EBMUD tested for PFOA and PFOS in 2013-2015. The results were non-detect, although analytical methods have improved and detection levels today are lower. Based on prior sampling, and the protected nature of our watershed, EBMUD is not required under existing Division of Drinking Water regulations to sample because EBMUD’s system is not high-risk.
Although not required, EBMUD is sampling source water and treated water in 2020 and 2021.
- EBMUD is using the most advanced analytical method available at the time of sampling (EPA method 537.1)
- This method will quantify 18 different PFAS
- EBMUD is sampling quarterly from raw waters and WTP effluents
- Very precise and detailed testing protocols are needed to detect concentrations at ppt (parts per trillion) levels and avoid sample contamination
In 2020, all results (all locations and all parameters) were below the state's Notification Levels. Some low concentrations of some PFAS compounds were detected. Additional sampling is being done during 2021.