Retests of drinking water at Mooresville’s Lake Norman High School found none of the chemical used in rocket propellant that had caused alarm last week, the school district said Thursday.
Iredell-Statesville Schools had supplied bottled water to the school after perchlorate, which can affect the thyroid, was found in water from one faucet.
Water from the suspect faucet was retested twice last week, and two additional faucets at the school were tested.
“The first reading at LNHS was really a puzzle to everyone,” Kenny Miller, assistant superintendent of facilities and planning, said in a statement Thursday.
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#ReadLocal No perchlorate had been detected in water samples taken at Lakeshore Elementary and Lakeshore Middle schools, which use the same water line that supplies Lake Norman High, Miller added.
It has asked its consultant, Reliant Environmental, how and where that could have occurred.
While long-term exposure to perchlorate causes cancer in lab rats, the Agency for Toxic Substances and Disease Registry says it’s not considered likely to do so in humans.
Iredell-Statesville Schools had decided to test water at its schools in part because of controversy over lead found in water at some Charlotte-Mecklenburg schools.
A toxicologist suggested that the tests include perchlorate, which would not normally be part of them, because of the thyroid cancer issue and because some states outside North Carolina regulate the chemical in water.