If territory is added to the service area of a person owning a water system located in the authority, the territory becomes territory of the authority on the effective date of the territory's addition to the service area unless the added territory is included in another local government's approved groundwater reduction plan as of the effective date of the addition. The authority by rule may require the person to send the authority:
Tex. Spec. Dist. Loc. Laws § 8888.053