Bacteria Levels Spike at L.A. County Beaches as Officials Warn Swimmers to Stay Out of Certain Areas

As Los Angeles bakes under summer heat, the beach feels like the city’s oldest promise: cool water, soft sand, and a little relief from the pavement. But this week, that promise comes with a warning.

Public health officials are urging residents and visitors to stay out of the water at several Los Angeles County beaches after recent samples showed elevated bacteria levels exceeding state health standards.

The advisory does not mean every beach in L.A. County is closed. It means we need to pay attention to the exact locations where contact with ocean water may increase the risk of illness.

Why Bacteria Warnings Matter During a Heat Wave

This advisory lands at a rough time. Los Angeles County has been under heat advisories for several areas, including the Santa Clarita Valley, San Fernando Valley, San Gabriel Valley, mountain areas, and the Los Angeles Inland Coast.

The county warned that high temperatures can lead to heat exhaustion, heat stroke, and heat cramps, with parts of the advisory running from Tuesday, July 7, through Friday, July 10, and the Los Angeles Inland Coast included from Wednesday, July 8, through Friday, July 10.

That creates the classic summer conflict: the hotter it gets inland, the more we want to run toward the coast. But when bacteria warnings are posted, the smartest move is not to ignore the ocean; it is to use it carefully.

We can still walk, sit on the sand, enjoy the breeze, and visit nearby businesses. What we should avoid is water contact inside the posted warning zones, especially for children, older adults, pregnant people, and anyone with a weakened immune system.

L.A. County Beaches Under Bacteria Warnings

The current bacteria warnings affect several popular beach destinations across Los Angeles County, from Malibu and Pacific Palisades to Marina del Rey, Santa Monica, and San Pedro.

Health officials are asking visitors to avoid swimming, surfing, wading, and other activities involving contact with ocean water in these specific areas until new test results confirm that bacterial levels have returned to acceptable standards.

• At Will Rogers State Beach, the warning applies to the area extending 100 yards in both directions along the coastline from the storm drain. Officials are advising visitors to stay out of the water around this section because recent samples showed bacteria levels above state safety limits.
• At Paradise Cove in Malibu, the affected area covers 100 yards up and down the coast from Ramirez Creek. Creek outlets can carry runoff into the ocean, especially during periods of heavy urban activity, making nearby waters more vulnerable to elevated bacteria levels.
• At Mother’s Beach in Marina del Rey, the warning covers the entire designated swim area. Because this location is a more enclosed beach environment, officials are advising visitors to avoid entering the water until testing shows conditions have improved.
• At Inner Cabrillo Beach in San Pedro, the entire swimming area is also under a bacterial warning. Families and regular beach visitors who normally use this protected swimming area should wait for updated guidance before returning to the water.
• At Topanga County Beach, the warning applies to an area extending 100 yards along the shoreline from the Castlerock storm drain. Officials are urging swimmers and surfers to avoid contact with the water in this zone.
• At Topanga Canyon Beach in Malibu, the warning covers 100 yards up and down the coast from the lagoon area. Lagoon and creek locations are closely monitored because they can influence nearby ocean water quality.
• At Santa Monica Pier, the affected area extends 100 yards in both directions along the coast. The popular beach destination remains a place where visitors should heed posted water-quality warnings before entering the ocean.
• Officials have also confirmed that the previous warning near Redondo Beach Pier has been lifted after follow-up testing showed bacteria levels had returned to within state standards. The update highlights how quickly beach conditions can change and why visitors should check the latest advisories before swimming.

The warnings are temporary safety measures, not permanent beach closures. Most of Los Angeles County’s coastline remains open, but visitors should avoid the specific areas listed until public health officials confirm that water quality has improved.

County Health Officer Muntu Davis has warned residents to take heat seriously, saying, “Heat causes more deaths in the U.S. annually than floods, storms, and lightning combined.”

His heat guidance matters here because many people will still head outdoors for relief, making beach safety and heat safety part of the same public-health picture.

What Elevated Bacteria Levels Can Do to Swimmers

Elevated bacteria levels do not always make the water look dirty. That is part of the danger. Ocean water can appear calm, blue, and inviting while still carrying contamination from runoff, storm drains, creeks, lagoons, wildlife waste, or urban pollution.

The risk is not just “getting wet.” The risk increases when contaminated water gets swallowed, enters the ears, touches irritated skin, or reaches cuts and wounds.

Swimming-related illnesses commonly include diarrhea, skin rashes, swimmer’s ear, flu-like illness, pneumonia, and eye or lung irritation.

The CDC says people can become sick by swallowing contaminated water, touching contaminated water, or breathing in mist from it, and that children, pregnant women, and people with weakened immune systems face a higher risk.

This is why the warning language is broad. It is not only about swimming laps. It includes surfing, splashing, bodyboarding, wading, and letting kids play at the waterline. If the advisory says to avoid contact with ocean water, we should treat shallow water with the same caution as the deeper surf.

Why Storm Drains, Creeks, Lagoons, and Piers Keep Appearing on the List

A clear pattern runs through the warning zones: storm drains, creeks, lagoons, enclosed swim areas, and piers show up again and again. These places can trap or deliver bacteria into the surf zone.

Storm drains and creeks can carry urban runoff from streets and neighborhoods. Lagoons and enclosed beaches can have weaker water circulation. Piers can create complex local conditions in which contamination lingers.

That is why the advisory is often written in precise distances, such as 100 yards up and down the coast from a storm drain, creek, lagoon, or pier. The county is not saying the entire Los Angeles coastline is unsafe. It is drawing a boundary around areas where recent test results showed bacteria levels above health standards.

The broader monitoring system looks for fecal indicator bacteria, including total coliform, fecal coliform, and Enterococcus. The Los Angeles County Sanitation Districts conduct bacterial monitoring along the shoreline, inshore, and offshore areas, including 17 sampling locations, with 8 shoreline stations sampled weekly. Those results help public health officials manage beaches and protect public safety.

Santa Monica Pier Remains a Familiar Trouble Spot

The Santa Monica Pier warning will feel familiar to many Angelenos because the area has long struggled with bacterial water quality issues. In its 2025–2026 Beach Report Card, Heal the Bay said the Santa Monica Pier continues to rank among California’s most polluted beaches during dry weather conditions and noted ongoing work to investigate bacteria pollution sources near the pier.

That does not mean Santa Monica Beach as a whole should be treated as unsafe every day. It means the pier area deserves extra caution when warnings are posted. We should check the latest advisory before entering the water, avoid swimming near the pier when bacteria levels are high, and remember that a crowded, beautiful beach can still have an invisible water-quality problem.