Body of News Release
Bolinas, CA – After a temporary closure to investigate potential contamination concerns, the County of Marin has reopened the affected sections of Bolinas Beach under an advisory, warning visitors of a potential human health risk due to on-site contamination and instability of the bluff face. This decision reflects the latest test results by the San Francisco Bay Regional Water Quality Control and ongoing efforts to address long-standing wastewater concerns in the Bolinas Mesa area.
The closure was initiated in September 2024 following observations of liquid seeping from the bluffs above the beach, with discoloration, crystallization, and odor in the surrounding soil. These conditions have been known to exist for decades. Initial testing revealed the presence of ammonia, coliform bacteria, E. coli, and enterococcus—indicating the likelihood of wastewater contamination. Out of caution and in compliance with California Code of Regulations Section 7957, the County closed affected areas the beach below the bluffs to protect public health.
However, recent tests conducted by the Regional Water Quality Control Board did not find similar results. Samples taken in September and November included both water seeps and soil, and no evidence of wastewater from septic systems was detected. While testing did not find human waste in the sampled areas, conditions exist that pose a risk to public health. In addition to chronic fecal contamination from multiple sources, including wildlife and pet waste, the bluffs are unstable and are prone to erosion and collapse. Considering the test results and observations from site visits, the County has updated the status of the affected sections of Bolinas Beach from closure to advisory.
Signs will soon be posted to warn visitors about potential dangers, including known contamination bluff soils and water that could cause illness, and the possibility of rockfalls and slides due to unstable bluffs. The County strongly recommends avoiding direct contact with the water or sand in areas directly adjacent to the bluffs, including swimming and wading. If you have direct exposure with water or soil, wash your hands before eating or drinking.
The County remains committed to supporting the Bolinas community in addressing the broader wastewater issues on the Bolinas Mesa. This includes collaborating with the Bolinas Community Public Utility District to investigate feasible wastewater treatment improvements and working with local businesses on economic vitality and resiliency planning.
“We appreciate the community’s patience and cooperation as we continue working to protect public health and support long-term solutions for Bolinas,” said Dr. Lisa Santora, Public Health Officer for the County of Marin. “With new data in hand, we can cautiously restore access to this cherished part of our coastline. However, work remains in identifying factors contributing to the seepage and there are many lessons learned about how the County can better respond to issues like this in the future.”
For updates and additional information, please visit the Bolinas Beach informational webpage.