The U.S. Environmental Protection Agency has denied a request to investigate the Tijuana River Valley for a superfund designation, a label issued to some of the most toxic places in the nation ...

The push to explore a potential Superfund designation for the Tijuana River Valley hit a snag Wednesday when the U.S. Environmental Protection Agency told San Diego County leaders that the federal ...

Thursday's testing results released by EPA found levels at 70,000 nanograms per kilogram, more than 2,000 times the recommended level of 30 ng/kg, according to an EPA press release.

On Oct. 8, Lawson-Remer announced she would pursue a federal Superfund designation for the Tijuana River Valley, after supervisors voted to 3-2 to have county leaders present options for cleaning ...

The EPA's letter denied Aguirre's request to Zeldin, in which she asked him to reconsider designating the Tijuana River Valley as a superfund site. “This is a public health ticking time bomb.