(A) A special purpose district, which was empowered as of March 7, 1973, to provide water service to the area within its boundaries, may provide sewer service to the area within its boundaries if it has received permission, by written resolution, from the governing body of the county in which the district is located, provided that the sewer service may not be provided to those parts of that area where sewer service, at that time, is being provided by a governmental entity at the time the district’s governing body determines to utilize the provisions of this section. The district may build, acquire, construct, operate, and maintain sewage collection, treatment, and disposal facilities or contract for the use of any facilities as are, in the opinion of the governing body of the special purpose district, necessary for the district. The district may impose such schedule of rates and charges for the use of sewage collection, treatment, and disposal facilities as the governing body of the district shall from time to time approve. The governing body may place into effect and revise, whenever it wishes or is required, a schedule of rates for the sewer service made available by it to persons, firms, and corporations within the district.

(B) All other powers of a special purpose district shall continue and are not considered to be changed by the provisions of this section.