10 Most Toxic Bodies of Water Around the World
Water bodies have always attracted people, whether for recreation, livelihood, or cultural significance. However, while many bodies of water offer beauty and relaxation, some harbor toxic secrets.
From industrial waste to natural disasters, certain bodies of water are notoriously dangerous.
Blue Lagoon (Buxton, England)

The Blue Lagoon in Buxton, England, may look like a serene, tropical oasis, but its crystal blue waters are anything but inviting. This former quarry has been flooded to form a lagoon, attracting visitors with its vibrant turquoise hue.
However, the allure of its appearance hides the dangerous chemicals that make the water toxic.
The water’s color is due to calcium oxide leaching from limestone rocks into the lagoon. With a pH comparable to that of ammonia, the water can cause severe skin and eye irritation, fungal infections, and stomach problems.
Lake Titicaca (Peru/Bolivia)
Lake Titicaca, nestled between Peru and Bolivia, is South America’s largest freshwater lake and holds deep cultural significance.
The ancient Incas believed it to be the birthplace of the Sun. However, this sacred site is now heavily polluted by industrial and human waste.
The water is contaminated with harmful heavy metals, such as arsenic and lead, mainly released by illegal factories in the region. In 2015, an alarming die-off of endangered Titicaca water frogs occurred, attributed to pollution in the lake.
Pinto Lake (California, USA)
Pinto Lake, located in Watsonville, California, is infamous for being one of the most toxic lakes in the United States. The lake’s toxicity stems from excessive algae blooms, caused by nitrogen and phosphorus in the water.
These blooms, dominated by cyanobacteria, produce microcystin, a potent toxin that can cause liver failure, nausea, and skin rashes.
The lake has been the site of numerous animal deaths, including birds, fish, and sea otters, all of which have been affected by the toxic blooms.
Buriganga River (Dhaka, Bangladesh)
The Buriganga River, flowing through Dhaka, the capital of Bangladesh, has become one of the most polluted rivers in the world.
This vital waterway is heavily polluted by industrial waste, particularly from tanneries in the Hazaribagh area, where toxic chemicals like chromium and lead are frequently dumped.
The river is also used as a dumping ground for domestic waste, including sewage. Fish have long disappeared from its waters, and the river’s toxic load poses significant health risks to the millions of people who rely on it for water, bathing, and even cooking.
Karymsky Lake (Kamchatka, Russia)

Karymsky Lake, located on Russia’s Kamchatka Peninsula, is known for its volcanic activity. The lake was formed in a caldera created by a volcanic eruption, and it remained dormant until a major eruption in 1996.
This eruption transformed the lake into one of the most acidic bodies of water on Earth.
The eruption deposited volcanic material into the lake, dramatically lowering its pH levels and making the water caustic. The lake’s water now has a pH level of just 3.2, making it one of the largest natural sources of acidic water in the world.
Matanza-Riachuelo River (Buenos Aires, Argentina)
The Matanza-Riachuelo River in Buenos Aires is one of the world’s most polluted rivers, largely due to industrial and domestic waste. The river has become a dumping ground for tannery waste, chemical plants, and sewage, leading to widespread contamination.
The toxic mix of heavy metals, pesticides, and untreated waste has made the river hazardous to both human health and the environment. Local communities, particularly those living in informal settlements near the river, are exposed to severe health risks.
Berkeley Pit (Montana, USA)
Located in Butte, Montana, the Berkeley Pit is a toxic body of water formed by mining activity.
The pit is filled with water contaminated by metals such as arsenic, cadmium, and copper, as well as sulfuric acid, which leaches into the water from surrounding mining waste.
The pit became infamous in 1995 when over 300 snow geese died after landing in the water. In 2016, another mass death occurred, with thousands of geese succumbing to the toxic water.
Yamuna River (Delhi, India)
The Yamuna River, once a pristine waterway, now faces severe pollution as it flows through Delhi.
While the river starts as clear water from the Himalayas, by the time it reaches Delhi, it is heavily contaminated by untreated sewage, industrial waste, and toxic chemicals.
The river is contaminated with an overwhelming amount of fecal coliform bacteria, far exceeding safe levels for human contact. This pollution has resulted in the complete absence of aquatic life for miles along the river.
Lake Natron (Tanzania)
Lake Natron, located in northern Tanzania, is a highly alkaline saltwater lake known for its extreme conditions.
The lake’s water has a pH range of 9 to 10.5, making it highly corrosive to most life forms. Additionally, the lake’s temperature can soar to over 60°C (140°F).
Due to its chemical composition, animals that fall into Lake Natron, such as birds and bats, are often preserved in a mummified state. The lake’s waters have a strong reflection that confuses birds, causing them to crash into the water and die.
Dead Sea (Jordan, Israel, Palestine)

The Dead Sea, located between Jordan, Israel, and Palestine, is famous for its high salinity and mineral content.
However, the very qualities that make it unique also make it dangerous for aquatic life. While the lake is not entirely devoid of life, its extreme salinity prevents most organisms from surviving in it.
The mineral-rich waters are beneficial for human skin, but prolonged exposure can lead to dehydration and skin irritation.
Conclusion
These 10 bodies of water serve as stark reminders of how human activities, industrial practices, and natural events can transform once-thriving ecosystems into dangerous, life-threatening environments.
It is crucial to continue addressing the pollution and hazardous waste that contribute to these toxic water bodies to protect both the environment and public health.
