Warning Signs Installed in Parts of Tijuana River Valley

New warning signs were posted today alerting the public about the health risks from hydrogen sulfide gas in sections of the Tijuana River Valley Regional Park, and at Saturn Boulevard in the city of San Diego.

The County of San Diego partnered with the City on the installation of the signs on their respective properties after reviewing the results from two CDC health surveys in the community. Residents in the area reported having lingering health symptoms including headaches and nausea related to Tijuana River sewage.

The signs include a QR code that takes people to a County website dedicated to health and environmental concerns in the area. The website also explains County efforts in the Tijuana River Valley and directs people to the Air Pollution Control District website for a free air purifier.

The Tijuana River has long carried untreated sewage across the U.S.-Mexico border. The contaminated water has created an ongoing environmental and public health crisis.

The new warning signs serve to inform the public while local, state, and federal partners continue to push for long-term pollution control solutions.

By Anita Lightfoot | August 20, 2025 | County of San Diego Communications Office

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