A Charlotte Water official demonstates a tool that uses sound waves to detect sewer line blockages.
A Charlotte Water official demonstates a tool that uses sound waves to detect sewer line blockages. David T. Foster III dtfoster@charlotteobserver.com
A Charlotte Water official demonstates a tool that uses sound waves to detect sewer line blockages. David T. Foster III dtfoster@charlotteobserver.com

Charlotte sewage spills hit 30-year low

August 27, 2015 11:29 AM