Figure 5. Cross-sectional view of the water table aquifer on St. George Island, Florida. Contours of silicate (green), total phosphorus (red), and total nitrogen (blue) concentrations indicate the movement of wastewater from an onsite treatment and disposal system (OSTDS) toward surface waters (Apalachicola Bay). Although there are current restrictions for the setback distance of OSTDS, natural groundwater movement may transport excess nutrients and other contaminants to surface waters.
Credit: Florida Sea Grant