Residents in coastal areas face a hidden health risk from their drinking water, as new research links salty tap water to higher blood pressure and increased hypertension risk.
A comprehensive review of 27 studies involving more than 74,000 participants across multiple countries found that consuming water with elevated sodium levels is associated with a 26 percent increase in hypertension risk. The analysis, led by Rajiv Chowdhury and his team, showed that individuals exposed to higher-sodium drinking water had systolic blood pressure readings averaging 3.22 mmHg higher and diastolic pressure 2.82 mmHg higher than those with lower exposure.
While these individual changes may seem modest, researchers noted that widespread, long-term exposure across communities can amplify cardiovascular risks over time. The connection between saline drinking water and elevated blood pressure was particularly strong in coastal regions, where seawater intrusion into freshwater aquifers naturally increases sodium levels in local water supplies.
The findings highlight an often-overlooked source of daily sodium intake. While public health messages typically focus on reducing salt in food, drinking water can contribute significantly to total sodium consumption — especially in areas affected by geological or environmental factors that increase mineral content.
Experts suggest that monitoring water quality for salinity, particularly in vulnerable coastal communities, could become an important part of hypertension prevention strategies. The study included data from the United States, Australia, Israel, Bangladesh, Vietnam, Kenya, and several European nations, demonstrating that this is not an isolated regional issue but a potential public health concern in various parts of the world where freshwater sources interact with seawater.
As climate change and overuse of groundwater alter hydrological patterns, the risk of saltwater intrusion may grow, making awareness of water-borne sodium increasingly relevant for both individuals and public health officials managing community water systems.
