The Science Behind PFAS in Drinking Water: What You Need to Know
- Published:
- Updated: December 16, 2024
Summary
PFAS, or per- and polyfluoroalkyl substances, pose significant health risks due to their persistence in the environment and accumulation in the human body:
- Environmental Persistence: PFAS, known as "forever chemicals," resist degradation and contaminate drinking water from various sources.
- Health Impacts: Exposure to PFAS can disrupt hormones, weaken the immune system, and potentially increase the risk of cancer.
- Regulations and Mitigation: While regulations vary, testing water and using certified filtration systems can reduce exposure, along with advocating for stricter regulations and informed consumer choices.
Per- and polyfluoroalkyl substances, or PFAS, are chemical compounds that have been around since the mid-20th century. Since they’re heat-, water- and oil-resistant, PFAS have been used in every consumer product under the sun. From nonstick cookware to antibacterial fabrics and carpets, water repellent clothing and even some kinds of fire retardant foam. The availability of PFAS means that they are everywhere we find them.
Environmental Persistence of PFAS
PFAS are very stable, which is one of the things that sets them apart. They consist of carbon and fluorine atoms in long chains, so they are highly durable. This feature has given PFAS the title of "forever chemicals", since they stay in the environment for decades, without degrading. This persistence, combined with their widespread usage, has meant that these chemicals are found all over the world and in a large number of drinking water supplies.
PFAS Contamination in Drinking Water
The route PFAS can travel into drinking water isn’t the only one. Chemicals released into the air and water by factories producing or using PFAS. Firefighting foams made with PFAS, often used for military drills and airports, leach into groundwater. These chemicals can also be leached into soil and water from landfills that have PFAS-treated products. With these different potential sources, it is not surprising that PFAS in drinking water is an issue in many places around the world.
Absorption and Accumulation of PFAS in the Human Body
We can ingest PFAS-contaminated water, which has absorbed and accumulated in us. PFAS bind to proteins in blood and accumulate in organs. They’re chemically inert, and therefore not easily degraded or excreted, resulting in bioaccumulation. That’s because frequent PFAS exposure, even to very low levels, over time builds up in the body and can have health consequences.
What are the Health Impacts of PFAS Exposure?
Scientists have traced PFAS to all kinds of health outcomes. These include:
Hormone disturbance: PFAS can disrupt body’s natural hormone systems that could lead to disruptions in growth and development, reproduction and metabolism.
Immune system effects: PFAS has been found in some studies to impact the immune system, weakening the immunity against vaccinations and putting you at risk for disease.
Risks of cancer: There is some evidence that PFAS can cause some types of cancer, including kidney and testicular cancer.
More research will be required to make sense of these risks, but the current evidence is cause for alarm.
Current Research on PFAS and Health Risks
The scientific community is already conducting research on PFAS health effects. Newer research has only confirmed the association between PFAS and the immune system, and has started looking for associations with other conditions, including cardiovascular disease and diabetes. But research continues, and you’ll need to be on the cutting edge of new data to get the full picture of PFAS health impacts.
Regulations and Guidelines on PFAS in Drinking Water
Globally, the levels of PFAS permissible in water are not well defined or standardised. In the US, for two of the most researched PFAS, the Environmental Protection Agency has set a health advisory level, but this is not a legal limit. Several states have adopted higher thresholds, and there is still debate about whether they should have stronger regulations. In the rest of the world, regulatory thresholds for PFAS in drinking water are in place and some countries are still determining them. Whatever the exact norms, a lot is being said about how regulation is crucial for public health.
Methods to Reduce PFAS Exposure
In light of the health risks of PFAS, we should ask ourselves how we can avoid exposure. Here are some suggestions:
Tests and Filtration: Testing your drinking water frequently is the best start. If you do find PFAS, try to use a water filter that’s certified to filter out the chemicals.
Smart Consumer Decisions: Be on your guard for PFAS in consumer products. Avoid when you can, like stainless steel or cast iron instead of non-stick cookware and natural fibers for carpets and clothing.
Lobbying: Demand that PFAS be better regulated and deactivated, and that environmental impacts are better managed.
We should also know the science behind PFAS in water to keep ourselves and our communities safe from harm. If we keep abreast of the most current research and regulations and are practical in our efforts to limit exposure, then we can lessen the effects of these "deadly chemicals" on health and the environment.
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