Haw. Rev. Stat. § 88F-12
A county may enter into a formal agreement with the State to extend the State's deferred compensation retirement plan and its provisions to part-time, temporary, and seasonal or casual employees of the county or establish a deferred compensation retirement plan independently in accordance with sections 457 and 3121 of the Internal Revenue Code of 1986, as amended, for their respective part-time, temporary, and seasonal or casual employees. A plan so established under this section need not be subject to the other provisions of this chapter, but shall be in compliance with applicable federal laws and regulations. A plan established by a county under this section shall be the sole responsibility of and administered by that county. The board shall not be responsible or liable for any county plan established under this section.
HRS § 88F-12