Williams County Environmental Data - Index to program areas, educational information, newsletters and events available through Ohio State University Extension. - http://williams.osu.edu/
Williams County Ground-Water Resources - Factsheet providing information on ground-water resources in the county. - http://ohioline.osu.edu/aex-fact/0490_86.html
Water Resources of Williams County - Factsheet providing information on water resources and drinking-water quality in the county. - http://ohioline.osu.edu/aex-fact/0480_86.html