Saltwater has infiltrated a Louisiana parish's drinking supply as drought slows the Mississippi River. It could put residents with health issues at risk

About 3,000 residents in a Louisiana community south of New Orleans have been warned saltwater permeated their drinking water supply, posing a threat to residents with health risks.

source https://www.cnn.com/2022/11/03/us/louisiana-plaquemines-parish-drinking-water-advisory/index.html