Cal Water held a ribbon-cutting ceremony to commemorate the completion of a chromium-6 (Cr-6) treatment plant in its Dixon District yesterday. Mayor Jack Batchelor and representatives from Senator Lois Wolk, Assemblymembers Bill Dodd and John Garamendi’s offices; Solano County Supervisor John Vasquez, among other local officials, were in attendance.
The treatment plant, one of three plants Cal Water has constructed in the past year, will reduce the amount of naturally occurring Cr-6 from the local water supply. In July 2014, the State of California set the country’s first regulation for Cr-6, allowing no more than 10 parts per billion (ppb) of the constituent be in water provided to consumers. Wells in Cal Water’s Dixon District had naturally occurring Cr-6 levels ranging from 15-24 ppb; however, since the treatment plants came online, the water supply in the Dixon District has remained in compliance with the new state standard.
In order to find the most effective solution, Cal Water’s Water Quality and Engineering departments experimented with three types of groundwater treatment options. After taking cost, method effectiveness, waste disposal, and raw water quality all into consideration, the team selected a strong base ion-exchange approach.
“We wanted to use an option that was both cost-effective for our customers and also effective in treating the water supply,” said Local Manager Jack Caldwell. “The treatment plants that we have installed will ensure Cal Water customers have access to a safe and reliable water supply around the clock.”
“We are one of the first companies in America to use the strong base ion-exchange to treat Cr-6, and it has worked even better than we could have expected,” said Water Quality Manager Rob Thompson. “We will share what we have learned in research and development to help the City of Dixon and smaller water utilities find effective treatment solutions for their systems.”