Much of the Everglades are less than three feet above sea level. The rising sea may submerge the low-lying portions. Moreover, as sea level rises, salt water can mix farther inland or upstream into the Everglades, which allows salt-tolerant species like mangroves to spread inland but threatens cypress swamps and other species that do not tolerate salt water. Increasing salinity may also threaten the Biscayne Aquifer, which is the primary source of drinking water for South Florida. The aquifer is recharged by surface water in the Everglades, so saltier water in the Everglades would reach the aquifer as well. The city of Hallandale Beach has abandoned six of its eight drinking water wells, because the water was becoming too salty to drink.
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