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Marshalltown outbreak: local health officials report 34 cases, trace source toward cooling towers

Marshall County Board of Supervisors · September 12, 2025
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Summary

State and local health officials told the Marshall County Board of Supervisors they have linked 34 cases and one death to a single Legionnaires outbreak in Marshalltown, are testing about 10 cooling towers and have asked likely sites to disinfect while culture results are pending.

State and local public-health officials told the Marshall County Board of Supervisors on Sept. 10 that they have identified 34 cases and one death tied to a single Legionnaires outbreak centered in Marshalltown and are investigating industrial cooling towers as the most likely source.

"For Marshalltown so far, we found 34 cases and 1 death that we believe are tied into and associated with a single outbreak here in Marshalltown," said Matt Donahue, an internal medicine physician and state epidemiologist with Iowa HHS. Donahue said Legionella is a bacterium that multiplies in warm, man-made water systems and can be spread when contaminated water is aerosolized.

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