Engineers plan to inspect the City of Hagerstown's Smithsburg reservoir, which has been leaking for about two weeks, officials said.
The reservoir is not a source of drinking water for the city's roughly 75,000 water customers, said Dave Shindle, water department engineer.
The dirty water filtered out during the treatment process at the William M. Breichner Water Treatment Plant goes into the Smithsburg reservoir, Shindle said.
The reservoir south of Smithsburg can hold 20 million gallons.
The water is leaking underground through a crack and will reach nearby streams, Shindle said.
Water department officials prefer the water to have time to settle before it reaches the streams, so the streams don't become too muddy, Shindle said.