Tex. Spec. Dist. Local Laws Code § 8503.028

Notwithstanding any other provision of this chapter, the authority may exercise all powers within Lampasas County that it may otherwise exercise within the 10 counties specified in Section 8503.003, except that the authority may not provide water or wastewater services in the portion of Lampasas County outside the Colorado River watershed without the consent of the Brazos River Authority.