California's Water Resources Control Board Division of Drinking Water (DDW) lowered its response level guidelines for perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS).
The California Water Resources Control Board Division of Drinking Water (DDW) lowered its response levels to 10 parts per trillion (ppt) for perfluorooctanoic acid (PFOA) and 40 parts per trillion (ppt) for perfluorooctanesulfonic acid (PFOS).
After earlier sampling, Santa Clarita Valley Water Agency (SCV) removed one groundwater well from service because it exceeded the prior response level in May 2019.
The remaining wells tested well below that level, however, according to KHTS Radio. DDW is also slated to issue a new compliance sampling order in the near future. The revised response level guidelines will be compared to a quarterly running annual average of sample results.
Under these new guidelines, as many as 18 of the 44 wells could be impacted. New operating strategies and proven treatment options will be enacted to mitigate the issue, reported KHTS Radio.
The first per- and polyfluoroalkyl substances (PFAS) treatment facility began construction and is expected to be in operation by June 2020. This will restore three key wells to service and the project is estimated to cost $6 million to build and $600,000 annually to operate, reported KHTS Radio.
SCV Water will also expedite design and construction of new groundwater treatment facilities at additional wells impacted.
“We are committed to clear and timely communication with our customers about all water quality changes and how we plan to address them,” said Matt Stone, general manager of SCV WaterStone. “Our customers are our top priority, and we are committed to rigorously testing our water thousands of times per year to ensure it meets or surpasses all water-quality standards and is safe for our customers to drink.”