Swimming in Costa Rica is generally safe if you choose the right beaches and take basic precautions, but the risks are real and worth understanding before you go. Drowning is the leading cause of unintentional death among international visitors to the country, with an average of 50 fatal drownings per year on Costa Rican beaches between 2002 and 2012. Most of these deaths involve rip currents, and most happen at beaches with no lifeguards on duty.
Rip Currents Are the Biggest Danger
Costa Rica’s Pacific coast produces powerful rip currents that catch visitors off guard. Between 2001 and 2019, 936 people died from drowning along the country’s coastline. The beaches around Jacó and Parrita on the Central Pacific coast carry the highest drowning toll for both locals and tourists. These beaches are especially dangerous because they’re popular (close to San José), prone to strong rip currents, and understaffed with lifeguards.
Rip currents are channels of water flowing away from shore. They don’t pull you under, but they pull you out. If you get caught in one, swim parallel to the beach until you’re out of the current, then head back to shore. Fighting directly against the current is what leads to exhaustion and drowning. Look for uneven, choppy water or a visible channel of discolored water flowing seaward before you get in.
Most Beaches Have No Lifeguards
The U.S. State Department warns that most Costa Rican beaches lack lifeguards or posted warnings about unsafe conditions. Only a handful of beaches have any lifeguard presence at all, and even those stations may not be staffed, may be spread far apart, or may have limited equipment and visibility.
The beaches with some level of lifeguard coverage include:
- Pacific Coast: Manuel Antonio, Caldera, Esterillos Oeste, Bahía Ballena, Ventanas, and Tamarindo
- Caribbean Coast: Cocles, Manzanillo, Negra (Limón), and Punta Uva
If swimming safety is a priority, choosing one of these beaches gives you a meaningful advantage. But don’t assume a lifeguard will be on duty when you arrive. Treat every swim as though you’re on your own, and never swim alone.
Crocodiles Near River Mouths
American crocodiles live throughout Costa Rica’s Pacific lowlands, and they regularly show up in the ocean near river mouths and estuaries where fresh and salt water mix. This isn’t a rare or theoretical risk. A December 2025 video captured a crocodile swimming in the surf at Jacó, close to shore.
Tamarindo is one of the most talked-about spots. The beach’s estuary draws crocodiles that swim out into the ocean, and they cross between Tamarindo and neighboring Playa Grande using ocean currents. Nosara, Boca Barranca, and several remote southern beaches like Agujas and Bejuco have also recorded sightings. Costa Rica’s Ministry of Environment advises against swimming or surfing near river mouths, which is the single most useful rule to follow. If a river or estuary empties into the ocean near where you plan to swim, move to a different stretch of beach.
Freshwater Carries Its Own Risks
Waterfalls, rivers, and hot springs are a big part of the Costa Rica experience, but freshwater comes with bacterial and parasitic risks that the ocean typically doesn’t.
Leptospirosis is the main concern. It’s a bacterial infection spread through water contaminated with animal urine, and it’s endemic in Costa Rica. A well-documented outbreak among white-water rafters in 1996 showed that swallowing river water and being submerged after falling in were the two strongest risk factors. Symptoms include fever, chills, severe headache, and muscle pain, usually appearing within one to two weeks. Most cases resolve, but severe infections can cause kidney failure and internal bleeding. Flooding increases the risk significantly, so avoid river swimming after heavy rains.
Hot springs pose a different concern. Warm freshwater is the natural habitat for amoebas that can cause a brain infection called primary amebic meningoencephalitis, which is nearly always fatal. The infection happens when water is forced up the nose. The CDC’s guidance is straightforward: keep your head above water in hot springs and naturally heated pools. Don’t submerge, don’t jump in, and consider using a nose clip if you’re worried.
Water Quality Changes With the Seasons
Costa Rica’s rainy season runs roughly from May through November, and it has a measurable effect on ocean water quality. A study of a wastewater-impacted beach found that bacterial levels exceeded safe swimming standards 26% to 54% of the time during the rainy season, compared to 0% to 38% during the dry season. Rainfall washes contaminants from rivers, sewage systems, and agricultural land into the ocean.
The pattern is consistent: more rain means more bacteria in the water, particularly near river mouths and urban areas. After a heavy downpour, it’s smart to wait at least 24 to 48 hours before swimming at beaches near towns or river outlets. Remote beaches far from development tend to have better water quality year-round.
Costa Rica runs a national beach rating system called the Bandera Azul Ecológica, or Ecological Blue Flag. Beaches earn one to five stars based on water testing, safety infrastructure, and environmental management. A record 118 beaches have earned the designation. The top-rated five-star beaches include Playa Matapalo and Punta el Madero in northern Guanacaste, Playa Carrillo in southern Guanacaste, and Playa Blanca and Playitas on the Central Pacific. Choosing a Blue Flag beach means the water is regularly tested and basic safety infrastructure is in place.
Practical Rules for Safer Swimming
Most of the risk in Costa Rican waters is avoidable with a few habits. Swim at beaches with lifeguards when possible, especially on the Pacific side where rip currents are strongest. Stay well away from river mouths, both for water quality and crocodile avoidance. Never swim alone, and don’t go in past your waist if you’re not a strong swimmer or if conditions look rough.
Watch what locals do. If a beach is empty on a hot day, there’s often a reason. Ask at your hotel or a local surf shop about current conditions before heading out. If you’re visiting during the rainy season, give the ocean a day to clear after storms and stick to beaches away from river runoff. For freshwater, keep your head above the surface in hot springs and avoid swallowing river water during any activity.
Costa Rica’s emergency number is 911, but response times in remote coastal areas can be long. Carry basic first aid supplies and know where the nearest clinic is before you head to the beach. Cell service can be spotty at more isolated stretches of coast.