County supervisor Nora Vargas said the county is the first local government to get U.S. Environmental Protection Agency approval to use the new sophisticated tests.
“The Tijuana River Valley pollution directly impacts the families of not only Imperial Beach but the community and the region as a whole,” Vargas said. “This advancement in water testing today is going to allow us to better monitor quality and provide us and the community with faster and more accurate information.”
The old tests relied on culturing water samples in a county lab for 18 to 24 hours. If bacteria grew in those cultures, local officials would know the water was not safe for humans. The new test takes a different approach. The Digital Drop Polymer Chain Reaction test searches for bacteria DNA in samples — if officials find that genetic material, the water is unsafe. That test can be performed in four to six hours.
“If we can get those results back in, the same day as opposed to the next day, that means … potentially that people can go back into the water after a beach closure, more quickly,” said Wilma Wooten, San Diego County Public Health Officer.
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