CHARLOTTE, N.C. (AP) — A report on the health of the nation's drinking water says a North Carolina's city water contains chemicals that could make consumers sick, a claim the city disputes.

The Charlotte Observer reports the Environmental Working Group released a report Wednesday that says trihalomethanes, the byproducts of chlorine disinfection, in Charlotte's water are within federal safety limits, but still pose health risks, citing city data from 2015.

The Centers for Disease Control and Prevention says large doses of TTHMs can cause liver damage and decreased nervous system activity.

Charlotte Water spokeswoman Jennifer Frost says the data is misleading, reflecting elevated levels traced to coal treatment at a Duke Energy power plant on Lake Norman.

Nneka Leiba with the Environmental Working Group says responsibility doesn't lie with water utilities, but rather with federal standards.

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Information from: The Charlotte Observer, http://www.charlotteobserver.com