• Water Source - Honokohau Stream and Honolua 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 two primary sources of raw surface water. The two major sources are the Honokohau Stream and Honolua Ditch.
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.