Tijuana River Cleanup Funding Left Uncertain After USMCA Renewal Stalls

Federal efforts to address the decades-long Tijuana River sewage and pollution crisis have been thrown into uncertainty after the Trump administration declined earlier this month to renew the United States-Mexico-Canada Agreement, triggering an annual review process and leaving San Diego officials without clarity on how future cleanup funding will be secured.

The Tijuana River Valley has for decades received flows of untreated sewage, industrial waste and stormwater runoff originating south of the border, closing South Bay beaches for extended stretches and releasing hydrogen sulfide gas that residents and public health researchers have linked to respiratory and other health impacts. The river was named among the ten most endangered in the country in 2024 and identified as the second most polluted river in America in 2025. Past federal responses have included the 2020 USMCA’s roughly $300 million allocation to the Border Water Infrastructure Program, the binational Minute 328 agreement in 2022 committing close to $474 million toward infrastructure upgrades, and Minute 333 in 2025, which added operations and maintenance planning on top of that construction funding.

With the trade pact’s renewal now uncertain, local elected officials and environmental groups gathered in Otay Mesa in mid-July to press negotiators to attach binding, enforceable pollution commitments to whatever agreement eventually replaces or extends USMCA. San Diego County Supervisor Paloma Aguirre, whose district includes the Tijuana River Valley, told reporters the region cannot keep operating under vague promises while residents continue to suffer the health consequences of the crisis. Assemblymember David Alvarez has said he plans to introduce a state resolution next month demanding stronger, measurable commitments on the river as part of any renegotiated trade deal, echoing a similar measure state Senator Steve Padilla introduced earlier this year urging Congress and the administration to withhold any USMCA extension until Mexico agrees to concrete steps to end the chronic sewage discharges.

The advocacy coalition behind the push includes Sierra Club San Diego, the surf-focused environmental group WILDCOAST, Surfrider Foundation, Four Walls International and the Tijuana River Coalition, several of whose representatives joined officials at a separate news conference in July at the John J. Montgomery Memorial Wing calling for the same binding language. Advocates argue that despite hundreds of millions of dollars in cumulative federal investment over the past several years, on-the-ground pollution levels have not meaningfully improved, and that hydrogen sulfide exposure has begun reaching inside residents’ homes rather than remaining an outdoor nuisance.

State officials have moved to backfill some of the funding gap independent of the federal question. Governor Gavin Newsom announced $46 million in state money in June to help address cross-border contamination, though local leaders and advocates describe that sum as a stopgap rather than a substitute for the far larger federal and binational commitments needed to complete outstanding infrastructure work. EPA Administrator Lee Zeldin has attributed the crisis’s persistence in part to delays on the Mexican government’s side of outstanding infrastructure obligations, a characterization Mexican officials have disputed as trade talks continue.

Some progress has come through binational agreements reached outside the broader trade negotiation. A 2025 agreement between the U.S. and Mexican governments committed both countries to accelerating infrastructure timelines under Minute 328, including completion of Mexican-side projects by the end of 2027, in some cases years ahead of the original schedule, and expansion of the South Bay International Wastewater Treatment Plant’s treatment capacity from 25 to 35 million gallons per day. Whether those commitments hold, however, is now entangled with the same uncertainty surrounding the broader trade relationship, since much of the U.S. funding tied to the plant’s rehabilitation has been contingent on Mexico meeting its own obligations first.

The stakes for South Bay communities are difficult to overstate. Beach closures tied to sewage contamination have affected Imperial Beach and other coastal areas for years, with economic consequences for tourism and recreation alongside the direct public health toll. Because the Tijuana River crisis has become entangled with a broader and higher-profile trade dispute involving tariffs, automotive and agricultural provisions, and other elements of the U.S.-Mexico-Canada relationship, San Diego’s environmental and public health concerns risk being negotiated as a secondary priority within a much larger economic negotiation.

Talks over the future of USMCA are continuing, and the coming weeks are expected to determine whether the current trade review becomes the vehicle San Diego officials are hoping for to lock in enforceable commitments, or whether the Tijuana River crisis remains, as it has for decades, dependent on incremental agreements that advocates say have consistently under-delivered relative to the scale of the problem.

By Navarro Report Staff

Human-Directed AI Journalism: This piece was researched and directed by a human journalist, with AI tools assisting in drafting under editorial supervision. All facts have been reviewed for accuracy prior to publicat