Requiring, by January 1, 2026, a county water and sewerage plan to include a plan to minimize inundation risks to existing on-site sewage disposal systems and limit the installation of new on-site sewage disposal systems in climate vulnerable areas; prohibiting the installation of an on-site sewage disposal system in a climate vulnerable area to service a newly constructed building, and prohibiting the replacement of an on-site sewage disposal system in a climate vulnerable area, unless certain conditions are met; etc.