Tex. Water Code § 60.079

Any justice court in the justice precinct in which an offense under this subchapter is alleged to have been committed or in any county court at law in the county where an offense is alleged to have been committed, which county court at law has concurrent original jurisdiction with the justice court, shall have original jurisdiction of any misdemeanor or violation under this subchapter and original jurisdiction of any violation of an ordinance, rule, or regulation made under this subchapter.