The Biscayne Aquifer provides about 90 percent of South Florida's drinking water. That's about 8 billion gallons of water per day. But as the seas rise and the pressure of the salt water increases, our entire source of fresh water is increasingly at risk. The map below shows the appoximate inland extent of saltwater intrusion along South Florida's coast.

SOURCE: South Florida Water Management District, U.S. Geographical Survey.