By SDCN Staff
San Diego, CA–Efforts to address longstanding pollution problems in the Tijuana River Valley received a significant boost this week with the launch of a new $46 million state grant program and the approval of a county infrastructure project aimed at reducing harmful gas emissions near the U.S.-Mexico border.
The California State Water Resources Control Board has opened applications for a $46 million grant program designed to improve water quality and reduce pollution in the Tijuana River Valley and the New River.
Both waterways have been heavily impacted by sewage, trash and other pollutants flowing across the border from Mexico into the United States, creating environmental concerns and public health risks for residents in South San Diego County and Imperial County.
The funding will support projects that reduce bacteria, solid waste, air emissions and other pollutants. Eligible projects may also focus on improving public health, restoring habitat and natural resources, or managing sediment in affected waterways.
State officials said at least one project from each river watershed will receive funding.
Planning grants of up to $750,000 are available, while construction grants can provide as much as $10 million per project, with some projects eligible for up to $20 million. The program is funded through Proposition 4, the climate and environmental bond measure approved by California voters in 2024.
Applications are being accepted through Aug. 31. The State Water Board will also host a webinar to assist prospective applicants with the application process.
In a separate development, the California Coastal Commission approved a San Diego County project that will temporarily extend two culvert pipes at the Saturn Boulevard crossing in an effort to reduce hydrogen sulfide emissions.
Currently, water exits the culverts approximately six feet above the riverbed, creating turbulence and splashing that increase the release of hydrogen sulfide gas, which is known for its strong “rotten egg” odor and potential health impacts.
Under the approved project, the culverts will be extended so that water is discharged below the surface, reducing turbulence and helping limit the release of pathogens and harmful gases into the air. The project also includes flow-control caps, anchors and riprap to stabilize the system.
County officials said the work will remain within previously disturbed areas to minimize impacts on sensitive habitat and wildlife.
The Coastal Commission approved the project on June 10 with conditions requiring protections for sensitive plant and animal species, measures to prevent water pollution during construction, and continued public access along Saturn Boulevard, which serves as part of the California Coastal Trail.
While officials acknowledge that significant challenges remain in addressing pollution in the Tijuana River Valley, the new grant funding and infrastructure improvements represent meaningful progress toward cleaner water and improved air quality for nearby communities.
Local leaders hope the investments will accelerate efforts to protect public health, restore environmental resources and advance long-term solutions to one of the region’s most persistent cross-border pollution problems.
