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California Atty. Gen. Xavier Becerra filed a lawsuit Tuesday night against the Trump administration, alleging that the federal government violated the Clean Water Act by allowing, in recent years, millions of gallons of raw sewage, heavy metals and other contamination to routinely spill from Tijuana into San Diego.

Toxic water pollution from Mexico shuttered San Diego beaches located near the Tijuana River Valley on more than 500 days in the last three years, according to the complaint.

The lawsuit — which specifically targets the U.S. section of the International Boundary and Water Commission, or IBWC — paints a picture of a negligent and dismissive federal agency failing to follow through on its responsibility to address cross-border issues with Mexico.

“While the federal government has invested in other border issues, they haven’t invested in these water-quality issues,” said Dave Gibson, executive officer of the San Diego Regional Water Quality Control Board, which filed the lawsuit jointly with the state attorney general.

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