is a diverse and highly organized ecosystem which specializes in the capturing of rain and atmospheric moisture from the air and sky. They are usually located in high mountains or valleys, which then divert the water into rivers and streams. Watersheds are composed of several layers of dense vegetation. Oʻahu's watershed can also be described as a Hawaiian rain forest, which captures and saves large amounts of water.
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Hawaiʻi's Water Cycle
Hawaiʻi's fresh water supply is intimately dependent upon a continuous chain of events called the water cycle. The atmosphere, ocean, and land – as well as the sun and other elements of environment – are linked to replenish this island's fresh water supply. A healthy water cycle is essential. Without it, no fresh water would be available and no living things, including humans, could survive on our islands.
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Oʻahu's Water History
Learn more about the history of Oʻahu's water, from ancient Hawaiian times through the creation of the Board of Water Supply in 1929 to today.
Updated: 01/30/2025