A buyer touring a West Ambler colonial this year can pull up a search on their phone before the showing even ends and land on decades of Superfund history: waste piles, a reservoir lined with asbestos shingles, a factory that once supplied insulation to half the country. It's an easy search to make in this particular borough. It's also the wrong question to ask about the house in front of them.
Pennsylvania's seller disclosure law does not ask what sits down the street. It asks what the seller knows about the structure and soil of the specific property being sold. Those are two different inquiries, running on two different clocks, and conflating them is the most common way an Ambler transaction gets more complicated than it needs to be.
What the state disclosure form actually asks
Federal law is silent on this. The EPA's own guidance states plainly that federal law does not require a seller to disclose asbestos or vermiculite to a buyer, and leaves the question to states.
Pennsylvania fills that gap. Under the Real Estate Seller Disclosure Law, codified at 68 Pa. C.S. §7301-7314, a seller must complete a Property Disclosure Statement before an agreement of sale is signed. The model form spelled out in the Pennsylvania Code asks, in plain language, whether the seller is aware of any hazardous substances present on the property, structure or soil, including but not limited to asbestos, PCBs, radon, lead paint, or urea-formaldehyde foam insulation. Note the framing: the property, the structure, the soil. Not the neighborhood.
The obligation is triggered by knowledge, not by testing. Pennsylvania does not require a seller to hire a lab before listing a house. It requires a seller to answer honestly about what they already know, and it holds them to what they reasonably should have known given how long they've lived there. A seller who genuinely doesn't know whether that basement floor tile contains asbestos can say so. A seller who has a pipe wrap report from a 2010 renovation cannot leave that box blank.
Two sites, two very different timelines
Ambler's own asbestos history runs through two separate federal cleanup sites, and neither one appears on a homeowner's disclosure form, because neither one is the homeowner's property.
The Ambler Asbestos Piles site sits on Locust Street: 25 acres containing three waste piles and a series of backfilled lagoons left behind by three companies that manufactured asbestos products there in the twentieth century. The EPA's cleanup there wrapped up in the early 1990s, and the site was removed from the National Priorities List in 1996. It's still checked periodically, but it has been off the active federal list for three decades.
The second site, BoRit, sits about a mile away on Maple Street and is more complicated because it's really three parcels in one. The EPA's own reuse profile breaks it down: a 6-acre Asbestos Pile Parcel with a 3-acre waste pile at its center, a 15-acre Reservoir Parcel, and an 11-acre Park Parcel that had been a neighborhood playground until asbestos contamination closed it in the 1980s. The EPA added BoRit to the National Priorities List in 2009, spent nearly a decade capping the waste pile with geotextile and clean fill and stabilizing the banks of three creeks that cross the property, and finished the core remediation work in 2017. The agency's final plan, reported by WHYY at the time, called for two more years of air, soil and water testing before management responsibility shifted toward the Pennsylvania Department of Environmental Protection. Quarterly inspections and periodic five-year reviews continue today.
None of that timeline has anything to do with what a seller writes on a disclosure form for a house three streets away. The site is a federally managed property with its own owner, its own monitoring schedule and its own remedy. A private home is a different piece of real estate with a different chain of custody.
The land that used to worry people is now a park
The clearest evidence that regulators consider this risk managed, not merely explained away, is what's happening on the ground right now.
The Reservoir Parcel of the BoRit site has become the Wissahickon Waterfowl Preserve, a bird sanctuary with a viewing area and walking trails built directly on top of what used to be a manufacturing reservoir lined with asbestos shingles. The EPA's redevelopment profile notes that the Park Parcel, the same 11 acres closed to children in the 1980s, was expected to become a township park again.
That prediction is no longer hypothetical. Whitpain Township's own Wissahickon Park, located at 50 Oak Street in the West Ambler section of the township, broke ground in April 2025 and reopened in 2026 as an active community park. It now has two playgrounds split by age group, full and half-court basketball, a grass volleyball court, new sidewalks connecting to the Boys & Girls Club, stormwater improvements, added parking, and a half-mile paved walking trail around the perimeter. Kids are back on the exact ground the EPA once fenced off.
The pattern isn't limited to green space. The Ambler Boiler House, built in 1897 as part of the original Keasbey and Mattison plant and left vacant when the company dissolved in 1962, later went through a full renovation partly funded by an EPA brownfield grant and now operates as commercial space. Land that once defined the town's biggest liability has spent the last decade becoming ordinary infrastructure again.
Where the seller's own obligation actually starts
None of this settles the separate question a seller faces on their own paperwork, because that question was never about the Superfund sites in the first place.
Ambler's older housing stock was built across the same decades the Keasbey and Mattison plant operated, which means a meaningful share of the borough's Victorians, American Foursquares and Colonial Revivals date to an era when asbestos was a standard, unremarkable building material nationwide. Floor tile, pipe insulation, and older siding are the categories that come up most often, and they show up in pre-1980 housing stock everywhere, not just in Ambler specifically. What's different here is the density of that era's construction relative to newer development.
A general home inspector who spots a suspect material during a routine inspection will typically flag it as a possible asbestos-containing material rather than confirm it outright, since a positive identification requires laboratory analysis under a microscope, not a visual check. That distinction matters for how the transaction actually moves. An inspector's note that something looks like it might contain asbestos is not the same as a seller's confirmed knowledge that it does. A seller who already knows, because a prior contractor tested it or a past renovation turned it up, has to answer the disclosure question accordingly. A seller who genuinely has no such information can say so honestly, and that answer is not a red flag on its own.
The exposure runs the other direction too. If a seller knows about asbestos-containing material and checks the box saying they're not aware of any hazardous substances, Pennsylvania law treats that as a basis for a lawsuit, and a buyer who can prove the seller had actual knowledge can pursue compensatory damages for the cost of dealing with it later.
What this means if you're listing an older Ambler home
The practical version of all this is straightforward. Living near BoRit or the old Locust Street piles is not itself a disclosable condition, because it's not a condition of your property. What you actually know about your own house, from past inspections, past renovations, or past conversations with contractors, is what goes on the form.
If you're unsure whether your home has any asbestos-containing material and want to head off the question before a buyer's inspector raises it, a targeted pre-listing test is a reasonable option to discuss with your agent, though Pennsylvania doesn't require it. If a buyer's inspection flags something suspect after you're under contract, that's a normal point for negotiation rather than a reason the deal falls apart. Buyers in a town with Ambler's industrial history are rarely surprised that an older home might have some trace of it somewhere.
A few quick questions
Does living near the BoRit site or the Ambler Asbestos Piles mean I have to disclose anything special when I sell? No. The disclosure form asks about your specific property, not about nearby land under separate ownership and separate federal or state oversight.
Do I need to test my home for asbestos before I list it? Pennsylvania doesn't require it. Some sellers choose to test proactively so they can answer the disclosure question with certainty and avoid surprises during a buyer's inspection.
Can a buyer walk away or renegotiate if an inspector flags a suspected asbestos-containing material? It happens, but it's a negotiation point, not an automatic dealbreaker. Since confirmation requires lab testing, many transactions move forward with a credit, a repair, or simply an acknowledgment in writing.
If you're weighing what to say on a disclosure form for an older Ambler home, or trying to read what a buyer's inspection report actually means, Diane Reddington has spent decades walking Montgomery County sellers through exactly this kind of paperwork. Let's Connect.
