CHARLOTTE, N.C. (AP) - The lake that's the main water source for 2 of North Carolina's largest cities is too acidic for fish, but officials say it's still safe to drink.
State water regulators put part of Mountain Island Lake on North Carolina's list of "impaired" waters for the first time Wednesday. The lake supplies Charlotte and Gastonia.
Regulators don't know why the measurements show more acid, but acid rain caused by coal-burning power plants is a possibility.
A scientist with North Carolina State University, Viney Aneja, says the drought is more likely the problem. Aneja says low water in streams and lakes could have concentrated sulfate and nitrate and temporarily increased acid levels.