(a) The Baldwin County Commission is authorized to regulate the minimum size of lots located or to be located in subdivisions of land situated outside the corporate limits of any municipality in the county and is authorized to regulate the planning and construction of all public streets, public roads, and drainage structures located or to be located in subdivisions of land situated outside the corporate limits of any municipality in the county, including the power to require the filing and posting of a reasonable surety bond with the county commission by the developers of such subdivisions to guarantee the actual construction and installation of approved proposed public streets, public roads, and drainage structures before the sale or offering for sale of any lots from such subdivision to the public. The county commission may require the developers of all proposed subdivisions of lands situated outside the corporate limits of any municipality in the county to submit the plat of such proposed subdivision to the county commission for approval before such plat is filed for record in the office of the judge of probate.
(b)(1) If any such public street, public road, or drainage structure is erected, constructed, or maintained in violation of this section or any regulations made pursuant thereto, the county may institute appropriate action or proceedings to prevent such unlawful erection, construction, or maintenance, or to require such erection, construction, or maintenance to conform to the regulations prescribed therefor.
(2) Notwithstanding any authority otherwise conferred by this section, after June 15, 1973, once a subdivision has been approved in accordance with the subdivision regulations applicable to the subdivision at the time of approval, the county commission shall have no authority to impose, by amendment to any subdivision regulations, zoning regulations, or otherwise, any new or additional front, side, rear, or wetland setback requirements on any lot contained within a previously approved subdivision which would increase the setback requirements or impose a more restrictive setback requirement on the use of the lot.