Understanding PFAS: A Look at the Awareness and Impact on U.S. Drinking Water

Water poured into a clear glass.
Water poured into a clear glass.

The presence of per- and polyfluoroalkyl substances (PFAS) in U.S. drinking water has emerged as a critical environmental and public health issue. Despite increasing media coverage and governmental attention, a significant gap exists in the general public’s understanding of PFAS. An exploratory study by Texas A&M AgriLife scientists and published in PLoS ONE, aimed to bridge this gap by assessing public awareness regarding PFAS and their potential impact on community health and drinking water.

Key Findings of the Nationwide Survey

  • Limited Public Awareness: Alarmingly, nearly half of the respondents (45.1%) were unfamiliar with PFAS. Additionally, 31.6% had heard of PFAS but lacked an understanding of what it entails.
     
  • Perception of Drinking Water Safety: A striking 97.4% did not believe their drinking water was affected by PFAS, indicating a disconnect between public perception and environmental realities.
     
  • Community Exposure as a Predictor: Awareness due to known community exposure emerged as the strongest predictor of PFAS awareness. Those aware of community exposure were more informed about PFAS sources and likely to change their product usage habits.

PFAS: An Overview

PFAS, often termed “forever chemicals” due to their persistence in the environment and in our bodies, are resistant to water, grease, and heat and found in a range of everyday products including food packaging, clothing, cosmetics, and toilet paper. PFAS have been widely used in various industrial processes and consumer products since the 1940s. Their presence in products ranging from non-stick cookware to fire extinguishing foams raises significant environmental concerns, particularly in water sources. The resistance of PFAS to degradation leads to bioaccumulation, posing serious health risks such as cancer, hormone disruption, liver damage, weakened immune systems, and reproductive harm.

Regulatory Response and Public Health Implications

The U.S. Environmental Protection Agency (EPA) has recently proposed stricter regulations to limit PFAS in drinking water, reducing the maximum contaminant levels from 70 parts per trillion (ppt) to 4 ppt. This move, coupled with significant financial settlements from major corporations for PFAS clean-up, highlights the urgency of addressing PFAS contamination. However, the public’s limited awareness and understanding hinder effective response and mitigation efforts.

The Gap in Public Perception and Knowledge

The importance of knowing about PFAS lies in the need to understand the potential health risks associated with exposure to these substances. The general public’s awareness and knowledge of PFAS have been found to be limited, with only about half of the respondents in a nationwide survey stating they were aware of PFAS as an environmental contaminant. This study underscores a critical gap in public awareness and understanding of PFAS. This lack of awareness extends to the potential contamination of their primary drinking water sources.

Community exposure was identified as the strongest predicting factor regarding the level of public knowledge and awareness of PFAS and its sources. Therefore, it is crucial to provide accurate, real-time data on PFAS exposure to empower consumers to make informed decisions and take necessary precautions. Additionally, clear labeling of PFAS products is essential to allow consumers to be aware of their exposure frequency and make adjustments in product use as desired.

The Role of Effective Communication

Government agencies, research organizations, universities, utilities, and scientific institutions must collaborate to provide clear, accessible, and actionable information about PFAS, their sources, and health implications. This effort should aim to make the information relevant and understandable to the general public, encouraging informed decision-making and behavioral changes to reduce PFAS exposure. Manufacturers should clearly label their products with the presence of PFAS. This transparency allows consumers to be aware of their exposure frequency and make adjustments in product use. Consumers may want to install point-of-use treatment devices, such as under-sink or countertop filters, in their homes to remove PFAS from drinking water. These devices often use activated carbon or reverse osmosis technology to effectively reduce PFAS levels.


Source: Berthold TA, McCrary A, deVilleneuve S, Schramm M (2023) Let’s talk about PFAS: Inconsistent public awareness about PFAS and its sources in the United States. PLoS ONE 18(11): e0294134.

Join the global movement: Combat plastic pollution this World Environment Day, June 5th

Theme:Finding solutions to plastic pollution
Date:June 5th, 2023
Host:Côte d’Ivoire in collaboration with the Netherlands
Hashtags:#BeatPlasticPollution and #WorldEnvironmentDay

June 5th, 2023, will mark the 50th anniversary of World Environment Day, which was established by the United Nations Environment Programme (UNEP) in 1973. This year, the event is anticipated to attract tens of millions of participants both online and through in-person activities, embodying the spirit of environmental advocacy.

Addressing plastic pollution

This year’s theme is focused on finding solutions to plastic pollution. The occasion underscores the consequences of actions and inaction taken by individuals, businesses, and governments in response to plastic pollution. It also highlights the pressing need to amplify these efforts and transition towards a circular economy. To assist in these efforts, a Beat Plastic Pollution Practical Guide is available, outlining steps to halt and reverse the detrimental effects of plastic pollution.

An urgent need

Our planet is in crisis, besieged by the overwhelming weight of plastic waste. Despite its numerous applications, plastic has become detrimental due to our dependence on single-use plastic products, which cause significant environmental and health issues.

As per the UN, globally, one million plastic bottles are bought every minute, up to five trillion plastic bags are used each year, and 400 million tonnes of plastic waste are produced annually. Approximately 36% of all plastic is used for packaging, including single-use items for food and beverage containers. Sadly, around 85% of these items end up in landfills or as unregulated waste. Less than 10% of the seven billion tonnes of plastic waste generated worldwide has been recycled. The most prevalent types of plastic waste found in the environment include cigarette butts, food wrappers, plastic bottles and caps, grocery bags, straws, and stirrers.

Environmental harm

Plastic waste can persist in the environment for centuries due to its durability and resistance to degradation. Nearly all single-use plastic products are manufactured from fossil fuels, contributing to the escalation of greenhouse gas emissions. Most plastic items merely break down into smaller microplastics, which can infiltrate the human body and accumulate in various organs. The impact of this phenomenon on human health remains largely unknown. Microplastics are now ubiquitous and are a part of the Earth’s fossil record. They have even led to the creation of a new marine microbial habitat, known as the “plastisphere.”

How you can help

Urge your local and national leaders to take decisive action by eliminating problematic plastic packaging, redesigning products for sustainability, and promoting transparency in sustainability information. Additionally, you can participate in beach or river clean-ups, shop sustainably, adopt a zero-waste lifestyle, advocate for change, choose sustainable fashion, and opt for plastic-free personal care products.

Spread awareness and inspire others via social media using the hashtags #BeatPlasticPollution and #WorldEnvironmentDay.

Are gas stoves bad for your health? Here’s why the federal government is considering new safety regulations

Gas stove. Photo by Andrea Piacquadio.
Gas stove. Photo by Andrea Piacquadio.

By Jonathan Levy, The Conversation

Cooks love their gadgets, from countertop slow cookers to instant-read thermometers. Now, there’s increasing interest in magnetic induction cooktops – surfaces that cook much faster than conventional stoves, without igniting a flame or heating an electric coil.

Some of this attention is overdue: Induction has long been popular in Europe and Asia, and it is more energy-efficient than standard stoves. But recent studies have also raised concerns about indoor air emissions from gas stoves.

Academic researchers and agencies such as the California Air Resources Board have reported that gas stoves can release hazardous air pollutants while they’re operating, and even when they’re turned off. A 2022 study by U.S. and Australian researchers estimates that nearly 13% of current childhood asthma cases in the U.S. are attributable to gas stove use.

Dozens of U.S. cities have adopted or are considering regulations that bar natural gas hookups in new-construction homes after specified dates to speed a transition away from fossil fuels. At the same time, at least 20 states have adopted laws or regulations that prohibit bans on natural gas.

On Jan. 9, 2023, the U.S. Consumer Product Safety Commission announced that it will consider measures to regulate hazardous emissions from gas stoves. The agency has not proposed specific steps yet, and said that any regulation will “involve a lengthy process.” On Jan. 11, CPSC Chair Alexander Hoehn-Saric further clarified that the agency was looking for ways to reduce indoor air quality hazards, but did not plan to ban gas stoves.

As an environmental health researcher who does work on housing and indoor air, I have participated in studies that measured air pollution in homes and built models to predict how indoor sources would contribute to air pollution in different home types. Here is some perspective on how gas stoves can contribute to indoor air pollution, and whether you should consider shifting away from gas.

Natural gas has long been marketed as a clean fuel, but research on its health and environmental effects is calling that idea into question.

Respiratory effects

One of the main air pollutants commonly associated with using gas stoves is nitrogen dioxide, or NO₂, which is a byproduct of fuel combustion. Nitrogen dioxide exposures in homes have been associated with more severe asthma and increased use of rescue inhalers in children. This gas can also affect asthmatic adults, and it contributes to both the development and exacerbation of chronic obstructive pulmonary disease.

Nitrogen dioxide in homes comes both from outdoor air that infiltrates indoors and from indoor sources. Road traffic is the most significant outdoor source; unsurprisingly, levels are higher close to major roadways. Gas stoves often are the most substantial indoor source, with a greater contribution from large burners that run longer.

The gas industry’s position is that gas stoves are a minor source of indoor air pollutants. This is true in some homes, especially with respect to exposures averaged over months or years.

But there are many homes in which gas stoves contribute more to indoor nitrogen dioxide levels than pollution from outdoor sources does, especially for short-term “peak” exposures during cooking time. For example, a study in Southern California showed that around half of homes exceeded a health standard based on the highest hour of nitrogen dioxide concentrations, almost entirely because of indoor emissions.

How can one gas stove contribute more to your exposure than an entire highway full of vehicles? The answer is that outdoor pollution disperses over a large area, while indoor pollution concentrates in a small space.

Ventilation is an essential tool for improving indoor air quality in homes.

How much indoor pollution you get from a gas stove is affected by the structure of your home, which means that indoor environmental exposures to NO₂ are higher for some people than for others. People who live in larger homes, have working range hoods that vent to the outdoors and have well-ventilated homes in general will be less exposed than those in smaller homes with poorer ventilation.

But even larger homes can be affected by gas stove usage, especially since the air in the kitchen does not immediately mix with cleaner air elsewhere in the home. Using a range hood when cooking, or other ventilation strategies such as opening kitchen windows, can bring down concentrations dramatically.

Methane and hazardous air pollutants

Nitrogen dioxide is not the only pollutant of concern from gas stoves. Some pollution with potential impacts on human health and Earth’s climate occurs when stoves aren’t even running.

A 2022 study estimated that U.S. gas stoves not in use emit methane – a colorless, odorless gas that is the main component of natural gas – at a level that traps as much heat in the atmosphere as about 400,000 cars.

Some of these leaks can go undetected. Although gas distributors add an odorant to natural gas to ensure that people will smell leaks before there is an explosion risk, the smell may not be strong enough for residents to notice small leaks.

Some people also have a much stronger sense of smell than others. In particular, those who have lost their sense of smell – whether from COVID-19 or other causes – may not smell even large leaks. One recent study found that 5% of homes had leaks that owners had not detected that were large enough to require repair.

This same study showed that leaking natural gas contained multiple hazardous air pollutants, including benzene, a cancer-causing agent. While measured concentrations of benzene did not reach health thresholds of concern, the presence of these hazardous air pollutants could be problematic in homes with substantial leaks and poor ventilation.

Methane leaks from natural gas at all stages of production and use. UC Santa Barbara, CC BY-ND
Methane leaks from natural gas at all stages of production and use. UC Santa Barbara, CC BY-ND

Reasons to switch: Health and climate

So, if you live in a home with a gas stove, what should you do and when should you worry? First, do what you can to improve ventilation, such as running a range hood that vents to the outdoors and opening kitchen windows while cooking. This will help, but it won’t eliminate exposures, especially for household members who are in the kitchen while cooking takes place.

If you live in a smaller home or one with a smaller closed kitchen, and if someone in your home has a respiratory disease like asthma or chronic obstructive pulmonary disease, exposures may still be concerning even with good ventilation. Swapping out a gas stove for one that uses magnetic induction would eliminate this exposure while also providing climate benefits.

There are multiple incentive programs to support gas stove changeovers, given their importance for slowing climate change. For example, the recently signed Inflation Reduction Act of 2022, which includes many provisions to address climate change, offers rebates for the purchase of high-efficiency electric appliances such as stoves.

Moving away from gas stoves is especially important if you are investing in home energy efficiency measures, whether you are doing it to take advantage of incentives, reduce energy costs or shrink your carbon footprint. Some weatherization steps can reduce air leakage to the outdoors, which in turn can increase indoor air pollution concentrations if residents don’t also improve kitchen ventilation.

In my view, even if you’re not driven to reduce your carbon footprint – or you’re just seeking ways to cook pasta faster – the opportunity to have cleaner air inside your home may be a strong motivator to make the switch.

This article has been updated to reflect the Jan. 11, 2023 statement from the Consumer Product Safety Commission that the agency has no plans to ban gas stoves.