The team has created a Drinking Water Tool that allows Californians to find out where their drinking water comes from and map groundwater contamination with arsenic, nitrate, hexavalent chromium and 1,2,3-Trichloropropane. Screenshots of the tool show levels of arsenic contamination in Sacramento and Yuba City community water systems (left) and community water systems and domestic wells combined (right). (Maps generated by the Community Water Center Drinking Water Tool; UC Berkeley image by Kara Manke)