Jefferson County Seal
Jefferson County,
Est. 1818
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The Jefferson County Homeland Security Emergency Response Team (HSERT) provides hazardous materials response support to public safety agencies in Jefferson County and across the St. Louis Metro Area.  Staffed entirely by volunteers, the HSERT is composed of highly trained personnel with backgrounds in both public safety and private industry.



Chief Officers:



Jason Wisdom


Assistant Chief

Mike Siegel


Deputy Chief

Don Ridenhower