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Water in Maui is a precious resource. Our forested watersheds collect and store our rain and fog water in deep aquifers, allowing future use in residences, businesses while maintaining our stream resources.

The West Maui Mountains Watershed Partnership protects the source water that contributes more than 75% of the potable water for the Department of Water Supply on Maui.  In other words, the land we protect provides fresh clean water to communities not only on the West Side, but from Pa'ia and Ma'alaea all the way south to Makena.

Where does Maui water come from?

If you live in Upcountry Maui, your water is surface water from the streams in East Maui. It is treated and disinfected at one of three DWS water treatment facilities (Kamole, Pi'iholo or Olinda) before it is delivered to your home.

Customers in Haiku get their water from the Haiku or Kaupakalua wells and/or the Kamole WTF.

For Central Maui (Kahului, Wailuku, Waihe'e, Ma'alaea, Kihei and Pa'ia) your water is groundwater from the 'Iao Aquifer under the West Maui Mountains. That water is naturally filtered by lava rocks, disinfected and then sent to your home. A small amount of filtered surface water is added to the Central System at the 'Iao WTF.

Hana and Moloka'i also use groundwater.

Lahaina customers have a mix of surface and groundwater. The water treatment facilities for West Maui are located above Lahainaluna School and near the Kapalua Airport.*

There are also many other communities in West Maui, such as Honokahau, Kahakuloa, Launiupoko, Olowalu and Ukumehame, that have local or independent water systems, not reliant on the DWS systems; however, their water supply still originates from within the West Maui Watershed.

* Courtesy of County of Maui, Department of Water Supply []

For more information on how water is distributed throughout Maui, please visit the Maui County Department of Water Supply's Website at