Wastewater testing shows measles RNA at Chester plant; county reports no confirmed cases
Jun 18, 2026
Delaware County health staff reported measles RNA detected in two of five wastewater samples from the Chester treatment plant; officials emphasized that wastewater detection is not the same as a confirmed clinical case and no positive clinical tests have been reported in the county.
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Delaware County health officials told the board they received wastewater surveillance results showing measles RNA in two of five samples collected at the Chester treatment plant. Director Laura said the county is coordinating surveillance tied to large events and that "a component of that surveillance work that we're doing is wastewater surveillance," which produced detectable signals in samples taken June 9 and June 11.
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