• Water Source - Honokohau Ditch
  • Service Area - Lahaina, Napili, Wahikuli, Kahana, Alaeloa
  • Design by - Austin Tsutsumi & Associates and Camp Dresser & McKee
  • Construction by - Bodell Wheelwright Construction
About the Facility
The Mahinahina Water Treatment Facility (WTF) is located near the Kapalua airport and draws from three primary sources of raw surface water. The two major sources are the Honokohau and the Honolua Streams. The other water source is the Kanaha Stream.

Mahinahina utilizes pre-sedimentation to treat raw surface water. Rapid mix, flocculation, and direct filtration with a mixed media filter are used. After this process, chlorine is added for disinfection.
Mahinahina Water Treatment Facility

The approximate cost of the construction of this facility was $18 million. Mahinahina's average daily production is 2.4 million gallons per day.