Decades-Long Mystery Solved: Sewer Leaks Poison Linda Mar Beach

Linda Mar Beach in Pacifica has faced persistent fecal bacteria contamination for decades. The issue has now been traced to leaking sewer pipes, with pollution levels far exceeding safe limits. Authorities are taking action to address the problem after years of uncertainty. The contamination at Linda Mar Beach has long been a concern, placing it on the Surfrider Foundation’s top 10 list of bacterial hotspots. The southern end of the beach, where San Pedro Creek meets the ocean, shows the highest levels—often 30 to 40 times above human health thresholds. For years, the source remained unclear, with suspicions ranging from wildlife to human waste.

The San Pedro Creek Watershed Coalition, formed in 1988, has investigated the pollution for decades. Recent findings confirm that the bacteria originate primarily from human intestinal tracts. The culprit appears to be Orangeburg pipes, a type of sewer material used widely in the area. These pipes, known for their leakiness, have likely allowed untreated sewage to seep into the creek and onto the beach.

In response, the City of Pacifica is replacing miles of aging sewer mains. Property owners are also being encouraged to upgrade their own sewer laterals through financial incentives. Despite ongoing efforts, visitors are still advised to avoid the southernmost section of the beach, particularly during the rainy season. Safer areas remain north of the Taco Bell Cantina. The discovery of leaking Orangeburg pipes as the contamination source marks a turning point in addressing Linda Mar Beach’s pollution. With infrastructure upgrades underway, officials aim to reduce bacterial levels and improve public safety. Until then, warning signs and advisories will remain in place for beachgoers.