The Pasco County Regional Water System’s primary water source is groundwater from several deep wells, located throughout Pasco County. The groundwater comes from porous, water-bearing underground geologic layers of sand, gravel, or rock that have the capability to produce water. These water-producing layers are called aquifers. The Alafia River, Hillsborough River, C.W. Bill Young Regional Reservoir, and the Tampa Bypass Canal are the primary sources for the regional surface water supply. Hillsborough Bay is the primary source of seawater for the regional desalinated supply.