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Posted on: February 7, 2020

State Lowers Response Threshold for PFAS Chemicals

At this time, Rancho Water’s drinking water system is not impacted by the updated response levels.  

Rancho Water continues to meet or exceed all local, state and federal water quality standards, including the updated standards relating to PFOA and PFOS.

“Rancho is committed to ensuring safe, reliable drinking water for each of its 150,000 customers,” said General Manager Jeff Armstrong. “When our customers turn on their tap, they can feel confident in the quality of their water.”

Still used today and known collectively as PFAS, this group of chemicals are resistant to heat, water and oil. For decades, they have been used in many industrial applications and consumer products such as carpeting, waterproof clothing, upholstery, food paper wrappings, fire-fighting foams, and metal plating.

Based on research cited by the California State Water Resources Control Board, most people are exposed to PFAS through food – via food packaging, farming processes, or bioaccumulation (gradual chemical buildup). Over time, PFAS also have accumulated in land near airports, industrial sites, military bases, and landfills. Once PFAS leach into the land, the chemicals can, in some cases, seep into groundwater.

New advanced detection science means that traces of PFOA and PFOS are being regulated by parts per trillion, which is about four grains of sugar in an Olympic-size swimming pool or one pinch of salt in ten tons of potato chips. As new and more advanced detection technologies uncover extremely low concentrations of chemicals, Rancho will continue to closely monitor the quality of the community’s drinking water supplies.

To learn more about PFAS, visit For more information about Rancho’s water quality, visit

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