National Institute for Occupational Safety and Health
http://www.cdc.gov/niosh/homepage.html
Phone 1-800-35-NIOSH

Centers for Disease Control and Prevention
http://www.cdc.gov/
Phone 1-800-311-3435

Environmental Protection Agency
http://www.epa.gov/

healthfinder
http://www.healthfinder.gov/
healthfinder® has been recognized as a key resource for finding the best government and nonprofit health and human services information on the Internet. healthfinder® links to carefully selected information and Web sites from over 1,800 health-related organizations.

Food and Drug Administration
http://www.fda.gov/
Home page for the the consumer protection agency for food and drugs.

State Land Grant University Servers
http://www.cas.psu.edu/docs/coext/regions/southeast/cumberland/NACAA/OtherLinks.html
Phone (217) 876-1220
If you're looking for a agriculture safety contact in a specific county, this link will probably yield the best results.