Which Ambler, and which school district
Ambler is a borough, incorporated in June 1888, 0.85 square miles, about 6,807 people, in Wissahickon School District. It borders Horsham Township to the northeast and Upper Dublin Township, which is where Temple University Ambler actually sits. Wissahickon High School is in Lower Gwynedd. Neither is in the borough.
That is the shape of the problem. An “Ambler, PA 19002” address covers land in Upper Dublin, Whitpain, Lower Gwynedd, Horsham and beyond. A boundary comparison against Census 2020 geography puts only about 4.12% of the 19002 area inside the borough, against 32.51% Lower Gwynedd, 29.08% Horsham Township and 24.09% Upper Dublin. Those shares are measured by land area, so read them as an estimate; the direction is not close.
The tax bill that follows
Assessments here sit on a 1996 base year. The Common Level Ratio factor for documents accepted between July 2026 and June 2027 is 3.36, so assessed value is roughly the market price divided by 3.36.
One post office, five answers for 2026. Lower Gwynedd 33.775 mills, Whitpain 36.502, Ambler Borough 42.367, Horsham Township 44.837, Upper Dublin 54.4758. Three school districts in that list: Wissahickon at 26.600 mills, Hatboro-Horsham at 36.160, Upper Dublin at 41.1418.
On the district-average assessment of $211,265, and this is arithmetic from the published millage, that comes out at about $7,135 in Lower Gwynedd, $7,712 in Whitpain, $8,951 in Ambler Borough, $9,472 in Horsham Township and $11,509 in Upper Dublin. The borough and Upper Dublin are about $2,558 a year apart on the same mailing address, and nearly all of that gap comes from the school district, with the municipal rates barely moving it.
Prices need the same care. Movoto’s $830,000 median for “Ambler, PA” in July 2026 rests on 102 sales in one month, in a borough of 0.85 square miles and 6,807 people. That cannot be the borough; it is the wider mailing area, weighted toward the township land around it. For a borough-level read, work from assessments: Ownwell’s Ambler page, updated in April 2026, gives a median assessed value of $198,010 and a median annual bill of $8,109, and $198,010 multiplied by the 3.36 factor implies something near $665,000 of market value. Call that an estimate and expect a specific house to argue with it.
Transfer tax is 2.000% at every Montgomery County address, borough or township. The swing happens at the county line.
The houses
Keasbey and Mattison is why the borough looks the way it does. The firm moved here in the early 1880s to make asbestos insulation, found a village of 70 houses and built a company town on top of it: roughly 400 worker houses, a library, an opera house, a church, and the water and electric companies. The houses were twins and semi-detached, attached rows graded by rank, built largely by stone masons brought from southern Italy. The Historic American Buildings Survey documents the rows at 100–114 and 214–228 South Chestnut Street, which first appear on the 1902 Sanborn map.
So the practical era range is late 1880s to about 1930, stone and brick, with post-war infill after that. No Census housing-age table for the borough could be obtained, so there is no honest median year built to quote; a specific address is the only way to answer it.
Two negative findings save you worry. There is no Ambler Historic District and the borough has no historic architectural review board, so a purchase carries no design-review step. And the K&M boiler house came back as a LEED Platinum office building in 2013, a $16 million conversion. The station is at 35 West Butler Pike, fully accessible since the 2010 rebuild, and the 7:42 express is 30 minutes to Jefferson — part of why buyers compare a borough twin against an Upper Dublin colonial in the first place.
What a lender will ask about here
Asbestos, and the answer has boundaries. There are two capped Superfund sites, and neither means what people assume.
The Ambler Asbestos Piles are 25 acres on Locust Street. Listed on the National Priorities List in June 1986, record of decision in 1988, remedy built in 1992–93, deleted from the list in 1996. Waste stayed in place, so five-year reviews continue; the most recent was June 2022 and found the remedy protective in the short term, with the next due around 2027. At its 1974 peak the material ran to more than 1.5 million cubic yards, the tallest pile over 90 feet.
BoRit is separate. About 32 acres in three parcels straddling Ambler Borough, Upper Dublin and Whitpain, proposed to the National Priorities List in September 2008 and added on 9 April 2009. The record of decision of 28 July 2017 called for capping everything with a geotextile liner under at least two feet of clean cover, stabilising the stream banks, recording land-use controls and long-term operations and maintenance. Removal work finished in September 2017, and post-construction sampling from April to July 2018 found no exceedances. Wissahickon Park opened on the 11-acre park parcel on 9 June 2026, reopening a West Ambler park that had been closed since 1984.
What that means for a file: recorded deed restrictions on the affected parcels, continuing federal review, and a real chance that a Phase I environmental report flags proximity for a commercial or investment purchase. It does not mean every Ambler property is affected. Give the lender the address and the boundaries do the rest.
The other local item is utilities. The borough runs both water and sewer — nine deep wells plus a surface supply, about 70 miles of main, roughly 5,700 connections across a franchise reaching into four townships. Sewer has been $7.50 per 1,000 gallons since January 2024. Water rates are not published online, so ask the borough before you build a monthly number.
Next town over
Horsham shares this ZIP for nearly a third of its land and none of its school district. Lansdale is up the same rail line, in North Penn.
What to do next
Call with the address, or with the parcel number if the listing has one, and say what you are trying to do. A licensed Pennsylvania mortgage lender calls you back, usually the same working day and by the end of the next working day at the outside. Typing works as well as talking. Send it along and it goes to the same place. In Ambler the envelope is the least reliable document in the file, so start with the deed.
