PFAS Found in Your Local Creek. Is It in Your Tap Water?

What Pennsylvania actually found

On October 7, Pennsylvania's Department of Environmental Protection and its Fish and Boat Commission issued a “Do Not Eat” advisory covering every fish species in the Wissahickon Creek basin, across Montgomery and Philadelphia counties.3 The trigger was PFOS, one of the PFAS compounds, found in fish tissue above the 0.04 parts per million level that prompts that advisory, with reported levels reaching roughly 0.057. The tissue came from sampling near Fort Washington State Park and included archived samples collected between 2013 and 2021.1

The Commission then canceled an October 15 trout stocking on a Philadelphia stretch, though officials said the stocked trout themselves likely carry no PFAS, and set a public meeting for November 5.1 The department has not identified the source, says there are no other public health concerns at present, and will keep monitoring.2

One detail explains why the story landed the way it did. The Wissahickon is also a drinking water source, feeding the supply for roughly one in four Philadelphians.2 A notice about fish read, to many households, like a notice about their tap. It was not one.

A fish is not a faucet

PFOS readily bioaccumulates in fish tissue.4 A fish is exposed continuously and does not clear the compound quickly, so what is present in the creek concentrates in the animal over years. Federal guidance for health assessors says PFOS can accumulate in edible tissues to levels that could be of human health concern, and warns that PFAS do not follow the bioaccumulation patterns of older advisory contaminants such as PCBs and mercury.5

Treated drinking water travels a different path: drawn from a source, run through a plant, piped to your house, and measured as a concentration in water at a sampling point. A fish result describes the creek and years of accumulation in an animal, not what the plant removed.

None of which makes a watershed finding irrelevant to your kitchen. If a creek carrying PFAS feeds a plant that serves your house, that is a sound reason to go and read the plant's own results. It is a reason to check, not a result.

How to find out what is in your tap

Your utility's annual report.

Every community water system publishes a Consumer Confidence Report listing what it detected and at what level.8 PFAS is new to that document: under the federal rule, systems must finish initial PFAS monitoring and begin reporting PFAS levels publicly in 2027, with any required reductions in place by 2029.6

Find your water quality report ↗

The national PFAS sampling already done.

You do not have to wait for 2027. EPA's fifth Unregulated Contaminant Monitoring Rule had systems sample for 29 PFAS compounds plus lithium between January 2023 and December 2025, and the final dataset arrived in August 2026, searchable by water system. Two caveats come from EPA itself: systems serving fewer than 3,300 people were sampled only if randomly selected, and the results do not indicate compliance or noncompliance.7

Search the UCMR 5 PFAS results ↗

On a private well, none of that covers you.

A private well has no utility behind it and no routine monitoring, so the only way to get a number is a state-certified laboratory. Our guide to testing your tap water covers what that involves. Epic's What's in Your Water lookup shows what has been reported nearby, which is background, not a test of your own tap.

What a filter can and cannot do

Start with what not to do. Minnesota's health department is direct: boiling will not remove PFAS. The same guidance names what does, when properly installed and maintained: granular activated carbon and reverse osmosis, with some ion exchange resins also effective. Softeners and iron filtration systems are not likely to.9 More on that mistake in what boiling does and does not remove.

“Properly maintained” is the load-bearing phrase. Carbon capacity is finite, and a cartridge past its rated life is not doing what its data sheet describes. If you already run one, check how often yours needs replacing first.

Certification and testing are two different documents.

Pure XP and Nano XP are listed by NSF under Standard 42 for material safety and under NSF/ANSI/CAN 372 for lead content.1011 Those cover material safety and lead-free limits. Neither is a contaminant-reduction certification, and we do not present them as one. PFAS reduction is documented in independent laboratory testing instead, so read the report for the exact filter before relying on any PFAS figure.12

Read Epic's testing documents ↗

And the limit worth saying out loud: a pitcher treats the water you pour through it, not every tap in the house, not the fish in the creek, and not the source. If you are pregnant or mixing formula, the order of the checks matters more than the hardware, which is why we wrote what to check during pregnancy, in order. If a notice does arrive, the tier printed on it tells you the schedule, not how alarmed to be.

If a pitcher or dispenser fits how your household drinks water, explore Epic's pitchers, dispensers, and bundles. Read the documentation for the exact cartridge first.