Salt water intrusion inland is worse than you think, including the “Apalachicola salinity feature” up to the GA-FL line and east through Lowndes County, with a special additional brackish Valdosta feature. Central north Florida is an island of fresh groundwater surrounded by entire saline Florida coast around from Alabama plus across to Brunswick, GA, then again from Savannah up past Charleston. South of Lakeland, FL the map is all red for saline.

Figure 53. Estimated altitude of the 10,000-milligrams-per-liter (mg/L) total dissolved solids boundary, southeastern United States.

Apparently using the data preliminarily mapped earlier in the Florida Well Salinity Study, geologists from three states connected the dots in Revised Hydrogeologic Framework of the Floridan Aquifer System in Florida and Parts of Georgia, Alabama, and South Carolina, By Continue reading →