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Philadelphia's Tap Water Meets Federal Standards—But Should You Worry About PFAS in 2024?

What's happening with Philadelphia's water?

Philadelphia's tap water meets current federal drinking water standards, but a new analysis suggests the city's water contains levels of PFAS (per- and polyfluoroalkyl substances) that fall short of what some public health experts consider safe. PFAS are synthetic chemicals used in thousands of products—nonstick cookware, water-resistant textiles, food packaging, and firefighting foam—that don't break down naturally in the environment.

The concern centers on the gap between what the Environmental Protection Agency (EPA) currently allows and what some toxicologists and health organizations recommend as safer exposure limits. This mismatch is creating confusion for residents trying to decide whether to take extra precautions with their drinking water.

What PFAS chemicals are in the water?

According to the analysis, Philadelphia's tap water contains measurable amounts of PFAS compounds. The city's water utility has reported detecting these chemicals, which is not unusual—PFAS have been found in tap water supplies across the United States. The specific chemicals and their concentrations matter because different PFAS compounds have different toxicity profiles.

In 2024, the EPA has begun regulating certain PFAS more strictly than in the past, but experts argue these standards may not adequately reflect emerging research about health risks at lower exposure levels.

Who is affected?

Anyone regularly drinking Philadelphia's tap water is potentially exposed to PFAS. This includes roughly 1.6 million Philadelphia residents plus people in surrounding areas served by the city's water system. Vulnerable populations—including pregnant women, infants, children, and people with compromised immune systems—may warrant extra caution, as early-life PFAS exposure has been associated with developmental and immune effects in some research.

People with private wells in the Philadelphia region should be especially aware: well water is not regularly tested for PFAS by public authorities. If you use a private well, testing through a certified lab is one way to know your exposure.

Why does this matter?

PFAS are sometimes called "forever chemicals" because they resist breakdown in the human body and the environment. Scientific research has associated PFAS exposure with health effects including kidney and liver damage, thyroid disease, weakened immune response, and increased cholesterol levels. Some PFAS are also associated with cancer risk in epidemiological studies, though scientists are still investigating the precise mechanisms.

The EPA's 2024 drinking water standards represent progress, but many independent researchers believe even stricter limits would be warranted based on available evidence. The gap between federal standards and what some experts recommend as protective limits is fueling legitimate questions from consumers about whether regulatory minimums reflect the strongest science.

This is particularly important because drinking water is not the only source of PFAS exposure. You also encounter these chemicals through food packaging, non-stick cookware, and other consumer products, so total exposure can accumulate over time.

What should you do?

If you want to reduce PFAS exposure from tap water:

• Test your water: Contact Philadelphia Water Department to request a consumer confidence report, which discloses PFAS detections. Some certified labs offer affordable PFAS testing if you want household-level data. Use our water filter finder tool to learn which treatment methods address PFAS.
• Consider a filter: Certain filters can reduce PFAS in tap water. Activated carbon filters (pitcher, faucet-mounted, or whole-house) and reverse osmosis systems show effectiveness against some PFAS compounds. Look for certified filters (NSF/ANSI Standard 53 is relevant for some contaminants). Understand that no single filter removes all PFAS equally—effectiveness varies by specific chemical and filter type.
• Reduce other exposures: Minimize use of non-stick cookware when possible, reduce consumption of processed foods (which may be packaged with PFAS-containing materials), and avoid water-resistant textiles treated with PFAS if feasible. These steps reduce total body burden alongside water precautions.
• Stay informed: EPA standards may shift as science evolves. Check the PFAS Database methodology to understand how regulations and safety recommendations are developed.
• Talk to your doctor: If you have specific health concerns related to PFAS or your drinking water, discuss them with your physician, who can advise based on your individual risk factors.

Bottom Line

Philadelphia's tap water meets federal drinking water standards for PFAS, which means it is legally compliant. However, some public health researchers argue that federal limits may not reflect the strongest available science about PFAS health risks. If you want to reduce your exposure—particularly if you're pregnant, have young children, or have other health concerns—a certified water filter or purchasing filtered water is a reasonable precaution. Addressing PFAS exposure is a personal decision based on your comfort level and values.

FAQ

Is Philadelphia tap water safe to drink?

Philadelphia tap water meets EPA drinking water standards, meaning it is legally considered safe. However, some independent toxicologists and health organizations recommend lower PFAS levels than current federal standards allow. Your personal risk tolerance and health status may influence whether you choose to take additional precautions.

What's the difference between EPA standards and "public health goals"?

EPA drinking water standards are legally binding regulatory limits based on health data, feasibility, and cost-benefit analysis. Public health goals are non-binding recommendations from some health organizations, universities, and state agencies that reflect their interpretation of the strongest available science. Public health goals are often more conservative than enforceable standards.

Do all water filters remove PFAS?

No. Standard filters like those in pitchers do not effectively remove PFAS. Activated carbon filters and reverse osmosis systems show promise, but effectiveness varies by PFAS type and filter quality. Look for NSF certification relevant to your contaminant concern, and understand filter limitations before purchasing.

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