PFAS in Montgomery and Bucks County Tap Water: What the Numbers Mean

Why PFAS Is a Local Story Here

PFAS (per- and polyfluoroalkyl substances, often called forever chemicals) resist breaking down in the environment and build up in the body over time. Montgomery and Bucks County sit at the center of one of the most significant PFAS contamination events in the country: AFFF firefighting foam used for decades at military installations in Warminster, Willow Grove, and Horsham spread through the groundwater for over 50 years.

The hardest-hit areas have been Horsham, Warminster, and Warrington, where private wells have tested at elevated levels. Detections are not limited to those towns: utilities across both counties have reported measurable PFAS, and nearly 19 percent of Pennsylvania water systems tested exceed the new federal standards.

How to Read the Numbers: MCL vs. Health Goal

PFAS results are reported in parts per trillion (ppt), and two very different reference points show up in the reports. The enforceable federal limit (MCL) for PFOA and PFOS is 4 ppt, finalized in 2024 with compliance required by 2029. The EPA health goal (MCLG) for both chemicals is zero, because the EPA classifies them as likely human carcinogens with no established safe level.

That gap explains most of the confusion in local headlines. A utility can be perfectly legal today and still show detections far above the health goal. For example, Collegeville's 2024 report shows PFOA at 12.88 ppt: over three times the incoming federal limit, and the utility has until 2029 before that limit is enforceable.

Utility reports describe the water system as a whole. Your own taps depend on your service line, plumbing, and, for well owners, whatever is in your groundwater. Private wells near the contamination zone are not covered by any utility monitoring at all.

What Actually Removes PFAS (and What Does Not)

Boiling water does nothing to PFAS, and a standard water softener does not touch it either. Two residential technologies have a real track record.

• Reverse osmosis: Under-sink systems that remove up to 99 percent of dissolved contaminants, including PFAS, lead, and arsenic. The most cost-effective protection for drinking and cooking water.
• Activated carbon filtration: Whole-home systems that reduce certain PFAS along with chlorine and chemical taste at every tap. Media selection and replacement schedule matter, which is why sizing should follow a water test.
• Not effective: boiling, standard softeners, fridge filters not rated for PFAS, and countertop pitchers without PFAS certification.

Check Your Town, Then Test Your Taps

We publish per-town water quality reports built from utility disclosures and federal monitoring data for communities across Montgomery County, Bucks County, and the Main Line. Look up your town on our water quality page to see exactly what has been detected in your system, including PFAS, with every number sourced and explained in plain English.

If your town shows detections, or you are on a private well anywhere near Horsham, Warminster, Warrington, or Willow Grove, the next step is testing the water that actually comes out of your taps. Our in-home water test is free, performed by a licensed plumber, and comes with straight answers instead of a scare-tactic sales demo. Call 484-902-2111 or book online and mention code FREETEST.