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- Over 100 billion gallons of raw sewage have entered the U.S. from the Tijuana River over decades.
- Water tests show E. coli, arsenic, and bacteria that resist antibiotics in coastal waters.
- Up to 75% of Navy SEALs’ training may be canceled because of water pollution.
- Border communities say illnesses of the lungs, skin are up.
- Sea animals and fishing along the Pacific coast are in danger.
When you consider US national security threats, you might think of spies, missiles, or cyberattacks—but sewage? It’s hard to believe, but yes. The worsening pollution coming across the border from Tijuana River sewage that is not treated now creates dangers that go far beyond just the environment. It puts troop readiness, public health, and regional stability at risk, and it shows how US-Mexico cooperation on environmental issues is getting worse. Over five million gallons of raw Mexican wastewater flood into Southern California each day. Experts, lawmakers, and people who live there warn that this growing crisis needs fast, joined-up action. 
The Facts: How Much is Being Dumped
The Tijuana River has been polluting across borders since the 1930s. But in recent decades, the pollution has gotten much worse. Broken systems, fast growth of cities, and slow government action have made the problem worse. The river has become a toxic pipe spilling right into the United States.
The International Boundary and Water Commission (IBWC) says that more than 100 billion gallons of raw sewage from Mexico have gone into the U.S. through the Tijuana River over the past several decades. It’s upsetting that over 5 million gallons are now being sent into the river system every day. This waste flows into the U.S. through southern San Diego County. It crosses the border through the Tijuana River Valley before going into the Pacific Ocean.
This isn’t just a local problem. The pollution spreads. Ocean currents push it across beaches in Imperial Beach, Coronado, and even north toward more populated beach cities. This makes it a bigger problem for the environment and public health.
What’s in the Water? The Bad Stuff and What it Does
Polluted water from the Tijuana River doesn’t just smell bad or look dirty—it’s dangerous because of chemicals and living things in it. Many tests of water quality have shown that what flows across the border has high amounts of
- E. coli: A bacteria from poop that causes stomach problems and infections.
- Bacteria that resist antibiotics: A growing health problem around the world because they are harder to treat with normal medicines.
- Heavy metals: Including arsenic, which is poisonous even if you are exposed to a little bit.
- Volatile organic compounds (VOCs): Factory chemicals that are bad for both air and water.
The waste also carries chemicals from factories, leftover medicines, and trash, which makes the problem worse. These poisons harm both water and air, especially when they turn into vapor or when it rains. These events send bad things into the air.
Most scary of all, germs that resist antibiotics hurt hospitals and make it harder to treat people. These “superbugs” can infect people if they get into small cuts or even if they breathe them in. This makes the Tijuana River a place where sickness grows, and it could cause the next big public health problems.
Health Crisis at the Border: Communities in Danger
In coastal cities like Imperial Beach, San Diego, and Coronado, people are in a public health crisis and don’t have much protection. Beaches are often closed because the water is not safe. But this doesn’t do much to protect people who live there from breathing in bad air or from the ongoing harm of living near a poisonous river.
County health numbers show that virus infections, skin problems, and lung issues are up in communities closest to the polluted coast. In some cases, healthcare workers say they are seeing infections that used to be rare much more often, especially in children and older people—mainly those living near the border.
Supervisor Jim Desmond has talked about pets that have needed to see a doctor because they were in contact with polluted areas for a long time. Winds carry chemical-filled air miles inland. So even people who never go in the water are getting sick. Schools and homes just a few miles from the coast might be exposed every day without knowing it.
Troops Affected: Sewage & Military Readiness
One of the most worrying results of the Tijuana River sewage crisis is that it is increasingly harming U.S. military readiness. The Naval Amphibious Base Coronado, where Navy SEALs live and train, is right next to the polluted waters. These special forces need the nearby ocean areas to practice attacks from the sea and water combat drills. But, the rising pollution levels have made large parts of this training area too dangerous to use.
A recent report from the Department of Defense Office of Inspector General says that the current pollution levels may force the military to cancel or move as much as 75% of Navy water training.
This is not just a problem—it’s risky for our safety. The SEALs and Marine special operations units train based on realistic settings and being able to adjust to different environments. Losing the Coronado shorelines means losing one of the best places to get troops ready for real missions because it is easy to get to and has different kinds of environments.
Also, troops who do training exercises without knowing all the dangers from pollution could get sick with sinus infections, staph skin infections, or stomach problems. This would make them less ready to do their jobs.
Military families are also affected. Some staff are stationed near or live in the areas that are polluted. This means that public health problems also start to hurt the morale, health, and readiness of staff who are not even sent out on missions.
Environmental Impact: The Pacific Ocean and More
The Tijuana River sewage problem does harm to more than just human health. It also damages fragile natural areas along the California and Baja California coast. Sea life in the Eastern Pacific is already under a lot of stress from changing weather, rising sea temperatures, and plastic pollution. Sewage runoff just makes this ecological damage happen faster.
Some of the most at-risk areas are
- Kelp forests, which are important for taking in carbon and sheltering sea life. They are hurt by dirtier water and too much bacteria.
- Estuaries and tidal areas, which are needed by migrating birds and amphibians. They are poisoned by pollution in the mud.
- Fisheries, where pollution causes poisons to build up in animals like shrimp, clams, and bass. This is a health risk for people who eat them and causes money problems for fishers.
Beaches that used to be safe places for tourists are now marked as dangerous areas. This hurts local businesses that depend on tourists, rentals, and businesses that are open during certain seasons. The damage also spreads into the Baja California waters. Ocean currents don’t care about borders, and they carry the damage everywhere.
Why the Systems are Broken
The main reason for this crisis that has gone on for decades is systems that don’t work—especially on the Mexican side of the border. The city of Tijuana has grown fast in the last 20 years. But its old systems for treating wastewater and managing rainwater have not grown to handle the increase.
Most worrying is the use of combined sewer systems. These systems send both rainwater and human waste that is not treated into the same pipes. When it rains, even a little flooding is too much for the systems to handle. This leads to waste being sent directly into the Tijuana River system—which happens often.
The U.S. side has tried to do things to help. Projects like basins to catch dirt and gates to change the flow of water have been put in place to stop the flow. But these have often been slowed down by limits on who controls what, not enough money, and government rules that take too long. At the same time, natural wearing away of land and more people living in the area are making the problem worse faster than these fixes can stop it.
Both Parties Angry & Pressuring Mexico
It’s rare for politicians who disagree on many things to agree on anything. But the Tijuana River sewage problem has made people from different parties agree. Officials from both political parties, at both the state and federal level, are demanding quick action.
Senator Tim Sheehy of Montana strongly criticized the Mexican government, especially the new President Claudia Sheinbaum. He said, “It’s hurting our servicemen, our citizens, and our national security.”
In California, lawmakers and groups like the San Diego Regional Water Quality Control Board have made formal complaints. They point to neglect of agreements between the two countries and failure to meet Clean Water Act goals. The language being used is getting stronger. It suggests that if cooperation doesn’t happen, the U.S. might push for trade punishments, stopping funds, or other actions to penalize Mexico.
International Rules and Problems with Diplomacy?
Under the 1944 U.S.-Mexico Water Treaty, both countries are supposed to manage water fairly and work together through the IBWC (International Boundary and Water Commission). But the Commission’s limited power to enforce rules makes it mostly just an advisory group.
People who work in environmental law argue that the way it is set up now is old and not good enough to deal with the amount of pollution today. The Treaty focuses on sharing water and flood control, not on pollution rules. This leaves a lot of unclear legal areas.
Without stronger ways to step in, the Commission becomes just a middleman that can’t solve or even stop crises. If problems can’t be fixed through talking and agreements, U.S.-Mexico relations will face more tension. This is especially true because of other ongoing problems like immigration policies and trade rules.
EPA’s Response & Federal Oversight
New leaders at the Environmental Protection Agency seem ready to finally deal with what many have called a slow disaster. Administrator Lee Zeldin is planning to visit San Diego, which shows a change in how things are being approached—from just making things a little better to actually fixing the problem.
“The health of our military, people who live here, and natural areas has been ignored for too long,” Zeldin said in a statement promising long-term plans to fix the problems. His office has suggested ideas like
- Special federal money for sewage cleanup projects.
- Emergency funds to protect the environment, like how FEMA responds to disasters.
- Groups that include different agencies like the Department of Defense and Department of State.
Local Voices: California Pushing for Change
Local groups are not willing to wait for the federal government to act. Groups like the Surfrider Foundation, Wildcoast, and groups in Imperial Beach are speaking out loudly and taking legal action.
Current ideas at the state level include
- Building basins to catch storm water along important border paths.
- Putting concrete covers on channels to stop wastewater from leaking out.
- Suing the federal government under environmental law for not protecting Californians from harm that could be predicted.
Along with local governments, these community actions keep making the public aware and pushing lawmakers to find bigger, faster solutions.
Nationwide Effects: A Model for Future Border Problems?
The Tijuana River sewage problem is a warning sign of a new kind of problem: “eco-security threats.” Environmental breakdowns at borders that are politically sensitive can be—and will be—used, ignored, or misunderstood.
Water pollution, air pollution, and loss of natural resources are likely to become political hotspots in the coming years. If friendly countries like the U.S. and Mexico can’t handle shared problems well, what does that mean for border areas near countries that are enemies?
Possible Solutions: What Can Be Done?
Even though things look bad and the risks are growing, there are real solutions. They include
- The U.S. and Mexico jointly investing in fixing the Tijuana Wastewater Treatment Plant and systems.
- Making the IBWC stronger by giving it the power to enforce laws and updating the treaty agreements.
- Health checks and programs to pay troops and people who have been harmed by being exposed to the pollution.
- Checking water quality in real-time and setting up public alert systems for people who live there and military planners.
- Quickly setting up temporary dams to change the flow of water and mobile water cleaning units at places where overflows happen.
Big, long-term plans to be stronger in the face of these problems might include changing how we think about responsibility across borders. This could mean having joint environmental management areas that are not limited by national borders.
From Sewage to Security: A Border Wake-Up Call
The Tijuana River sewage crisis didn’t happen suddenly, and it won’t be fixed suddenly—but ignoring it is no longer possible. Poisonous flows across the U.S.-Mexico border harm children, soldiers, natural areas, and the economy. This isn’t just an environmental problem; it’s a real example of how Mexico pollution can directly weaken US national security.
The crisis is both a warning and a chance: to fix diplomacy, rebuild systems, and rethink how countries act when natural systems break down. The land, water, and air are shared—and it’s time our solutions were too.
Sources
- Fox News. (2024). More than 100 billion gallons of raw sewage have seeped into the U.S. via the Tijuana River over the past several decades. Retrieved from https://www.foxnews.com/politics/epa-chief-takes-mexican-sewage-crisis-flowing-us-waters-where-navy-seals-train
- Fox News. (2024). Mexico is currently dumping 5 million gallons of sewage per day into the Tijuana River. Retrieved from https://www.foxnews.com/politics/epa-chief-takes-mexican-sewage-crisis-flowing-us-waters-where-navy-seals-train
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