Arsenic http://www.epa.gov/OGWDW/arsenic.html

Barium http://www.epa.gov/OGWDW/dwh/c-ioc/barium.html

Cadmium http://www.epa.gov/OGWDW/dwh/c-ioc/cadmium.html

Chromium http://www.epa.gov/OGWDW/dwh/c-ioc/chromium.html

Lead Fact Sheet: http://www.epa.gov/OGWDW/dwh/c-ioc/lead.html

How to Reduce Lead: http://www.epa.gov/safewater/lead/lead1.html

Mercury
http://www.epa.gov/OGWDW/dwh/c-ioc/mercury.html

Selenium
http://www.epa.gov/OGWDW/dwh/c-ioc/selenium.html

Silver
http://www.epa.gov/OGWDW/hfacts.html

Sodium & Chloride http://www.epa.com

Fluoride

Nitrate
http://www.epa.gov/OGWDW/dwh/c-ioc/nitrates.html

Coliform Bacteria (required for a Building Permit) http://www.epa.gov/OGWDW/hfacts.html#Microbiological

Secondary Contaminants: (not required for a building permit)

Soil Fumigants:

1,2 DCP http://www.epa.gov/OGWDW/dwh/c-voc/12-dich3.html

Other Contaminants:
http://www.epa.gov/OGWDW/hfacts.html