San Diego, CA
Pollution from the Tijuana river affects air quality in San Diego, finds study
 
																								
												
												
											 
The 120-mile Tijuana River flows from Baja California into the United States and discharges millions of gallons of wastewater—including sewage, industrial waste and runoff—into the Pacific Ocean every day, making it the dominant source of coastal pollution in the region.
Wastewater pollution has been an ongoing problem for decades and is so severe that the nonprofit environmental group American Rivers recently named the Tijuana River America’s second most endangered river.
A new study from the University of California San Diego examines how pollutants in wastewater travel and are transmitted in the atmosphere through coastal aerosols.
In the study, researchers found that a mixture of illicit drugs, drug metabolites, and chemicals from tires and personal care products aerosolize from wastewater and are detectable in both air and water. The results appear in Science Advances.
The paper’s lead author, Adam Cooper, collected samples from the air and water at various points along the coast of San Diego County, including the U.S.-Mexico border, Imperial Beach and the Scripps Institution of Oceanography in La Jolla.
Cooper, who graduated last spring with a doctorate in chemistry, was a member of Assistant Professor of Chemistry and Biochemistry Jonathan Slade’s group, and collected the samples as part of a field study with Distinguished Professor of Atmospheric Chemistry Kimberly Prather’s lab.
Prather, who holds a joint appointment at Scripps Oceanography and the Department of Chemistry and Biochemistry at UC San Diego, had been studying the air pollution impacts of the Tijuana River for several years. Cooper was able to join her team’s comprehensive sampling campaign across multiple sites from January to March of 2020.
Even though the samples were taken in 2020, the findings are still relevant because little has changed in how sewage released from the river is processed. In fact, pollution from the river has been an ongoing problem for more than 50 years.
“The Tijuana River region is a very dynamic environment with implications for public health, environmental policy and international relations between the United States and Mexico,” stated Cooper.
“Ours is one of the most comprehensive studies to date investigating water-to-air transfer of these pollutants.” The study looked at two aspects of wastewater pollution: the source and the concentration of pollutants along the San Diego County coastline.
To determine the origin of the pollutants, Slade’s lab used a compound they knew came from sewage: benzoylecgonine (BZG), a stable metabolite of cocaine, primarily produced when people use cocaine and then excrete it in urine.
They found that after rainfall, BZG levels in Imperial Beach ocean water spiked in correlation with increased Tijuana River flows, while BZG levels in aerosols spiked in correlation with enhanced sea spray aerosol emissions.
Correlating 11 other pollutants to BZG in aerosols allowed the team to determine which ones behaved similarly in the environment and likely originated from the same wastewater source. The results showed a high correlation between BZG; methamphetamine; octinoxate, a UV filter used in sunscreen; and dibenzylamine, a compound used in tire manufacturing.
The second part of the study measured pollutant concentrations along the coastline in the water and air. Overwhelmingly, they found that these pollutants were higher in the Tijuana River water than in the ocean, and higher in the water and aerosols in the Imperial Beach region than in La Jolla.
Although the amounts of some pollutants, like cocaine, were minuscule, others were more prominent, like octinoxate, which can break down into more toxic components.
In some cases, the octinoxate levels were comparable to measurements made directly above wastewater treatment plant vats, meaning that in some ambient conditions at the coast, the concentrations of pollutants that people are inhaling can be comparable to a worker at a wastewater treatment plant.
“It’s been shown that octinoxate can degrade DNA when exposed to light,” stated Slade. “And if it’s in these tiny aerosols we’re breathing in, it can get deep into our lungs and pass into our bloodstream. That’s very concerning, especially considering the high levels at which we found it in the air.”
The study shows that the closer you are to the Tijuana River, the more likely you are to be exposed to the pollutants it carries, even though the amounts are still relatively small—on the scale of tens of nanograms per hour. This may not seem like much if your exposure is limited to a few hours, but residents living close to the border are inhaling these chemicals over years, even decades.
Many residents have complained of respiratory illness, insomnia and headaches, and several San Diego beaches have been closed almost continuously for the last three years because of high levels of bacteria from wastewater runoff.
Although the paper doesn’t draw any conclusions about the detrimental effects on the environment or human health, Slade and Cooper emphasize the need for more research, better infrastructure and cross-border collaboration.
“Often the sewage crisis is considered a water issue—and it is—but we show that it’s in the air too. Truthfully, we don’t yet know the acute health effects,” stated Slade. “But the numbers we report can be incorporated into models to help us better understand what we’re breathing in and how much we’re exposed to.”
Cooper was so influenced by his work at UC San Diego that he is now a Science and Policy Technology Fellow with the California Council on Science and Technology, working with State Senator Ben Allen.
“The solutions to the cross-border sewage crisis aren’t constrained by technical challenges,” stated Cooper. “They’re constrained by political challenges and policy issues. We have to motivate decision-makers to make the right investments.”
In addition to better infrastructure, more public awareness is crucial to improving the region’s water and air quality, including understanding the downstream effects of the products we use, such as sunscreens and tires.
“Although our study focuses on the Tijuana River, there are other notable sources of wastewater and pollution run-off in Southern California, including wastewater treatment outfalls, the San Diego River and the Los Angeles River,” said Slade, who also noted that “turbulence in rivers and streams may aerosolize wastewater, requiring further study.”
Coastal port environments are extremely dynamic and complex, but these pollution issues are not relegated just to the San Diego-Tijuana region. They pose a global hazard.
An estimated 80% of all global wastewater is untreated. Of the portion that is treated, many plants remove bacteria, but not chemical pollutants. These chemicals remain in the water, which is released into rivers, lakes and oceans, traveling around the world through waterways and in the atmosphere.
“The global surge of untreated wastewater entering lakes, rivers and oceans poses a growing health threat. Aerosolization of this polluted water exposes billions of people through airborne transmission, reaching far beyond those in direct contact and impacting countless others who inhale contaminated air that can travel for many miles,” stated Prather.
“We are continuing our studies in this region to better understand the short and long-term health impacts of inhaling this newly identified source of airborne pollution.”
More information:
												Adam Cooper et al, Identifying Wastewater Chemicals in Coastal Aerosols, Science Advances (2025). DOI: 10.1126/sciadv.ads9476. www.science.org/doi/10.1126/sciadv.ads9476
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												Pollution from the Tijuana river affects air quality in San Diego, finds study (2025, May 28)
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																															San Diego, CA
City Staff Spent $6 million More on Rentals Without Council Approval. Councilmembers Want Answers
 
														 
A year ago, San Diego city auditors found that staff spent millions more on rental equipment for city departments than what councilmembers approved. But the auditors couldn’t find who OK’d the additional spending.
Over the last month, councilmembers have demanded answers from city staff after an audit found that a contract with Herc Rentals increased by more than $6 million without approval from the City Council.
“I had asked on the dais on Oct. 6 where the $6 million had come from that was taken from the general fund and increased unlawfully to the Herc rental contract,” Councilmember Marni von Wilpert said during an Oct. 20 City Council meeting. “I’m still waiting for an answer.”
The city has a contract with Herc Rentals to rent trucks, forklifts and other equipment and services. This equipment is used by city workers across several departments responsible for park maintenance, public safety and more.
For fiscal year 2020, councilmembers approved spending up to $14.3 million on rentals. The contract now allows spending up to $65.5 million.
City law requires the City Council to review and approve certain changes to city contracts. The Council is required to approve new contracts over $3 million and all adjustments to contracts over $200,000.
The city auditor found that didn’t happen in 2023. That year, staff adjusted the Herc Rentals contract in October by $4 million and then again in December by $2.7 million. Other adjustments made to the contract were approved by the Council.
The city auditor’s team said departments didn’t know whether their contracts needed Council approval.
In a statement, Ombretta Di Dio, spokesperson for purchasing and contracting, said the contract was adjusted “to pay outstanding invoices and allow departments access to rental equipment and vehicles to address operational needs, with the intent of obtaining retroactive approval.”
She said rental equipment and vehicles supported critical operations to the city. When some city vehicles were out for repair or missing parts, they used Herc rentals to help in emergency situations like the 2024 floods.
The city auditor gave Voice of San Diego the list of every transaction with Herc Rentals from 2019 to 2024. The transactions are from dozens of departments like public utilities, homelessness strategies and solutions, and transportation.
Di Dio said departments have “flexibility within their approved budget to manage non-personnel costs… When overages occur in one area, they are typically offset by savings in another—ensuring that operations continue without disruption.”
According to the 2024 audit, “when contract alterations are brought to Council late, it puts pressure on Council’s approval responsibility. As a result, Council’s ability to provide meaningful oversight may be reduced if there is not time to consider other vendors without disrupting critical services.”
In other words, when contracts are brought late to the City Council it limits their role and authority to make sound decisions on the contracts. Think of it like making charges to a shared credit card. Each department is charging to the credit card, unaware of how much other departments are spending on it too. Then, Council has to deal with the bill.
Say a department spent more than $50,000 on rental vehicles. They have a better chance of getting that approved by Council if they bring it late, because, well, they have already spent it and now they owe Herc.
So, Council might feel pressure to approve the action to adjust the contract so they can ensure Herc gets paid. But they don’t know if the departments have that money budgeted, they just know they owe Herc.
Councilmembers either vote no – and risk interrupting services – or vote yes and continue to meet the demands for rental equipment across departments.
The Herc contract is an example of these pressures. The Council recently approved an additional eighth amendment to increase the amount in July. The Council voted to increase the contract with the condition that they want to see a specific audit on it.
“I think one of the things I struggle with sometimes is who will bear the consequences if these contracts aren’t approved,” said Councilmember Sean Elo-Rivera during the Council meeting on Oct. 6.
“I think this is what puts us in a particularly difficult position as councilmembers… it is typically rank and file everyday employees who are doing the work.”
It’s unclear why the city is spending so much with Herc. A spokesperson with the city said the transportation department received a mid-year adjustment in FY25 to account for increased needs so that other departments’ needs were not reduced.
The city auditor is planning to do an individual audit on the Herc contract and any other vehicle contracts.
“We will begin the audit in the near future,” said City Auditor Andy Hanau.
Claudia Abarca, director of purchasing and contracting, said they implemented eight recommendations of the 13 made by the city auditor in the last year. One of these recommendations includes updating the Council approval threshold and clarifying alterations for goods and services contracts.
Still, councilmembers are frustrated and looking for answers.
“Do you realize we had a budget fight this past year for over $4.5 million in which the mayor vetoed it and we overrode the veto?” said Councilmember Von Wilpert during the Council Meeting on Oct. 6.
“Somebody had to use a city computer and make that adjustment unlawfully. It’s against the municipal code to do that, so who did that?”
Councilmember Raul Campillo also chimed in to ask if the city disciplined the employees who made the illegal adjustments. Abarca said they did.
“I’m really hopeful that’s what happened here, because this wasn’t a few dollars over,” said Councilmember Campillo. “This was several million dollars over.”
Abarca said that city departments were behind on payments and in a deficit of what they owed Herc. She said her staff was directed to make the unauthorized adjustments when they ran it up the chain of command.
“I don’t know that it went to the mayor himself, I know I did bring this up to the DCOO (deputy chief operating officer) and we’ve been working on this contract for quite some time,” said Abarca. “We’ve done several refinements on how we are monitoring and actually managing the spend for each department to ensure we don’t get to this place again.”
Abarca added they have not altered any contracts above $200,000 without it coming forward to the City Council since 2023.
It’s still unclear who is directly responsible for the contract changes, and where each department pulled money from their budget to pay Herc.
San Diego, CA
Opinion: The jury is in — Cabrillo was a Spaniard
 
														 
Sept. 28 was the 483rd anniversary of the arrival of the Spanish explorer Juan Rodriguez Cabrillo aboard the San Salvador at what we now call San Diego Bay. The San Salvador was the first European sailing vessel to reach the California coast.
Cabrillo National Monument was established in 1913 by President Woodrow Wilson. The Cabrillo/Spanish connection was prevalent in the original plans for Cabrillo National Monument, which were formulated in 1913.
Twenty years later, a fabricated shift began that asserted Cabrillo was Portuguese. The first reference to Cabrillo being Portuguese, as it relates to the Cabrillo National Monument, occurred in 1934. The first mention of the name João Rodrigues Cabrilho — note the different spelling of the final name — did not appear until 1935 and has never been verified as authentic.
The iconic statue at Cabrillo National Monument was commissioned by the Portuguese Secretariat of National Propaganda in 1939. Two bronze plaques displayed at the monument referring to Cabrillo as a Portuguese navigator were gifted by the Portuguese Navy in 1957 and 1988. The addition of the statue and plaques was not approved by Congress nor the director of the National Park Service, as required by federal statute.
In 2015, renowned Canadian historian and expert on 16th century Central America, Wendy Kramer, Ph.D., while conducting archival research, discovered several thousand pages of manuscripts with legal documents written by official scribes. Numerous documents were signed by Juan Rodriguez Cabrillo stating that he was a native of the Spanish village of Palma de Micer Gilio, now known as Palma del Río, Córdoba, Spain. Kramer was researching information about Guatemala in the 1520s and 1530s. Her findings were published in 2016 in The Journal of San Diego History.
Kramer’s paper — “Juan Rodriguez Cabrillo, Citizen of Guatemala and Native of Palma del Rio: New Sources from the Sixteenth Century” — was peer reviewed by several historians including Carla Rahn Phillips, professor emeritus at the University of Minnesota, and Harry Kelsey, the former chief curator of history at the National History Museum of Los Angeles County and research scholar at the Huntington Library.
Robert Munson, former Cabrillo National Monument historian, verified and agreed with the historians’ peer review. Local historians Iris Engstrand and Molly McLain, then co-editors of “The Journal of San Diego History,” agreed with Kramer’s conclusion.
An April 25, 2018, letter from Cabrillo National Monument Superintendent Andrea Compton to the House of Spain acknowledged and accepted Kramer’s finding that Cabrillo was born in current-day Palma del Río, Córdoba, Spain.
Despite overwhelming evidence and scholarly acceptance, the Cabrillo National Monument refuses to affirm that Cabrillo was of Spanish birth. In fact, after Kramer’s findings, the Cabrillo National Monument inexplicably changed the birthplace of Cabrillo on its website from Spain to “the Iberian Peninsula.”
Why does the National Park Service promote the inaccurate history that Cabrillo may have been born in Portugal? Even Portugal did not recognize Cabrillo as a native on the famous Monument of the Discoveries (Padrão dos Descobrimentos) in Lisbon.
Why does the National Park Service refuse to update the information it disseminates to the public on its website, wayside exhibit and brochures? Why does it reference the name João Rodrigues Cabrilho when that person does not exist in the history of California? This name is a fake created by the government of Portugal and the Portuguese in California. Read the history of California.
The House of Spain in San Diego’s YouTube channel shows a short video about the Cabrillo National Monument history.
Where is any similar historical research and peer review acceptance of the Portuguese claims? Answer: There is none.
Latin American history experts with whom I have consulted unanimously agree Cabrillo was Spanish. They unanimously agree there is no reliable evidence supporting the position that Cabrillo was Portuguese.
The National Park Service needs to be honest in telling the story of Cabrillo. Give all visitors the objective truth.
Benayas is president of House of Spain in San Diego and lives in San Diego.
San Diego, CA
Add Nick Hundley, Ruben Niebla to list of Padres’ managerial finalists
 
														 
The Padres have narrowed their managerial search to no more than four finalists and expect to make a decision on who will replace the retired Mike Shildt by the end of the week.
Pitching coach Ruben Niebla, former Padres catcher and current Rangers advisor Nick Hundley and future Hall of Famer Albert Pujols are finalists for the position, according to sources. It is not certain they are the only remaining candidates.
The Padres have not commented on the manager search.
It was already known that Pujols met with Padres officials Tuesday in San Diego. Niebla was seen during his interview at Petco Park on Monday, and sources confirmed he and Hundley are in the running. Hundley could not be reached for comment, and Niebla did not answer a phone call seeking comment.
Albert Pujols interviews for second time as Padres narrow managerial search
The three finalists and bench coach Brian Esposito (and possibly others) participated in interviews via Zoom last week in the first round of interviews. The second round of interviews is being held in person.
Niebla has essentially remade the Padres pitching program since taking over as pitching coach in October 2021, and the team has perennially ranked among the league leaders in that span. The Calexico High graduate pitched in the minor leagues in the Expos and Dodgers organization and coached in the Guardians organization from 2001 through 2020.
Hundley played in the major leagues for 12 seasons, the first 6½ of them (2008-14) with the Padres. He spent time working for MLB after his retirement in 2019 and has been a special assistant in the Rangers’ baseball operations department since 2022. Hundley lives in San Diego.
Pujols, whose 704 home runs are fourth most in major league history, has never coached or managed in the minor or major leagues. His managerial experience is limited to leading Leones de Escogido to the Dominican Winter League and Caribbean Series titles in 2025.
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