Water Authorities - As enacted, expands the areas served by the West Tennessee River Basin Authority to include Perry, Stewart, Houston, and Humphreys counties. - Amends TCA Title 64, Chapter 1, Part 11.

HB 220 expands the service area of the West Tennessee River Basin Authority to include Perry, Stewart, Houston, and Humphreys counties. The bill amends state code to replace specific river basin references with "authority service area" throughout the law, clarifying the expanded jurisdiction. Crucially, the authority may only provide technical assistance, engineering services, and project management support in the newly added counties - not full program implementation. This change affects county governments in the four new counties, which can choose to participate in authority programs through a majority vote of their legislative body. The bill updates all relevant legal references to reflect the expanded service area while maintaining the limited service scope for the new counties.