U.S., Mexico agree on steps to unravel decades-old Tijuana River sewage disaster

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San Diego — America and Mexico have signed an settlement outlining particular steps and a brand new timetable to wash up the longstanding drawback of the Tijuana River pouring sewage throughout the border and polluting California seashores, officers from each nations introduced Thursday.

Billions of gallons of sewage and poisonous chemical substances from Tijuana have polluted the Pacific Ocean off neighboring Southern California, closing seashores and sickening Navy SEALs who prepare within the water. That is regardless of a number of efforts and tens of millions of {dollars} which have been poured into addressing the issue over many years, together with below the primary Trump administration.

“There’s a nice dedication by the 2 nations to strengthen cooperation,” Mexico’s Environmental Secretary Alicia Bárcena stated Thursday after assembly with Environmental Safety Company Administrator Lee Zeldin in Mexico Metropolis for the signing of the memorandum of understanding.

Mexican Secretary of Atmosphere and Pure Sources Alicia Barcena Ibarra and U.S. Environmental Safety Company (EPA) Administrator Lee Zeldin signal a memorandum of understanding between U.S. and Mexico to realize a everlasting answer to the Tijuana River sewage difficulty, in Mexico Metropolis on July 24, 2025.

Raquel Cunha / REUTERS


The accord comes three months after Zeldin flew to San Diego to fulfill with Mexican officers and go to the border.

“I smelled what lots of residents locally lived by means of and need to take care of,” he stated Thursday. “I noticed the degradation of the Tijuana River valley. I heard in regards to the seashores that had been closed. I met with the Navy Seals, who’ve had their coaching impacted. It was a robust go to throughout for me.”

“The Trump Administration is proud to ship this huge environmental and nationwide safety win for Individuals within the San Diego space who’ve been dwelling with this disgusting uncooked sewage flowing into their communities for a lot too lengthy,” Zeldin stated, based on CBS San Diego affiliate KFMB-TV.

Mexico US Sewage

A pair stroll alongside the seashore as indicators warn of contaminated water Wednesday, Dec. 12, 2018, at Imperial Seashore, Calif. 

Gregory Bull / AP


Below the settlement, Mexico will full its allocation of $93 million towards infrastructure tasks, together with adhering to a selected schedule for precedence tasks spanning by means of 2027.

The 120-mile-long Tijuana River runs close to the coast in Mexico and crosses into Southern California, the place it flows by means of Navy-owned land and out to the Pacific.

As Tijuana’s wastewater remedy vegetation have aged, its inhabitants and trade — together with the manufacturing vegetation, often called maquiladoras that make U.S. items – have boomed. On the similar time, there was a rise within the quantity of poisons which have made their approach into the river and into San Diego County – since 2018, greater than 100 billion gallons of uncooked sewage laden with industrial chemical substances and trash.

The air pollution has sickened not solely swimmers, surfers and lifeguards but additionally schoolchildren, Border Patrol brokers and others who do not even go within the water. Scientists say the sewage is vaporized when it foams up and enters the air individuals breathe.

California seashores close to the border have been closed as a rule over the previous 4 years.

Since 2020, greater than $653 million in funds have been allotted to handle the problem, however the disaster has continued largely due to delays by the Mexican authorities, Zeldin has stated.

Zeldin stated this settlement components in “inhabitants development, operation and upkeep prices, and different variables that might make this answer sturdy and long run.”

He praised the brand new administration of Mexican President Claudia Sheinbaum, who took workplace final October, for its willingness to handle the problem.

Sheinbaum stated earlier Thursday that her authorities would broaden a wastewater remedy plant that would cut back the contamination reaching the coast.

“There are different actions that had been signed that we’ve got to finish, that we will get performed within the subsequent 12 months for your complete Tijuana sanitation system, for your complete metropolitan Tijuana space,” she stated.

Sheinbaum stated america additionally has to make investments within the binational drawback.

Referring to a different settlement to ship extra water to the U.S. to scale back Mexico’s water debt within the Rio Grande, Sheinbaum stated the Tijuana River settlement “is an efficient instance of how when our technical groups sit down, they’ll resolve an issue that appeared unsolvable.”

The U.S. has agreed to finish the growth of the South Bay Worldwide Wastewater Remedy Plant subsequent month. The settlement additionally stipulates that Mexico this 12 months divert 10 million gallons per day of handled sewage away from the shore.

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