§ 562. Laboratory supply stations; expenses. The actual and necessary expenses of operation and maintenance of the district laboratory supply station and sub-stations shall be paid in the manner prescribed for the payment of other bills of the municipality or county. All such sums shall be a charge upon the municipality, when a single municipality is included in a district, and, upon the county when more than one municipality is included, to be paid from amounts appropriated by the municipality or county for laboratory services or general public health purposes.