8 Dirtiest Beaches in the U.S. That Could Make You Change Your Vacation Plans
A beach can look perfect from the parking lot. The sand may glow, the water may sparkle, and families may already be spreading towels near the shoreline. Yet beneath that postcard setting, bacteria can turn an afternoon swim into a serious health gamble.
The Surfrider Foundation’s latest Clean Water Report analyzed 10,157 samples collected from 620 coastal and recreational water sites during 2025. Sixty-five percent of the monitored locations produced at least one result that exceeded state health standards. The eight destinations below recorded some of the most troubling bacteria rates in the report.
These locations are not necessarily covered in visible garbage, and the report does not claim they remain unsafe every day. In this case, “dirty” refers to repeated evidence of elevated bacteria, sewage exposure, polluted runoff or related water quality problems.
Punaluʻu Beach Park, Oahu, Hawaii
Punaluʻu Beach Park proves that tropical beauty does not automatically guarantee clean swimming water. According to Surfrider’s report, every sample collected at this location during the reporting period failed to meet Hawaii’s recreational water health standard, producing a 100 percent high bacteria rate.
That figure should immediately place the park on a traveler’s caution list. Visitors may still enjoy the scenery, but entering the water requires more preparation than simply checking the weather forecast.
Conditions can change between testing dates, so travelers should review current local advisories before swimming. A calm ocean and bright sunshine cannot reveal bacteria that are invisible to the naked eye.
Moloaʻa Stream Mouth, Kauai, Hawaii
Moloaʻa Beach offers the kind of lush, secluded setting that often attracts visitors hoping to escape Hawaii’s crowded resort areas. The stream mouth, however, recorded a 100 percent high bacteria rate in Surfrider’s 2025 testing.
Stream mouths deserve extra caution because they carry water from the surrounding land into the ocean. Stormwater can transport animal waste, leaking wastewater, soil and other contaminants toward coastal swimming areas. The Environmental Protection Agency identifies runoff, leaking septic systems and wastewater discharges among the potential sources of fecal indicator bacteria.
Travelers should avoid treating every part of a long beach as though it has identical water quality. Conditions near a stream, drainage outlet or stagnant pool can differ sharply from those farther along the shoreline.
Park View Kayak Launch, Miami Beach, Florida
Miami Beach sells sunshine, warm water and an almost permanent vacation mood. Park View Kayak Launch presents a very different side of that coastal lifestyle.
Surfrider reported that 92 percent of the samples collected at this location exceeded Florida’s recreational water health standard. The organization also identified the site as one of the nation’s recurring beach bacteria hot spots.
Kayakers and paddleboarders may assume they face less exposure than swimmers because they plan to remain above the water. That confidence can disappear after a fall, a splash to the face or contact through an open cut.
The Environmental Protection Agency warns that swimming in sewage-polluted water can cause gastroenteritis. Other possible problems associated with contaminated recreational water include skin, ear and respiratory infections.
Imperial Beach, California
Imperial Beach has become one of America’s most visible examples of a beautiful community trapped beside a massive pollution problem. Surfrider assigned the location an 89 percent bacteria rate based on the number of closure days issued by San Diego County.
The problem reaches far beyond an occasional bad water sample. Wastewater, industrial pollution, and runoff from the Tijuana River flow into the Pacific Ocean near the border, affecting beaches in southern San Diego County.
Researchers at the University of California San Diego reported that several local beaches had remained closed almost continuously for years because of high bacteria levels connected to wastewater runoff. Their research also detected wastewater-related pollutants in both ocean water and coastal aerosols, although the long-term health effects require further study.
Imperial Beach still has a fishing pier, ocean views, and a community that continues fighting for cleaner water. For travelers, however, the beach belongs on a list of places where checking current closures is essential, not optional.
Hakipuʻu Boat Ramp, Oahu, Hawaii
Hakipuʻu Boat Ramp recorded an 82 percent high bacteria rate in Surfrider’s 2025 report. That means more than eight out of every ten samples failed to meet the state standard used to protect people recreating in the water.
Boat ramps are often overlooked in conversations about beach pollution. Yet people launch kayaks, handle equipment, wade through shallow water, and allow children or pets near the shoreline at these access points.
The setting may not resemble a traditional resort beach, but the exposure risk still matters. Water can enter the mouth, eyes, or an uncovered wound during an ordinary launch.
A warning sign should never become part of the scenery that visitors automatically ignore. When officials recommend avoiding contact, changing the day’s plans remains far easier than dealing with an illness during a vacation.
Ballard Park, Melbourne, Florida
Ballard Park sits along the Indian River Lagoon and offers picnic areas, boating access and waterfront views. Its water quality record, however, demands attention.
The location produced a 76 percent high bacteria rate in Surfrider’s report. Only about one quarter of the samples met the applicable recreational health standard.
The name “park” may create a sense of safety, particularly for families looking for a quieter alternative to Florida’s ocean beaches. Yet attractive landscaping, playgrounds and calm water do not prove that a swimming area is safe.
The Centers for Disease Control and Prevention advises visitors to check whether a natural swimming area is monitored, under an advisory, or officially closed before entering. The agency also warns that swallowing even a small amount of germ-contaminated water can cause illness.
Linda Mar Beach, Pacifica, California
Linda Mar Beach is a familiar surfing destination just south of San Francisco. Surfers, dog walkers and families regularly gather along its broad crescent of sand, but the beach has also struggled with recurring bacterial contamination.
Surfrider reported that 72 percent of its samples at Linda Mar exceeded California’s recreational water health standard. The organization’s San Mateo County volunteers have been investigating pollution and working with the community to identify possible solutions.
That rate does not mean the entire beach remains dangerous throughout the year. It does mean visitors should resist assuming that cool water, strong waves, or an active surfing crowd guarantee acceptable water quality.
Rain deserves particular attention. The EPA notes that people can face greater exposure to contaminants when swimming near stormwater or sewage outlets, especially after rainfall.
Margaret Pace Park, Miami, Florida
Margaret Pace Park provides sweeping views of Biscayne Bay near downtown Miami. Its waterfront paths, volleyball courts and urban skyline make it an attractive stop for residents and tourists.
The water tells a less inviting story. Surfrider found that 64 percent of the samples collected there exceeded Florida’s recreational water health standard.
Urban waterfronts collect pressure from dense development, roads, drainage systems, boats, wildlife and aging infrastructure. A destination can therefore remain visually appealing while experiencing bacterial pollution that visitors cannot see or smell.
Margaret Pace Park deserves a place on a Miami itinerary, but perhaps for the skyline, exercise paths and sunset rather than an impulsive swim. Checking local health notices before making contact with the bay remains the smartest approach.
The travel list nobody wants to need
America’s most concerning beach bacteria hot spots are scattered across famous vacation states, from Florida and California to Hawaii. Their presence challenges the comforting belief that expensive neighborhoods, tropical scenery or crowded shorelines must mean the water is clean.
Water quality also changes quickly. Rainfall, sewage failures, currents, tides and cleanup work can make conditions better or worse after an annual report appears. Heal the Bay recommends using current weekly grades and local advisories for real-time decisions because annual reports reveal patterns rather than the exact condition on a particular morning.
These beaches belong on a travel list for one important reason: travelers need to know where extra caution matters. Enjoy the scenery, support nearby businesses, and respect the communities working to solve these problems, but never step past a bacteria warning simply because the water looks irresistible.
