Tex. Water Code § 56.292

At a regular meeting of the board, any resident freehold taxpayer of the district may present a petition signed by at least five percent of the qualified voters of the district, or if there are fewer than 100 resident freehold taxpayers in the district, then by one-third of the resident freehold taxpayers requesting the dissolution of the district, and on verification of the petition signatures, the board shall order an election to be held in the district at the earliest legal time to determine whether or not the district should be dissolved.