California Proposes Stringent Cap On Toxic Chemical In Drinking Water

California regulators are proposing a strict limit on a toxic man-made chemical that has contaminated water supplies throughout the state, particularly in its vast agricultural heartland.

California would be only the second state, after Hawaii, to establish a threshold for the former pesticide ingredient and industrial solvent known as TCP (1,2,3-trichloropropane) in drinking water. The chemical compound, identified in California as a human carcinogen, is no longer in wide use but has leached over the years into many wells and reservoirs.