In April 2024, the EPA established the first-ever federal drinking water limits for PFAS—a class of toxic "forever chemicals" found in tap water across America. If you've heard about PFAS contamination but aren't sure what it means for your family, you're not alone. These persistent pollutants have contaminated drinking water supplies in hundreds of communities, and new regulations make it essential for homeowners to understand the risks and take action. This guide explains what PFAS are, where they come from, the latest EPA regulations, health effects, and practical steps you can take to protect your water quality today.
What Are PFAS and Why Are They Called "Forever Chemicals"?
PFAS stands for per- and polyfluoroalkyl substances—a group of roughly 12,000 human-made chemicals used in thousands of products since the 1940s. The reason they're called "forever chemicals" is straightforward: they don't break down in the environment or in the human body. Once PFAS enter soil, groundwater, or your bloodstream, they persist indefinitely.
PFAS molecules are extremely stable because of the strong carbon-fluorine bonds that hold them together. While this stability makes them useful in manufacturing, it also means they accumulate in your body over time—a process called bioaccumulation. The two most studied and regulated PFAS compounds are:
- PFOS (perfluorooctane sulfonate) — widely used in aqueous film-forming foams (AFFF) and non-stick coatings
- PFOA (perfluorooctanoic acid) — used in Teflon and other fluoropolymer manufacturing
Both are now found in the blood of nearly 97% of Americans, according to CDC data, even in people who've never directly handled these chemicals.
Where Do PFAS Come From?
Military Bases and Airports
The largest source of PFAS contamination in the United States is aqueous film-forming foam (AFFF)—a firefighting foam used extensively at military installations, airports, and training facilities since the 1970s. This foam contains extremely high concentrations of PFOS and PFOA. When AFFF is sprayed during fire training exercises or emergency response, it seeps into soil and groundwater, eventually reaching drinking water supplies.
Communities near military bases, Air Force installations, and major airports have experienced severe PFAS contamination as a result. In some cases, PFAS levels near military sites have exceeded current EPA limits by a factor of 100 or more.
Teflon and Non-Stick Manufacturing
PFOA was the primary chemical used in manufacturing Teflon and other non-stick coatings for cookware, food packaging, and industrial equipment. DuPont's plant in Parkersburg, West Virginia, became one of the most infamous PFAS contamination sites in America, with PFOA contaminating groundwater and drinking water for thousands of residents. The company paid a major settlement but the contamination persists.
Consumer Products and Industrial Uses
PFAS are also found in water-repellent clothing, stain-resistant furniture fabrics, food packaging, and dental floss. When these products degrade or are discarded in landfills, PFAS can leach into groundwater. Industrial wastewater and landfill leachate are secondary but significant sources of PFAS contamination.
New EPA Regulations: 2024 Maximum Contaminant Levels (MCLs)
In April 2024, the EPA finalized the first federal drinking water standards for PFAS, marking a major regulatory shift. These Maximum Contaminant Levels (MCLs) set binding limits on how much PFAS public water systems can allow in drinking water.
The new EPA MCLs are:
- PFOS: 0.02 ppb (parts per billion)
- PFOA: 0.004 ppb
- PFHxS (perfluorohexane sulfonate): 0.01 ppb
- PFNA (perfluorononanoic acid): 0.01 ppb
- Mixtures of PFOA and PFOS: combined 0.02 ppb
To put these numbers in perspective: 0.02 ppb means 2 parts of PFOS in 100 billion parts of water. These are exceptionally strict standards, reflecting the EPA's concern about PFAS health risks even at tiny concentrations. Public water systems must begin compliance testing immediately and achieve full compliance by 2027.
Health Risks of PFAS Exposure
Cancer
The strongest evidence links PFOA and PFOS exposure to kidney and testicular cancer. A landmark 2022 study in the journal Environmental Health Perspectives found that people with the highest PFOA exposure had a significantly increased risk of kidney cancer. Regulatory agencies now classify PFOA as "likely carcinogenic to humans."
Immune System Disruption
Multiple studies show that PFAS exposure reduces the effectiveness of vaccines and weakens immune response to infections. Children exposed to PFAS show lower antibody responses to routine childhood vaccinations—a particularly concerning finding for parents. The immune-suppressing effects can occur at relatively low exposure levels.
Thyroid and Liver Problems
PFAS exposure is associated with thyroid disease, particularly in women and children. Studies also link PFAS to fatty liver disease and elevated liver enzymes, suggesting that these chemicals damage organ function at low doses.
Pregnancy and Developmental Effects
PFAS cross the placental barrier and have been detected in umbilical cord blood of newborns. High PFOA exposure during pregnancy is linked to lower birth weight, delayed development, and other adverse outcomes.
The EPA established the MCLs partly because there is no known safe level of PFAS exposure. Even tiny amounts can accumulate in your body and trigger health effects over decades.
Which States and Communities Have the Worst PFAS Contamination?
PFAS contamination is not evenly distributed—certain geographic areas face far greater risks due to military bases, manufacturing history, or industrial activity.
Highest-risk states include:
- North Carolina — particularly near military bases and Cape Fear River areas
- New Jersey — widespread contamination from historical manufacturing and landfills
- Pennsylvania — PFAS found in multiple water systems, especially near military facilities
- Ohio — significant contamination in groundwater and surface water
- California — extensive contamination near military bases and in Northern California
- Vermont — aquifer contamination from AFFF at airports and military sites
- New York — contamination in multiple public water systems
However, PFAS has been detected in drinking water in all 50 states. Even if your state isn't listed above, PFAS could be present in your local water supply.
How to Test Your Tap Water for PFAS
Check Public Water System Reports
If you use municipal tap water, your water utility is now required to test for PFAS under the new EPA rule. Ask your water provider for their latest water quality report—also called a Consumer Confidence Report (CCR). Many utilities publish these online. Look for PFOS, PFOA, and other PFAS results to see if your water exceeds the new EPA MCLs.
Use ClearWater's Free Lookup Tool
You can quickly find your local water quality data by entering your ZIP code on ClearWater's free drinking water lookup tool. This instantly shows you what contaminants—including PFAS—have been detected in your area and how levels compare to EPA standards. It's a fast way to understand your specific water risk without waiting for utility reports.
Independent Lab Testing
If you have a private well, use bottled water, or want confirmation beyond public data, hire a certified lab to test your water. Contact your state environmental agency for a list of EPA-approved labs that test for PFAS. Cost typically ranges from $200–500 for a full PFAS panel, but the peace of mind for your family may be worth it.
What to Test For
Request testing for at least PFOS, PFOA, PFHxS, and PFNA—the four compounds with EPA MCLs. A comprehensive PFAS screening will test for 20+ compounds, giving you a fuller picture of exposure.
Water Filters That Remove PFAS
If your tap water contains PFAS, or if you live in a high-risk area, water filtration is an effective defense. Not all filters work equally—some remove PFAS completely, while others provide minimal protection.
Reverse Osmosis (RO) Filters
Reverse osmosis is considered the gold standard for PFAS removal. RO systems force water through a semi-permeable membrane under pressure, removing up to 99% of PFAS and other contaminants. These can be installed under the sink (point-of-use) or for the whole house (point-of-entry). The downside is that RO systems waste water and have a slower flow rate than other filters.
Activated Carbon Filters
High-quality activated carbon filters (particularly granular activated carbon, or GAC) are effective at removing PFAS, though effectiveness varies by brand and design. Pitcher filters and faucet-mounted carbon filters can remove some PFAS, but whole-house carbon filtration systems provide more comprehensive protection. Carbon filters need frequent replacement—typically every 3–6 months depending on water quality and usage.
Ion Exchange Resins
Some water softeners and specialized filtration systems use ion exchange technology to remove PFAS. These work by binding PFAS molecules to resin beads. They're less common than RO or carbon but can be effective for specific PFAS compounds.
Distillation
Distillers boil water and collect the steam, leaving contaminants behind. They remove PFAS very effectively but are slow and energy-intensive. Distillation is practical for drinking water only, not for whole-house use.
Choosing the Right Filter
When selecting a filter:
- Test first: Know which PFAS compounds are in your water before buying a filter
- Verify NSF/ANSI certification: Look for filters certified to NSF/ANSI Standard 53 or 58, which specifically test PFAS removal
- Check replacement costs: Filters need regular replacement—factor ongoing maintenance into your decision
- Consider your water use: If you need filtered water for cooking and drinking, under-sink RO or whole-house carbon may be worth the investment
- Don't rely on basic filters: Standard Brita-type pitcher filters do not effectively remove PFAS
Bottled Water and PFAS
Many people assume bottled water is PFAS-free, but this isn't always true. Some bottled water brands source from municipal supplies that may contain PFAS. Additionally, bottled water isn't as heavily regulated as tap water, and manufacturers aren't always transparent about testing. If you choose bottled water, look for brands that publicly disclose PFAS testing results.
Long-term reliance on bottled water is also expensive and environmentally problematic due to plastic waste.
What You Can Do Right Now
Step 1: Find Out If PFAS Is in Your Water
Enter your ZIP code in ClearWater's lookup tool to see if PFAS has been detected in your area. If you use a public water system, check your latest water quality report or call your utility directly.
Step 2: Understand Your Risk Level
Do you live near a military base, airport, or industrial site? Do you have a private well? Are you pregnant or do you have young children? These factors increase the importance of taking protective action.
Step 3: Consider Water Filtration
If PFAS is detected in your area or your water test, invest in a certified water filter. Reverse osmosis and activated carbon are both effective options. Make sure the filter is certified for PFAS removal and maintain regular replacement schedules.
Step 4: Stay Informed
Bookmark your water utility's website and check for annual water quality reports. As the EPA enforcement deadline approaches in 2027, water systems may discover new PFAS contamination and take corrective action. Staying informed helps you make timely decisions about filtration.
Step 5: Reduce Unnecessary Exposure
Beyond drinking water, limit exposure to other PFAS sources: choose cookware and food containers without non-stick coatings, avoid water-repellent clothing when possible, and support legislation pushing manufacturers to phase out PFAS.
The Bottom Line
PFAS contamination in American drinking water is a serious public health issue—one that the EPA only recently began to regulate. The new 2024 MCLs represent important progress, but compliance won't be complete until 2027, and many private wells and smaller water systems face even greater challenges.
The good news: you have tools and options to protect your family today. By testing your water, understanding your local risk, and investing in the right filtration system, you can reduce your PFAS exposure significantly. Start by checking your water with a free lookup tool, then take action based on your results. Your family's health is worth the effort.