The S.C. Department of Health and Environmental Control is sampling sediment at Langley Pond as part of an assessment that will last a month or more.
Visitors to the area in Aiken County might notice a pontoon boat and other boats being used by technicians to gather samples for analysis, said Adam Myrick, a spokesman for the department.
The tests are designed to determine the extent of contaminants deposited on the bottom of the lake from industries that thrived along Horse Creek decades ago.
The sampling will not interrupt any activities in or around Langley Pond, Myrick said, and the department will schedule a community meeting this summer to share test results with residents.
The pond is popular among anglers and has rowing events have been held there. Concern over potential contamination dates back more than a decade.