Brian Barton
Southern California is known for its beautiful beaches, but not all of them are safe for swimming. In fact, many of them are polluted with high levels of bacteria, indicating the presence of fecal matter in the water, which can cause various health issues such as eye infections, vomiting, and diarrhea. The sources of this pollution include leaking sewage systems and stormwater runoff carrying urban pollution into the ocean. Heal the Bay, a nonprofit organization, releases an annual report on the most polluted beaches in California, and their recent report revealed that some of the most polluted beaches in Southern California include the Santa Monica Pier, Mother's Beach in Marina del Rey, and Inner Cabrillo Beach.
| Characteristics | Values |
|---|---|
| Number of beaches monitored in Southern California | 200+ |
| Number of beaches monitored by Heal the Bay | 600+ |
| Number of beaches monitored by Heal the Bay along the Pacific Coast | 700+ |
| Percentage of beaches in California that received A or B water-quality grades during the summer months | 90% |
| Number of beaches in Southern California that received A+ grades | 12 |
| Number of beaches in Southern California that made it to the Honor Roll | 62 |
| Locations of Honor Roll beaches | LA, Orange, Ventura, San Diego, and Ventura Counties |
| Causes of pollution | Sewage systems, stormwater runoff, aging infrastructure, climate change, bird droppings |
| Potential health consequences of swimming in polluted waters | Eye infections, vomiting, diarrhea, cholera |
| Examples of polluted beaches in Southern California | Santa Monica Pier, Tijuana River Mouth, Imperial Beach, Border Field State Park, Mother's Beach, Linda Mar Beach, Lakeshore Park |
| Examples of clean beaches in Southern California | Riviera Beach, Emerald Bay Beach, County Line Beach, Broad Beach, Capistrano Beach Park, Mandalay Beach, Silver Strand |
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What You'll Learn
Tijuana River Mouth, San Diego County
The Tijuana River has been at the centre of a pollution crisis on the US-Mexico border for decades. The river has been subject to repeated failures and overflows, with tens of millions of gallons of raw sewage, polluted stormwater, trash, chemicals, and sediment being dumped into it. This has resulted in public health impacts, closed beaches, and massive environmental degradation of the Tijuana River Estuary and coastal marine waters from Tijuana to Coronado. The pollution has also had a detrimental effect on tourism, discouraging visitors from enjoying some of San Diego's most popular coastal areas.
The sources of pollution in the Tijuana River are varied. Raw sewage overflows on the Mexican side, from canyons along the river, are a recurring problem despite cross-border efforts to clean it up. In addition, trash, chemicals, and sediment are carried downstream, causing damage to vegetation, contributing to flooding, and filling in estuaries to transform coastal marsh habitat into dry land. The scale of the problem is immense, affecting wide areas from Tijuana to San Diego, compromising water quality, shutting down beaches, endangering marine ecosystems, and posing serious health risks to local communities.
The Tijuana River Estuary, recognised as a "Wetland of Global Importance" by the UN's Ramsar Convention, has been severely degraded by decades of pollution. The Estuary and offshore habitats are home to hundreds of terrestrial and marine species, providing undeveloped habitat critical to protecting and promoting biodiversity. However, the excessive flow of pollutants has taken its toll, with huge volumes of plastic trash accumulating in the Estuary.
The pollution crisis in the Tijuana River has been primarily attributed to a combination of outdated infrastructure and inadequate maintenance and upgrades in both Mexico and the US. The US agency responsible for treating much of the sewage has let its treatment plant fall into almost complete disrepair. Furthermore, worsening climate change and crumbling infrastructure due to severe storms have exacerbated the problem by increasing urban runoff that pollutes the sea.
To address the Tijuana River pollution crisis, it is critical for the US and Mexican governments to invest in improving infrastructure to reduce pollution that leaks into the seawater. This includes investing in more stormwater capture projects that will cleanse, hold, and reuse water rather than sending polluted runoff to the sea. Additionally, advocates encourage individuals to do their part in keeping beaches clean by not sending trash down street drains or dumping it at inland lakes, as it eventually finds its way to the ocean.
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Santa Monica Pier, Los Angeles County
Santa Monica Pier in Los Angeles County has been identified as one of California's most polluted beaches, ranking third on Heal the Bay's "Beach Bummer" list in 2024 and second in 2025. The beach has consistently shown high levels of bacterial pollution, with a failing grade in the annual Beach Report Card, which evaluates over 700 beaches along the Pacific Coast.
The pollution at Santa Monica Pier is a persistent issue, with the beach receiving failing grades despite years of remediation efforts. The primary source of pollution is attributed to bird droppings and urban runoff, resulting in high levels of fecal-indicator bacteria, particularly during the dry summer season. This has led to public health concerns, as swimming in contaminated water can cause various illnesses, including rashes, ear and upper respiratory infections, and stomach bugs.
In response to the failing grades, Santa Monica city officials have acknowledged the localized nature of the contamination, stating that the majority of their three-mile coastline is highly rated by Heal the Bay. The city has also committed to prioritizing efforts to identify and reduce bacteria levels at the pier. However, the exact causes of the pollution remain unclear, and a task force has been formed to investigate further.
The high levels of bacterial pollution at Santa Monica Pier have led to advisories from L.A. County officials, warning people not to swim, surf, or play in the water within 100 yards on either side of the pier. Heal the Bay, a nonprofit organization, has been monitoring the water quality and has reported that the Santa Monica Pier has consistently received failing grades, indicating the need for urgent improvements to ensure the safety of beachgoers.
Overall, the pollution at Santa Monica Pier in Los Angeles County is a significant concern, impacting the health and well-being of residents and visitors. While efforts are being made to address the issue, it remains a challenge to improve the water quality at the beach. The persistent pollution at Santa Monica Pier highlights the importance of investing in infrastructure upgrades and stormwater capture projects to reduce urban runoff and improve the overall health of California's beaches.
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Imperial Beach, San Diego County
Imperial Beach in San Diego County has been named one of the most polluted beaches in Southern California, and even the United States, by the Surfrider Foundation. Located at the southernmost tip of San Diego County, near the Mexico border, Imperial Beach has been saturated with pollution for decades. The primary source of pollution is untreated sewage from across the border, with a failing treatment plant leaking contaminated water into the Tijuana River Estuary. This has resulted in high levels of bacteria in the ocean water, which can lead to eye infections, vomiting, and diarrhea. The Surfrider Foundation's report also noted that the water in Imperial Beach contains stormwater runoff, harmful chemicals, and trash, creating a severe pollution problem.
The Tijuana River has been designated as 'endangered' due to this sewage crisis, which has been ongoing for over three decades. The long duration of this environmental disaster has led to water quality issues becoming pervasive in the daily lives of residents in the area. South Bay businesses have suffered, and locals have reported physical illnesses and foul stenches. The situation is made worse by worsening climate change and crumbling infrastructure, with more frequent and severe storms exacerbating the urban runoff that pollutes the sea.
The Surfrider Foundation's Clean Water Report collected thousands of samples from dozens of beaches to fill gaps in water quality testing and reveal chronic pollution problems. Imperial Beach was one of only two beaches where every water sample collected recorded levels of bacteria exceeding recreational health standards. Heal the Bay, another organisation monitoring beach pollution, has also listed several beaches in San Diego County among the most polluted, including the Tijuana River Mouth, Tijuana Slough, Imperial Beach at Seacoast Drive, and Border Field State Park.
Despite the pollution issues, there is some positive news. Heal the Bay's 34th annual Beach Report Card for 2023-2024 gave A or B water-quality grades to nearly 90% of monitored California beaches during the dry-weather summer months. This includes Southern California beaches from Santa Barbara to San Diego counties. Additionally, 12 California beaches made it to Heal the Bay's Honor Roll, earning perfect A+ grades every week in all summer and winter reporting periods. Two of these beaches are in San Diego County, indicating that there are still some relatively safe options for beachgoers in the area.
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Border Field State Park, San Diego County
Border Field State Park in San Diego County is a unique beach experience, where the US and Mexico meet. It is the southernmost beach in California, starting at the Mexican border and continuing north to the mouth of the Tijuana River. The beach is a vast natural setting, jointly managed by the state of California and the adjacent Tijuana River National Estuarine Research Reserve.
The beach is known for its pollution issues, ranking 8th on Heal the Bay's "Beach Bummer" list, which grades over 700 beaches on the Pacific Coast based on bacterial pollution levels. The beach has signs warning of sewage contamination in the ocean, and visitors are advised not to swim due to unsafe pollution levels. The water quality is impacted by the Tijuana River, which has experienced failures in wastewater treatment plant infrastructure, leading to cross-border flows of contaminated water and mud. These issues have resulted in the park's roads and entrances being regularly closed, especially during the winter months.
Despite the pollution, the beach offers an interesting and educational experience. Visitors can observe the fence extending into the water and the presence of Border Patrol agents. It provides a beautiful view of the ocean and a remote feel despite its proximity to a metropolitan area. The park features picnic areas, BBQ grills, restrooms, a grass park, and accessible trails. However, due to its inaccessibility, the beach is often underused. Visitors should be prepared for a lengthy walk of about 1.5 to 1.8 miles each way and are advised to check ahead as road and safety conditions can change frequently.
The Tijuana Estuary Visitor Center, located at 301 Caspian Way in Imperial Beach, is a recommended starting point for visitors seeking information about the unique state park and the adjacent reserve. While Friendship Park within the state park has been closed since the COVID pandemic, the overall experience of visiting Border Field State Park is worth the drive, especially to witness the humanity of the shared border and to appreciate the beauty of the sea.
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Linda Mar Beach, San Mateo County
Linda Mar Beach in San Mateo County, also known as Pacifica State Beach, is one of the most polluted beaches in California. It has been given an F grade on Heal the Bay's Beach Report Card and has made the "beach bummer" list five times since 2017. The beach has consistently high bacteria levels, which can cause various health issues such as eye, ear, nose, and throat infections, as well as gastrointestinal diseases.
The main source of pollution at Linda Mar Beach is San Pedro Creek, which channels urban runoff, stormwater, animal waste, and leaked wastewater directly into the ocean. The beach is located in a densely urbanized watershed, with high concentrations of homes and businesses nearby, contributing to the pollution. According to the Surfrider Foundation, a clean water watchdog, San Pedro Creek failed to meet health criteria for fecal indicator bacteria 73% of the time it was tested in 2022.
In addition to San Pedro Creek, there are other sources of pollution that contribute to the high bacteria levels at Linda Mar Beach. These include old sewer lateral pipes that leak sewage into the creek, stormwater and dry weather runoff, and animal waste from dogs, horses, birds, and other wildlife. The beach's proximity to the Anza Pump Station water treatment facility may also be a factor.
Local government organizations, such as Pacifica's Public Works Department and the San Francisco Bay Regional Water Quality Control Board, have been working to reduce pollution at the beach. Initiatives include installing new pet waste pick-up stations and conducting annual inspections of dog and horse facilities near the creek. While there has been some improvement, the beach still exceeds state safety standards, and additional testing stations are recommended to get a more accurate reading of the water quality.
It is important to note that while Linda Mar Beach faces significant pollution challenges, it is also one of the most popular beaches in San Mateo County for locals and tourists, offering a range of recreational activities such as swimming, surfing, and boating.
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