This water tastes a little salty

Climate change will, can, and does raise global sea levels, but even a few inches or a foot in coming decades are not nearly as big a problem for water supplies on the heavily populated coasts as the people living there.  Pulling the groundwater out of the ground allows the nearby ocean water to flow into the spaces previously occupied by the salt water, and that makes the water pretty much upotable and undrinkable.   This is a good argument for reuse, conservation, and maybe not living so close to the coast, but that's just the liberal socialist government control freak in me talking.

Coastal drinking water more vulnerable to water use than climate change