PFAS in Drinking Water: A Complete Homeowner's Guide

Most of us assume that if drinking water looks clean, it probably is.

Clear water inspires confidence.

Yet some contaminants don't leave behind obvious clues, and PFAS are among the best-known examples. They usually can't be identified by sight, taste, or smell, which is one reason they've become an increasingly important topic in discussions about drinking water across the United States.

Often called "forever chemicals," PFAS (per- and polyfluoroalkyl substances) are a large family of synthetic compounds valued for their resistance to heat, water, oil, and grease. The same properties make many PFAS difficult to break down in the environment and have led to more research and monitoring of drinking water sources.

If you've recently heard about PFAS, you're probably wondering a few practical questions. Is your local water affected? Should you have it tested? And what options are available if PFAS are detected?

This guide answers those questions in straightforward language. You'll learn how PFAS reach drinking water, what current research says, how recent regulations affect homeowners, and the practical steps you can take to understand your local water quality better.

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PFAS Didn't Become a Concern Overnight

Ten years ago, not many people knew what the term PFAS meant. You can now more often hear it in your local media, see it in the annual Consumer Confidence Reports, and hear about it in the latest updates on the City water system.

That change doesn't necessarily mean these compounds have suddenly appeared in drinking water.

In many communities, the increased attention reflects advances in laboratory testing, years of scientific research, and updated federal regulations that require broader monitoring. Scientists can now detect certain PFAS at much lower concentrations than was possible in the past, giving researchers and water utilities a clearer understanding of where these compounds occur and how they move through the environment.

The result is more information, not necessarily more contamination.

That's an important distinction, especially when headlines can make the issue seem more widespread than it actually is.

Built to Last Longer Than Anyone Expected

PFAS weren't created for drinking water. They were created because manufacturers needed materials that could withstand demanding conditions without breaking down.

Beginning in the 1940s, these compounds became valuable in applications requiring resistance to heat, moisture, oils, and grease. Over time, they found their way into a wide variety of consumer and industrial products, including food packaging, stain-resistant fabrics, water-resistant clothing, specialized manufacturing processes, and certain firefighting foams.

For years, those qualities were viewed almost entirely as benefits.

Today, they're also the reason PFAS continue to attract scientific attention.

Unlike many manufactured chemicals that gradually degrade after entering the environment, PFAS remain remarkably stable. Some can persist for years in soil, groundwater, rivers, lakes, and sediments, giving them opportunities to move beyond the locations where they were originally used.

That's where the nickname "forever chemicals" comes from.

It's not a scientific classification. Rather, it's a practical way of describing how slowly many PFAS compounds break down under natural environmental conditions.

One point is worth clarifying here.

PFAS isn't a single chemical.

Illustration showing that PFAS refers to a family of different chemical compounds.

It's a family that includes thousands of related compounds. While they share similar characteristics, each behaves somewhat differently and has been studied to varying degrees. Among those most frequently referenced in drinking water research and federal regulations are:

PFOA (Perfluorooctanoic Acid)
PFOS (Perfluorooctane Sulfonate)
PFHxS (Perfluorohexane Sulfonic Acid)
PFNA (Perfluorononanoic Acid)
HFPO-DA (GenX Chemicals)

Some of the older PFAS used in the manufacturing process have been replaced or significantly reduced in use in the U.S., and newer replacement compounds are still being assessed as more information is available.

How PFAS Become Part of the Drinking Water Conversation

Illustration showing common environmental pathways through which PFAS may enter groundwater and public water sources.

PFAS were not designed to be in drinking water. They entered the dialogue over the years because they were so common.

PFAS have been slowly released into the environment through manufacturing processes, past disposal practices, and the use of products containing these chemicals. In a few places, they spread farther from their place of origin due to precipitation, groundwater flow, and surface water movement.

Potential sources that have received attention include:

industrial manufacturing facilities
airports
firefighter training locations
landfills
wastewater treatment facilities
contaminated groundwater
surface water used for public drinking water supplies

Every community is different.

The presence of PFAS in one city's water system doesn't automatically indicate similar conditions elsewhere. Local geology, historical land use, industrial activity, and water sources all influence what may be detected in a particular area.

That's why community-specific information is almost always more valuable than broad national headlines.

What the Research Means for Homeowners

Scientific understanding of PFAS has changed considerably over the past two decades. As testing methods have become more sensitive, researchers have been able to detect these compounds at much lower concentrations than was previously possible. Long-term studies have also provided a clearer picture of how certain PFAS behave in the environment and how people may be exposed over time.

That growing body of evidence has shaped recommendations from public health agencies and influenced newer drinking water regulations.

According to the U.S. Environmental Protection Agency (EPA), long-term exposure to certain PFAS has been associated with a range of potential health effects. Research involving some of the best-studied compounds has examined possible associations with:

changes in cholesterol levels
effects on the liver
changes in immune system function
reduced response to certain vaccines
developmental effects during pregnancy and childhood
an increased risk of certain cancers associated with some PFAS compounds

One detail is easy to overlook.

In scientific research, associations are often discovered rather than definitive evidence of cause and effect for any particular health condition in each person. Researchers study large numbers of people over long periods of time, taking into consideration many environmental and lifestyle factors. Health guidance and regulatory recommendations are continually evolving as more evidence emerges.

That isn't unusual.

It's how science is supposed to work.

Why New EPA Standards Matter

Public awareness of PFAS increased significantly in 2024 when the U.S. Environmental Protection Agency finalized the nation's first enforceable drinking water standards for several PFAS compounds under the National Primary Drinking Water Regulations.

The rule established Maximum Contaminant Levels (MCLs) for several well-studied PFAS, including:

PFOA
PFOS
PFHxS
PFNA
HFPO-DA (GenX Chemicals)

It also established new monitoring requirements for public water systems and corrective actions if federal standards are being violated.

It's easy for most residents to see. Water providers are now making public information about their water quality results available, such as through annual Consumer Confidence Reports, creating more opportunities for community access to local information.

The more testing that's performed, the more instances of PFAS contamination may go undetected. It is not necessarily a change in water quality, but may be because of expanded monitoring and better reporting.

Start With Your Own Water

Laboratory technician preparing drinking water samples for professional PFAS testing.

When people first learn about PFAS, it's tempting to search for a universal answer.

There isn't one.

Water quality varies from one community to the next, and sometimes even between neighboring water systems. Local water sources, geology, historical industrial activity, and treatment practices all play a role.

That's why the most useful place to begin isn't with a product or a laboratory test.

It's with the information already available about your local water.

If a public water system serves your home, start by reviewing the latest Consumer Confidence Report or any PFAS monitoring updates published by your utility. These reports summarize what has been monitored, explain how results compare with federal standards, and often answer many of the questions people have before additional testing becomes necessary.

There is an alternate method if you have a private well because a public utility does not provide periodic testing. A review of local environmental information and/or a certified laboratory consultation can help determine whether household testing is warranted.

The goal isn't to test simply because PFAS has appeared in the news.

It's to make decisions based on reliable information that's relevant to your own water supply.

When Does Filtration Make Sense?

After reviewing local water information, people generally find themselves in one of three situations.

Some are comfortable continuing to monitor their annual water quality reports.

Others choose laboratory testing to gain a more detailed understanding of their household water.

Many decide that adding a point-of-use filtration system fits their long-term preferences, particularly if they want an additional way to help address common drinking water contaminants.

There is no one right or wrong approach.

This will be specific to your water quality condition, your household's water requirements, and your expectations for the quality of water you use every day.

If you've reached the point where you want an additional layer of confidence in your drinking water, the next step is deciding which type of filtration system best fits your household.

Choosing a Countertop Gravity-Fed Filtration System

No single filtration system fits every home. The decision is based on kitchen space, daily water use, maintenance preferences, and the kind of contaminants you are looking to target.

Even though there is no permanent plumbing or electricity involved, countertop gravity-driven systems are still a popular option. They're also convenient to relocate so they fit the bill in apartments, rental properties, and homes where mobility is a priority.

For households considering a stainless steel gravity-fed system, Berkey® offers several models designed for everyday household use.

When equipped with Black Berkey® Elements, Berkey® systems are designed to help address many common contaminants found in drinking water—including PFAS, chlorine, heavy metals, volatile organic compounds (VOCs), pharmaceuticals, and pesticides—while helping improve the taste and odor of drinking water while leaving naturally occurring beneficial minerals in the water.

It's important to consider the overall quality of your household drinking water needs, not just a single contaminant, when choosing a system. The ideal option is easy to incorporate into your lifestyle and will help meet the water quality issues that are most important to you.

Which Berkey® System Is Right for You?

Performance is only one consideration when choosing a filtration system.

Capacity matters as much.

A system that's too small may need frequent refilling, while one that's significantly larger than your household requires may take up more counter space than necessary.

Here's a general guide to the Berkey® lineup:

System	Capacity	Best For	Product
Travel Berkey®	1.5 Gallons	Singles & Couples	View Product
Big Berkey®	2.25 Gallons	Most Families	View Product
Royal Berkey®	3.25 Gallons	Larger Families	View Product
Imperial Berkey®	4.5 Gallons	High Daily Water Use	View Product
Crown Berkey®	6 Gallons	Large Households & Offices	View Product

Frequently Asked Questions

What does PFAS stand for?

PFAS stands for per- and polyfluoroalkyl substances, a large family of synthetic chemicals that have been used in manufacturing and consumer products since the 1940s. Thousands of compounds belong to this family, although only a portion have been studied extensively.

Why are PFAS called "forever chemicals"?

The nickname is because many PFAS are “persistent” in the environment. They are highly resistant to natural degradation due to their strong carbon-fluorine bonds, meaning some can remain for long periods.

Can I tell if PFAS are in my drinking water?

Generally, no.

PFAS don't usually change the appearance, taste, or smell of drinking water. Laboratory testing remains the only reliable way to determine whether they're present.

Does boiling remove PFAS?

No.

Boiling water does not remove PFAS and may slightly increase their concentration because some water evaporates while the compounds remain behind.

Should every homeowner test for PFAS?

Not necessarily.

Many people can begin by reviewing the latest information from their water utility. If your home relies on a private well or local monitoring has identified elevated PFAS levels, certified laboratory testing may provide additional information specific to your household.

How often should filtration elements be replaced?

The type of filtering elements used determines replacement periods, the amount of water being filtered, and the properties of the water entering the system. By sticking to the manufacturer's maintenance guidelines, you can be sure that the system continues to function as it should.

Understanding Your Water Starts With Good Information

Think back to the glass of water from the beginning of this guide.

It probably looked clear then.

It still does.

What's changed is your understanding of what clear water can and can't tell you.

Every community's water is different, which is why local information matters far more than national headlines.

The goal isn't simply to react to PFAS.

It's to understand your water well enough to make informed decisions every day.