Communities near the Tijuana River Valley may notice stronger sewage odors starting next week, as crews begin the second and final phase of connecting a new sewer line in Mexico.
The work, expected to begin May 13 and take about a week, will temporarily increase the flow of wastewater across the U.S.-Mexico border. This final stretch is critical for reducing the risk of major pipeline failures and improving the reliability of Tijuana’s aging sewage system.
Once completed, the new International Collector will carry untreated wastewater to both the South Bay International Wastewater Treatment Plant in San Diego and the San Antonio de los Buenos facility in Mexico. During construction, however, some of that wastewater may be rerouted directly into the ocean through an outfall just south of the border, potentially increasing pollution along South County beaches.
The U.S. International Boundary and Water Commission (USIBWC) is working closely with Mexican project managers to track progress and minimize spills. Bypass systems are in place to divert as much flow as possible to the U.S. treatment plant.
A joint effort between USIBWC, the U.S. Environmental Protection Agency, California Department of Public Health, San Diego Regional Water Quality Control Board, County of San Diego, and the local Air Pollution Control District has been coordinating responses to the long-running sewage crisis and sharing health updates with the public since early 2024.
How to reduce the impact of odors at home
Residents can take steps to minimize discomfort from hydrogen sulfide (H₂S) odors by:
Limiting outdoor activity when odors are strongest. Keeping windows and doors shut during odor events. Using fans or air conditioning set to “recirculate.” Running an air purifier equipped with a HEPA filter and potassium permanganate. (Free purifiers are available from the SDAPCD for residents in the most affected zip codes. Verified models are listed on the California Air Resources Board website.)People with asthma, COPD, or other lung conditions should keep rescue medications nearby. If symptoms worsen or persist, contact a healthcare provider.
The Air Pollution Control District continues to monitor odor complaints and hydrogen sulfide levels in areas near the river valley.
For ongoing updates, visit the County’s South Region Health Concerns webpage or explore the newly launched online dashboard, which features interactive maps with beach water quality and odor tracking.
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