Decades-Long Mystery Solved: Faulty Pipes Behind Pacifica's Polluted Beach

Linda Mar Beach in Pacifica has faced chronic fecal bacteria contamination for decades. The pollution, concentrated at the southern end, often exceeds safe levels by 30 to 40 times. Now, after years of uncertainty, the source of the problem is becoming clearer. The contamination in San Pedro Creek, which flows into Linda Mar Beach, has long puzzled experts. Humans, wildlife, and pets were all suspected, but the exact cause remained unknown. Recent investigations point to faulty sewer pipes, particularly Orangeburg pipes—a material known for cracking and leaking over time.

The San Pedro Creek Watershed Coalition, formed in 1988, has been studying the issue for years. Their work, alongside volunteers, environmentalists, and researchers, continues despite potential cuts to federal funding. The City of Pacifica is also taking action by offering residents £2,000 to replace aging sewer laterals.

Tests show the bacteria mostly comes from human waste. This has kept Linda Mar Beach on the Surfrider Foundation’s top 10 list of bacteria hotspots for decades. Authorities now urge visitors to heed warning signs, especially during the rainy season when contamination worsens. Efforts to clean up the beach are ongoing, with local groups and officials pushing for solutions. The city’s financial incentive aims to reduce leaks from old pipes. Until then, the southern end of Linda Mar Beach remains a high-risk area for swimmers and surfers.