Contact the Hendry County Extension Office. Hendry County's Extension Office is partnered with the University of Florida and can be reached at: 863-674-4092. Ask a county employee about the water tables.
Phone the South Florida Water Management District. The district, called "Swift Mud" by locals, keeps records about water tables for Hendry County and all of south Florida. It also monitors water usage and availability, and estimates future consumption and use. Contact SFWMD by phoning 561-686-8800 or 800-432-2045.
Contact the U.S. Geological Survey. The USGS studies the natural resources of the country, including water tables. Log on to the USGS website and click on "Contact USGS" in the upper right corner of the website.