Citizens of St. Charles County voted to approve the formation of St. Charles County Ambulance District on November 5, 1974 with a maximum authorized tax levy of $0.15 per $100 in assessed valuation.  In 2014, county residents approved Proposition E, an 11-cent tax levy increase.

The District began its first day of operation on December 30, 1975.   For a complete history of the District, click here.