Levels of Disinfectant Byproducts, or DBPs, in Bloomington's water dropped in July after months of increased efforts to lower the contaminants.
DBPs are a result of the water decontamination process. Exposure to high levels over a long period of time can be detrimental to health.
Earlier this year, Bloomington's DBP levels came close to exceeding the limits set by the Environmental Protection Agency, spurring city officials to test the water more often and implement changes to the cleaning process.
Summer heat tends to increase DBP levels, so the elevation between January and July was expected.
"We are happy to have numbers to report that are a decline from June, despite a hot July," said Bloomington Mayor John Hamilton in a statement. "Of course we will test water quality monthly while we continue to modify and improve our water treatment practices."