USIBWC and EPA launch fast-track expansion to address Tijuana River pollution

USIBWC and EPA speed up the expansion of the SBIWTP from 25 to 35 MGD, aiming for a 100-day completion to reduce polluted river flows and odors.

May 21, 2025

On the US border fence to Mexico at El Paso

The United States International Boundary and Water Commission (USIBWC) and the U.S. Environmental Protection Agency (EPA) announced on May 20, 2025, the acceleration of the incremental expansion of the South Bay International Wastewater Treatment Plant (SBIWTP) from 25 to 35 MGD.

Originally planned to take two years, this expansion is now on track for completion in just 100 days, according to a USIBWC press release. This strategy should deliver immediate benefits by reducing polluted reiver flows and addressing odors that have been a concern.

Both agencies will continue working to achieve a 100% solution to the sewage crisis.

Wastewater Treatment

USIBWC investigates transboundary wastewater flow into U.S.

Wastewater mixed with stormwater began entering the United States from Tijuana.

Boulders on the Tijuana River National Estuarine Research Reserve in the morning light in San Diego, California.

Utility Management

EPA Administrator addresses Tijuana River sewage crisis in San Diego

EPA Administrator Lee Zeldin holds press conference in San Diego on Tijuana River sewage crisis, discusses collaboration with Mexican counterpart and impacts on community.