North Florida’s main source of drinking water is the Floridan Aquifer, which is created by what is known as Karst topography.  Karst is characterized by sinkholes, caves, natural bridges, and springs.  It is formed over time from precipitation percolating through the porous limestone bedrock.  Surface waters often drain unfiltered to the aquifer through sinkholes (as is the case in the Santa Fe River), or travel through the extensive underwater cave systems in the limestone to resurface at springs along rivers and other bodies of water.  In this way, surface waters and litter, as well as other pollutants, are very much linked to the quality of our drinking water.