Election Code §42.031

(a) During March or April of each odd-numbered year, each commissioners court shall determine whether the county election precincts comply with Sections 42.005 , 42.006 , and 42.007 . The commissioners court may make that determination during March or April of an even-numbered year. Before May 1 of the year in which the determination is made, the commissioners court shall order the boundary changes necessary for compliance. (b) The commissioners court may order a boundary change only during March or April unless the change is necessary to: (1) comply with Section 42.005 or 42.032 ; (2) reduce the number of registered voters in a precinct so it does not exceed the maximum number permitted by Section 42.006 ; or (3) include within a precinct a suitable building available for use as a polling place if no suitable building is available for that purpose within the existing precinct boundary.