Most customers of the Carmichaels Municipal Authority no longer have to boil their tap water before drinking it.
The authority lifted the boil water advisory on April 21 for most of its 1,700 customers, but those on Stephenson’s Lane, Browns Ferry Road, Nemacolin Road and in Stringtown should continue boiling water until further notice, the authority said.
The notice distributed by the authority says the problem that led to the advisory, which was issued April 8, has been corrected.
Since then, the authority has disinfected its water treatment plant and flushed its water lines.
A water buffalo was set up for customers at the Carmichaels-Cumberland Township Fire Department before an interconnection with a neighboring water system operated by the Western Pennsylvania Water Authority in Jefferson was installed.
Authority officials said a compound known as trihalomethane was found at the plant during an inspection and the compound might have seeped through the plant’s filters.
Trihalomehtane is a byproduct of the reaction between chlorine, the the plant uses to disinfect water, and bromide, which is in the Monongahela River, the authority’s water source.
Authority officials said the bromide is coming from Marcellus shale gas drilling waste water.
The state Department of Environmental Protection has said bromide can come from several sources, but has asked water treatment plants, which can accept, but can’t fully treat Marcellus waste water, to stop accepting it in order to reduce the amount of bromide in waterways.