PFAS Water Watch

What PFAS Are and Why They Matter?

Per- and polyfluoroalkyl substances (PFAS) are a large family of synthetic chemicals used since the 1940s in products designed to resist heat, water, oil, and stains. Found in everything from nonstick cookware and waterproof clothing to firefighting foams and food packaging, PFAS have become an integral part of modern manufacturing.

Forever Chemicals

PFAS are often called “forever chemicals”

Decades Persistence

They persist in water, soil, and the human body for decades

Bioaccumulation

Chemicals accumulate in the body over time

Health Impact

Linked to thyroid disease and liver damage

why they matter

These chemicals are now detected in the blood of nearly every American, regardless of age or geography. Communities across the United States are facing the challenge of identifying contamination sources and reducing exposure. Understanding what PFAS are and how they behave in the environment is the first step toward protecting public health and restoring safe drinking water.

PFAS Water Watch aims to bring together the latest data, testing insights, and regulatory updates to empower individuals, communities, and policymakers in the fight against PFAS pollution.

Widespread Exposure

PFAS are detected in the blood of nearly every American, regardless of age or location.

Growing Community Concern

Communities across the United States are actively working to identify contamination sources and reduce exposure.

Understanding Is Protection

Knowing what PFAS are and how they behave in the environment is the first step toward protecting public health.

Restoring Safe Water

Efforts to address PFAS contamination are essential for ensuring long term access to safe drinking water.

Data Driven Awareness

PFAS Water Watch brings together the latest data, testing insights, and regulatory updates in one place.

Empowering Action

We support individuals, communities, and policymakers with the knowledge needed to take action against PFAS pollution.

Recent National Contamination Headlines

Major Cities & Nationwide Spread

  • PFAS contamination has made national headlines as testing reveals widespread water pollution across the country
  • Studies have detected PFAS in the drinking water of major metropolitan areas and small towns alike
  • Impact spans from New York and Chicago to rural communities in Michigan, North Carolina, and Colorado
  • Contamination is no longer regional, it reflects a nationwide issue

Data, Lawsuits & Rising Impact

  • In 2023, the U.S. Geological Survey estimated that nearly 45% of U.S. tap water contains PFAS
  • Contamination from firefighting foams at military bases and airports has driven federal attention
  • Lawsuits have been filed against major manufacturers like 3M and DuPont
  • In 2024, a $10 billion settlement was reached between 3M and hundreds of U.S. cities for cleanup costs

Why Communities Across the U.S. Are Testing for PFAS

Across the United States, communities are taking proactive steps to identify and manage PFAS contamination. Local water utilities are testing for these chemicals to comply with emerging regulations and to reassure residents that their water is safe. Federal programs, such as the EPA’s Unregulated Contaminant Monitoring Rule (UCMR 5), now require utilities serving millions of Americans to test for PFAS compounds between 2023 and 2025.

Testing helps pinpoint contamination sources, often linked to industrial discharges, landfills, or firefighting training sites. By mapping where PFAS appear in groundwater and surface water, scientists can trace pollution pathways and prioritize cleanup efforts.

Why Communities Across the U.S. Are Testing for PFAS

Beyond government action, citizens are also playing a role. Community advocacy groups, environmental NGOs, and even homeowners with private wells are using certified laboratories to test their own water supplies. As results become public, PFAS data is transforming how municipalities plan for treatment upgrades and communicate with residents.

Community Driven Testing

Citizens, advocacy groups, environmental organizations, and homeowners with private wells are actively testing their water supplies.

Independent Water Analysis

Certified laboratories are being used to generate reliable PFAS testing results across communities.

Data Changing Decisions

As test results become public, municipalities are using this data to plan treatment upgrades and improve communication with residents.

Awareness Turning Into Action

The increase in testing reflects a growing public awareness about the risks of PFAS contamination.

Measure Before You Fix

Communities recognize that contamination cannot be addressed without first understanding its scale.

Nationwide Movement

Across the United States, communities are taking the first step toward safer water by identifying the extent of PFAS exposure.
common Questions

Explore Common Questions

Are PFAS Regulated in My State?

PFAS regulations vary widely across the United States. While the EPA has proposed national drinking water standards, many states already have their own enforceable limits or advisory levels.

States like New Jersey, New York, Michigan, Massachusetts, and California have set strict Maximum Contaminant Levels (MCLs) for PFAS, often below 20 parts per trillion (ppt) for the most common compounds, PFOA and PFOS. Others, such as Wisconsin, Colorado, and Vermont, have implemented monitoring programs and guidance values but are waiting for the EPA’s final federal standards before setting enforceable rules.

To find out if PFAS are regulated in your state, visit your state environmental agency’s website or check the EPA’s PFAS Tracking Map, which lists current testing and regulatory actions nationwide. As federal standards are finalized, state-level rules will be updated to align with or exceed those limits.

Yes, certain filtration technologies can significantly reduce PFAS levels in drinking water, but not all filters are effective. The most reliable methods are:

  • Granular Activated Carbon (GAC): Adsorbs long-chain PFAS like PFOA and PFOS. Often used in municipal systems and home filtration units.

  • Ion Exchange (IX): Uses resin beads to attract and trap PFAS molecules; effective for both long- and short-chain compounds.

  • Reverse Osmosis (RO): Forces water through a semipermeable membrane, removing nearly all PFAS but at a higher cost and with water waste.

Typical pitcher filters or carbon faucet attachments may reduce PFAS slightly but are not certified for full removal. To ensure protection, look for systems certified to NSF/ANSI Standard P473 or equivalent. Regular maintenance and media replacement are essential for sustained performance.

Scientific studies link PFAS exposure to a range of potential health effects. Because these chemicals accumulate in the body over time, even low-level, long-term exposure can be concerning.

Research from the Centers for Disease Control and Prevention (CDC) and the Agency for Toxic Substances and Disease Registry (ATSDR) suggests associations between PFAS exposure and:

  • Liver and kidney damage

  • Thyroid hormone disruption

  • Elevated cholesterol levels

  • Immune system suppression

  • Reproductive and developmental issues

  • Certain cancers, including kidney and testicular cancer

Health effects depend on the type and concentration of PFAS, as well as the duration of exposure. Sensitive populations, such as pregnant women, infants, and individuals with chronic illnesses, may face greater risks. Ongoing research continues to refine our understanding of PFAS toxicity, but the scientific consensus is clear: reducing exposure is critical for long-term health.

PFAS are unusually persistent in the human body. Unlike many chemicals that break down or are excreted quickly, PFAS remain for years. Studies show that the biological half-life of common compounds such as PFOA and PFOS can range from 2 to 9 years, depending on the individual and the level of exposure.

These chemicals bind to blood proteins, circulate through organs, and are slowly eliminated through urine and other bodily fluids. Because the rate of removal is so slow, regular exposure through drinking water or food leads to gradual accumulation.

Reducing exposure, by using filtered water, avoiding PFAS-containing products, and supporting cleanup efforts, can help lower body burden over time. However, once PFAS have accumulated, it can take several years for levels to decline naturally.