Tex. Water Code § 30.032
A contract or group of contracts may provide for the district to render services concurrently to more than one person through constructing and operating a disposal system and may provide that the cost of these services be allocated among the persons as provided in the contract or group of contracts.
Amended by Acts 1977, 65th Leg., p. 2207, ch. 870, Sec. 1, eff. Sept. 1, 1977.