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A statewide standard for a cancer-causing contaminant in drinking water is being proposed in California. If passed, Hexavalent Chromium would have to be below 10 parts per billion for drinking wells throughout the Golden State. The contaminant is both naturally occurring and is used by industries involved with heavy metal work. Water suppliers say the proposed standard for Hexavalent Chromium would increase monthly rates for many residents. The highest levels reported today are in parts of Ventura, Los Angeles, Yolo, Merced and Riverside counties. Community wells measured in Sonoma County have an average concentration of 15.9 parts per billion.