San Diego County to build treatment plant for Tijuana River sewage pollution crisis

The river has carried millions of gallons of untreated sewage into San Diego’s South Bay region.

1 minute read

September 4, 2026, 7:00 AM PDT

By Zachary Whalen


Signs in English and Spanish warn of sewage contamination on hiking trail and beach near Tijuana River.

Signs in English and Spanish warn of sewage contamination on a hiking trail and beach near Tijuana River. | Simone Hogan

On Sept. 1, San Diego County supervisors voted to build a sewage treatment system in response to the Tijuana River pollution crisis. The river has carried millions of gallons of untreated sewage across the border, resulting in water quality concerns, health issues and over 1,300 consecutive days of beach closures for residents of San Diego's South Bay region.

There are already facilities on both sides of the U.S.-Mexico border intended to keep sewage out of the Tijuana River, but the systems do not capture all of the sewage and are unable to treat the polluted water flowing into the river. The new system will allow San Diego to treat the water before it reaches the coastline, Karen Weil writes for NBC San Diego.

The measure will allocate $1.8 million to the Department of Public Works to oversee the project's initial phase and turn the board's ad hoc subcommittee on the sewage crisis into a standing committee to oversee the project, NBC San Diego reports. The treatment system will be on the U.S. side of the border.

Wednesday, September 2, 2026 in NBC San Diego

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