Catherine Breed Completes 900 Mile Swim Along California Coast

After 111 days in the Pacific Ocean, endurance swimmer Catherine Breed completed a nearly 900-mile journey along California's coastline on Monday, Oct. 19, 2026, reaching Coronado in San Diego County. The 33-year-old American began the expedition on July 1 near the Oregon border, aiming to test her endurance while drawing attention to ocean conservation and coastal pollution.

According to the Santa Cruz Sentinel and The Press Democrat, Breed's expedition, known as Swim California, is believed to be the first completed staged swim of the state's entire coastline. Formal ratification remains subject to review of the supporting records.

Breed covered approximately 10 miles per swimming day, completing the route in stages with support from a crew aboard a 52-foot sailboat. GPS waypoints connected successive swims, while observers documented her progress for verification. She slept aboard the support vessel and received assistance with nutrition, recovery and navigation.

Her final stages brought her past Imperial Beach and the Tijuana River mouth, where cross-border sewage pollution has repeatedly contaminated coastal waters. Breed's team had identified the area as a high-risk section during planning and tracked beach closures before choosing a route farther offshore.

During an interview with KPBS, Breed described the significance of the pollution problem for nearby residents.

"It's just heartbreaking that there's a beach in California that the people that live in that area can't go to and stay safe and stay healthy," Breed said.

She contrasted her opportunity to spend months swimming in the ocean with the restrictions facing people who live near contaminated beaches.

"It's kind of interesting to think that I get to spend four months in the ocean, and there's people who live near the ocean and can't even spend four minutes in the water because it's so dirty," Breed said.

According to KPBS, Breed planned to swim about a mile offshore to reduce her exposure to polluted water. She also planned to take preventive antibiotics. The approach addressed a risk that had been included in the expedition's planning from the beginning.

Aurora Czajkowski, a marine chemistry student at UC San Diego's Scripps Institution of Oceanography who researches the cross-border sewage crisis, explained how contamination spreads through coastal waters.

"When we have pollution enter our ocean from a river mouth, it is like, contained in what we call a plume," Czajkowski said.

The plume originating near the Tijuana River can spread through coastal waters and become trapped in the surf zone. Czajkowski, who grew up in Imperial Beach, said she hoped the expedition would bring wider attention to communities affected by the longstanding crisis.

"I hope that her journey will kind of highlight that the South Bay San Diego communities do have a lot to give to our communities," Czajkowski said.

Beyond pollution, Breed faced severe weather, powerful waves and unusual ocean currents. She told KPBS that conditions associated with an expected strong El Niño had reversed the typical north-to-south coastal current, making progress more difficult. The team also navigated tropical storms, exposed stretches of coastline and waves reaching approximately 7 feet.

Marine heatwaves also changed the conditions Breed encountered. She observed humpback whales, manta rays and devil rays in areas where she said such sightings were unusual. During the journey, she also collected floating plastic, including balloons found along the Los Angeles and Orange County coastlines.

Breed described the environmental impact she witnessed in a statement reported by the Santa Cruz Sentinel and The Press Democrat.

"I have spent my life loving this coast. Swimming it gave me hundreds of new reasons to protect it," Breed said.

She continued by describing the wildlife, litter and conservation work she encountered along the route.

"I saw whales beneath me, plastic beside me, and communities giving their time to look after these places. I hope people who followed this journey choose one place they love and find a way to take care of it," Breed said.

Breed connected the expedition with public outreach through Sea Dreamers, her nonprofit organization, meeting coastal communities to discuss marine wildlife, kelp forests, water quality and public access. The journey also included conversations with conservation groups about protecting coastal ecosystems.

The expedition demanded more than sustained physical effort. According to The Press Democrat, the crew had to coordinate boat transfers, sleep schedules, nutrition and recovery while waiting for safe weather windows along remote stretches, including Big Sur.

Breed previously swam the English Channel in 2018 and the North Channel between Northern Ireland and Scotland in 2019. She also set a record swimming the length of Lake Tahoe in 2017 and completed a 30.2-mile swim from the Farallon Islands to the Golden Gate Bridge.

A former University of California, Berkeley, collegiate swimmer and member of the US national team, Breed left a career in medical technology sales to pursue the California expedition. Her 111-day swim concluded with a ceremonial arrival at Coronado on Monday afternoon, bringing the planned journey from the northern state border to the Mexican border to an end.