Tex. Water Code § 66.319

In addition to all other rights and remedies provided by law, if the district defaults in the payment of principal, interest, or redemption price on its bonds when due or if it fails to make payments into any fund or funds created in the orders or resolutions authorizing the issuance of the bonds or defaults in the observation or performance of any other covenants, conditions, or obligations set forth in the orders or resolutions authorizing the issuance of its bonds, the owners of any of the bonds are entitled to a writ of mandamus issued by a court of competent jurisdiction compelling and requiring the district and its officials to observe and perform the covenants, obligations, or conditions prescribed in the orders or resolutions authorizing the issuance of the district's bonds.