(This measure has not been amended since it was reported to the Senate on March 9, 2004. The summary of that version is repeated here.)
Hawaii Water Resources Act of 2004 - Amends the Reclamation Wastewater and Groundwater Study and Facilities Act to authorize the Secretary of the Interior to participate in the design, planning, and construction of: (1) a project in Kalaeloa, Hawaii, to desalinate and distribute seawater for direct potable use within the service area of the Board of Water Supply, City and County of Honolulu, Hawaii; (2) facilities in Kealakehe, Hawaii, for the treatment and distribution of recycled water and for environmental purposes within the County of Hawaii; and (3) facilities in Lahaina, Hawaii, for the distribution of recycled water from the Lahaina Wastewater Reclamation Facility for non-potable uses within the County of Maui (authorizes the Secretary to acquire land for such facilities). Limits the Federal share to 25 percent of the total cost of any such project. Prohibits the use of funds provided by the Secretary for project operation and maintenance. Authorizes appropriations.