(The Pak Global Pakistan) – New scientific research has revealed that salt present in drinking water may pose a serious risk to heart health, challenging the long-held belief that water is always neutral and harmless.
A large international study has found a clear association between saline drinking water and increased blood pressure, along with a higher risk of developing hypertension. The impact is particularly significant in coastal regions, where underground freshwater supplies are increasingly contaminated by seawater intrusion.
Experts say climate change and rising sea levels are accelerating this process, allowing salt to seep into groundwater sources that millions of people rely on for daily drinking.
The findings are based on a comprehensive analysis led by Rajiv Chowdhury, Chair of the Department of Global Health at Florida International University. The research team reviewed data from 27 population-based studies involving more than 74,000 participants across the United States, Bangladesh, Vietnam, Kenya, Australia, Israel, and several European nations.
Many of the studies focused on coastal communities, where saline groundwater is commonly used for drinking purposes.
Blood pressure, which measures the force of blood against artery walls, is a major indicator of cardiovascular health. Persistently high blood pressure increases the risk of heart disease, stroke, and kidney damage.
According to the analysis, individuals consuming saltier drinking water showed an average increase of 3.2 mm Hg in systolic blood pressure and nearly 2.8 mm Hg in diastolic pressure. The study also reported a 26 percent higher risk of hypertension among populations exposed to elevated water salinity, with coastal residents experiencing the most consistent effects.
“These increases may seem small at the individual level,” Chowdhury explained, “but when entire populations are exposed, even modest rises in blood pressure can translate into major public health consequences.”
He added that the risk linked to salty water is comparable to other established cardiovascular risk factors, such as low physical activity, which raises hypertension risk by 15 to 25 percent.
Scientists believe the connection stems from sodium’s role in regulating blood volume and vessel tension. Excess sodium causes the body to retain more water, increasing blood volume and resistance within blood vessels, ultimately driving blood pressure higher.
The study highlights the growing need for safe drinking water solutions, especially in coastal areas facing the combined threats of climate change and rising sea levels.

