(a) Subject to the availability of funds, the department may provide essential public health services for a population for which a municipality, county, public health district, or other political subdivision is not receiving a grant to provide those services under Section 121.0065.
(b) Subject to the availability of funds, the department shall develop a plan that complies with Section 121.0065(d) to evaluate the effectiveness, accessibility, and quality of essential public health services provided under this section.