Water Quality·June 8, 2026·5 min read

PFAS: The Forever Chemicals in the World's Groundwater

A class of synthetic compounds is now found in rivers, aquifers, and municipal supplies across the planet. Here is why they persist, how they move, and what removal actually requires.

Editorial · not medical advice

Per and polyfluoroalkyl substances, known as PFAS, have become one of the most studied threats to groundwater and drinking water worldwide. They are often called forever chemicals because they resist the natural processes that break down most other compounds.

PFAS are persistent. They are mobile. They turn up in places far from where they were first released. That combination is what makes them a distinct problem in both environmental science and public health.

What PFAS Are

PFAS are a family of thousands of synthetic compounds first manufactured in the 1940s for industrial and consumer use. Their defining feature is the carbon fluorine bond, one of the strongest bonds in organic chemistry. That bond gives PFAS molecules high resistance to heat, water, oil, and chemical breakdown.

Common uses include nonstick cookware coatings, water and stain resistant textiles, grease resistant food packaging, firefighting foams, and industrial processes that depend on chemical stability. The same properties that make PFAS useful in manufacturing are the properties that make them difficult to remove from the environment. Once released, they can persist for decades in soil, sediment, and water.

How They Reach Groundwater

PFAS enter groundwater through several pathways. Industrial discharge from chemical plants, manufacturing sites, and metal finishing operations releases PFAS into rivers and aquifers. Landfills contribute through leachate, which carries PFAS from discarded products into soils and then into groundwater.

Firefighting foams used at airports, military sites, and industrial facilities introduce concentrated amounts directly into the ground. In farming regions, biosolids from treated sewage sludge can carry PFAS into soils and wells. Because PFAS do not bind strongly to soil, they travel long distances from their source and contaminate supplies across wide areas.

Conventional treatment such as chlorination, filtration, and sedimentation does little to remove PFAS from water.

Why They Matter for Health

PFAS draw scrutiny because they are persistent, mobile, and able to accumulate in living tissue. Compounds such as PFOA and PFOS have been shown to build up in the blood, liver, and kidneys over time.

Research has associated long term exposure with a range of outcomes studied by health agencies, including effects on liver function, thyroid function, immune response, cholesterol levels, and developmental measures in infants and children. Much of the concern centers on chronic exposure at low concentrations, where effects are difficult to detect early but accumulate over years.

The Scale of Exposure

PFAS contamination is a global concern because many communities draw drinking water from wells and aquifers. Once present in an aquifer, PFAS can remain for decades without natural breakdown, and their mobility lets them spread far from the original site.

Studies in the United States have estimated that a large share of the population may be served by water containing detectable PFAS, and similar contamination has been documented in Europe, Asia, and Australia.

What Removal Requires

Addressing PFAS calls for a combination of treatment, monitoring, and policy. Three treatment methods have shown measurable results in reducing PFAS in drinking water:

Activated carbon adsorption
Ion exchange resins
High pressure reverse osmosis

Prevention matters as much as treatment. Limiting industrial discharge, phasing out legacy PFAS compounds, and regulating firefighting foams reduce new contamination at the source. Ongoing testing using accredited laboratory methods is how contamination gets identified in the first place, and how the public learns whether a given water source is affected.

What you cannot measure, you cannot manage. With PFAS, the testing method and its detection limit are the whole story.

Why Testing Is the Real Answer

PFAS are not visible, and they do not change the taste or clarity of water. The only way to know whether they are present is to test for them with a method sensitive enough to detect them at very low concentrations. A water source is only as trustworthy as the lab data behind it.

This is the standard we hold our own water to.

Where Unbelievable Water Stands

Unbelievable Water is natural mineral water sourced 510 meters below the surface off Sokcho, South Korea, in the East Sea. We test for PFAS rather than ask you to assume.

Result: No PFAS detected across the tested compounds. Lab: Eurofins Eaton Analytical (Pomona, CA), IBWA bottled water PFAS panel, 500 mL. Report: Job No. 380-188240-1.

The full panel and certificate are on the Certifications page.

PFAS sit apart from many other pollutants. Heavy metals can settle into sediment. Many organic compounds biodegrade. PFAS stay mobile, persistent, and present in water systems for decades. Remediation is costly and technically demanding, which is why prevention and transparent testing matter so much.

Protecting groundwater from PFAS is a long term effort shared by communities, industry, and regulators. For anyone choosing what to drink, the question worth asking is simple. Has the water been tested, by what method, and to what detection limit.