A system for repelling mosquitoes near a spa (referred to herein as a “Zika Mist System” or “ZMS”) includes a string of misting devices interconnected in fluid communications for mounting on a spa tub structure in order to produce an insect-repelling, spa-water mist over the spa from chemically treated spa water taken from the spa. The ZMS includes a misting pump for delivering pressurized spa water from an outlet on the misting pump to the string of misting devices via an outlet line component of the ZMS; it also includes an input line for coupling an inlet of the misting pump in fluid communications with a water-holding portion of the spa (e.g., preferably doing so via a drain assembly on the spa). A mosquito-repelling spa includes a spa tub structure on which is mounted such a ZMS.