iStock/Elenathewise(CNN) - Chemical contaminants were detected in water sources serving more than 7 million Californians, according to a new report by the Environmental Working Group.
The nonprofit, which describes itself as "dedicated to protecting human health and the environment," found that water sources for 74 community water systems -- serving 7.5 million people in California -- have been contaminated with PFAS chemicals.
The EPA issues drinking water advisories when PFAS levels are at or above 70 parts per trillion.
Earlier this month, Denmark became the first country to ban PFAS chemicals.
Gavin Newsom signed a law, to go into effect in 2020, allowing the state board to order public water systems to monitor for PFAS chemicals, and requiring community water systems to report detections.