CHARLOTTE, NC - Duke Energy is in the process of removing coal ash from Riverbend Steam Station.
Three weeks ago, they started draining the coal ash pond and have been pumping that water into Mountain Island Lake.
The lake provides Charlotte with a majority of its drinking water.
The idea is to clear out the water so the coal ash at the bottom of the pond can be removed.
"I know that people have concerns about the water quality of Mountain Island Lake. We understand that's a very important water source for the city of Charlotte,” said Zenica Chatman, Duke Energy Spokesperson.
While the process is going on, Duke Energy officials and county officials are keeping a close eye on the water quality.
They’re looking for things like metals and pH levels changing in the lake. So far, county officials haven’t detected any issues.
"The water quality at Mountain Island Lake is extremely good. We want to keep it that way,” said Rusty Rozzelle, Mecklenburg County Water Program Manager.
Duke Energy has until 2019 to clear out the coal ash pond.
The county will continue to monitor the water quality beyond that point.