Mold Testing in Delaware County, PA
PRO-LAB certified mold inspection across all 42 Delaware County towns, from Upper Darby and Drexel Hill west to Media, Swarthmore, and Glen Mills. Air sampling, an outdoor control sample, and lab results in 2 to 3 days, starting from $275. Twin and rowhome party walls included. Call 610-348-6728 for a free estimate.
Delaware County, Pennsylvania
Mold Inspection & Testing across Delaware County
Written by Bob, owner and inspector, All Seasons Home Inspections ·
Mold testing in Delaware County starts at $275 and includes air sampling, an outdoor control sample, and PRO-LAB certified analysis in 2 to 3 days. Bob collects every sample personally across all 42 Delaware County towns, from Upper Darby and Drexel Hill west to Media, Swarthmore, and Glen Mills.
Delaware County is defined by two things: water and density. Five significant creek systems run through it, Darby Creek, Naylors Run, Cobbs Creek, Ridley Creek, Crum Creek, and Chester Creek, and almost every town in the county sits in or near one of their drainage basins. Groundwater sits high across large parts of the county as a result, which is why basement moisture is the single most common condition Bob documents here.
The density is the second half. The eastern townships hold one of the tightest concentrations of twin and rowhome construction outside Philadelphia itself, in Upper Darby, Drexel Hill, Lansdowne, Clifton Heights, Darby, Yeadon, Folcroft, Glenolden, Norwood, Prospect Park, and Sharon Hill. Shared walls mean shared moisture, and a neighbor's unaddressed problem becomes yours through the party wall the same way it does in a Philadelphia row.
Who does your mold testing
Bob, owner and inspector
Every sample on every Delaware County job is collected by Bob personally. Not a technician, not a subcontractor, and not a different person each visit. He has been inspecting homes in Delaware County and the greater Philadelphia region since 2003, he is InterNACHI certified, and every sample he takes goes to a PRO-LAB certified laboratory. All Seasons does not perform mold removal or remediation, so there is no financial reason to find a bigger problem than you have.
Why is basement moisture so common in Delaware County?
The creek systems are the reason. Darby, Cobbs, Ridley, Crum, and Chester Creeks and their tributaries cut through the county, and the housing was built across their drainage basins without much regard for where the water table sits. In a lot of these neighborhoods the groundwater is close enough to the basement floor that hydrostatic pressure pushes moisture through the slab and the lower walls year round.
The 1940s to 1960s housing that dominates the county compounds it. That construction used block foundations and minimal or no exterior waterproofing, and block is considerably more permeable than the stone used in earlier eras.
The practical effect is that a Delaware County basement is often damp as a baseline condition rather than because something broke. That does not make it harmless, and it does mean finishing one without addressing the water first is a reliable way to create a mold problem.
How do twin and rowhomes change the picture?
A twin or row shares at least one wall, and a shared wall cannot be dried from both sides. Water entering from the neighboring property stays in the assembly, and the owner on the dry side often has no idea where it is coming from.
Downspouts and grading make it worse. On tight lots the downspout frequently discharges within a foot or two of the foundation, and on a shared wall two houses' worth of roof water can be landing in the same place.
When Bob samples in Upper Darby, Drexel Hill, Lansdowne, or Clifton Heights, establishing whether the moisture originates on your side of the wall is often the most useful part of the report, because it determines whether the fix is yours to make.
Which Delaware County towns does Bob cover?
All 42, and they fall into three rough groups. The eastern twin and rowhome belt includes Upper Darby, Drexel Hill, Lansdowne, Clifton Heights, Darby, Darby Township, Yeadon, Folcroft, Glenolden, Norwood, Prospect Park, Sharon Hill, Aldan, Holmes, Woodlyn, and Havertown.
The central and western townships are larger-lot and more varied: Media, Swarthmore, Wallingford, Springfield, Broomall, Marple Township, Newtown Square, Radnor, Villanova, Nether Providence, Upper Providence, Glen Mills, Lima, Glen Riddle-Lima, Concordville, Ardmore's Haverford Township side, and Haverford.
The riverfront and southern end, Chester, Chester Township, Essington, Tinicum Township, Boothwyn, Brookhaven, Aston, Folsom, Ridley Park, and Ridley, brings older industrial-era housing and proximity to the Delaware River itself.
What does mold testing cost in Delaware County?
Mold testing starts from $275 and depends on how many areas need sampling rather than which town you are in or how large the house is. A single basement with an outdoor control is the typical job.
Twin and rowhome situations where the source may be on the other side of a party wall sometimes need sampling in more than one location to establish that. Bob will tell you before scheduling. There is no travel charge anywhere in the county.
What should I do before the inspection?
Leave the area as it is. No cleaning, no spraying, no repainting, and no running the dehumidifier hard the day before. Each of those changes the air sample.
Put together the water history: has the basement ever taken water and how deep, is there a sump and does it run, where do the downspouts discharge, and has the sewer lateral ever backed up. In a county where the water table sits high across whole neighborhoods, that history is usually more informative than anything visible on the wall.
If you are in a twin or a row, note anything you know about the attached property. A vacant neighbor, an abandoned downspout, or a rear yard that grades toward your shared wall all matter, because a shared wall cannot be dried from one side.
Mold Inspection & Testing in Delaware County from $275. Same inspector every time. Results in 2-3 days.
Every town Bob serves
Which Delaware County towns does Bob cover?
Bob personally handles mold testing in every Delaware County town listed here. Each has its own page with local detail on the housing stock and the moisture patterns that come with it.
- Mold testing in Broomall
- Mold testing in Clifton Heights
- Mold testing in Haverford
- Mold testing in Marple Township
- Mold testing in Media
- Mold testing in Newtown Square
- Mold testing in Radnor
- Mold testing in Springfield
- Mold testing in Swarthmore
- Mold testing in Upper Darby
- Mold testing in Wayne
- Mold testing in Havertown
- Mold testing in Drexel Hill
- Mold testing in Lansdowne
- Mold testing in Norwood
- Mold testing in Ridley Park
- Mold testing in Aldan
- Mold testing in Aston
- Mold testing in Boothwyn
- Mold testing in Brookhaven
- Mold testing in Chester
- Mold testing in Chester Township
- Mold testing in Concordville
- Mold testing in Darby
- Mold testing in Darby Township
- Mold testing in Essington
- Mold testing in Folcroft
- Mold testing in Folsom
- Mold testing in Glen Mills
- Mold testing in Glen Riddle-Lima
- Mold testing in Glenolden
- Mold testing in Holmes
- Mold testing in Lima
- Mold testing in Nether Providence Township
- Mold testing in Prospect Park
- Mold testing in Sharon Hill
- Mold testing in Tinicum Township
- Mold testing in Upper Providence Township
- Mold testing in Villanova
- Mold testing in Wallingford
- Mold testing in Woodlyn
- Mold testing in Yeadon
Looking for a different service in Delaware County? See air quality testing in Delaware County, or browse every area Bob serves.
Common questions
Delaware County mold testing questions
How much does mold testing cost in Delaware County?
Mold testing in Delaware County starts from $275, covering a walk-through, air sampling in one area, an outdoor control sample, and PRO-LAB certified lab analysis. Party wall situations sometimes need more than one sample location, and Bob quotes that before scheduling.
How long does it take to get results?
Lab results come back in 2 to 3 days and the written report goes out the same day Bob receives them, in plain language with a repair cost range where one applies. Nothing gets buried in jargon.
Who performs the inspection?
Bob does, personally, in all 42 Delaware County towns. The same inspector every time, with no rotating technicians and no subcontractors, so the person who saw your basement is the person writing your report.
My basement is always a little damp. Is that normal here?
It is common in Delaware County because of the creek drainage and the high water table across much of the county, and because the 1940s to 1960s block foundations that dominate the housing stock have little or no exterior waterproofing. Common is not the same as harmless, and it is the reason finishing a basement here without solving the water first reliably creates a mold problem.
I live in a twin. Could the mold be coming from next door?
It happens frequently. A shared wall cannot dry from both sides, so water entering from the neighboring property stays in the assembly. Establishing which side the moisture originates on is often the most valuable part of the report because it determines whose repair it is.
Should I test before finishing my basement?
Yes, particularly in this county. Framing and drywall against a damp block wall traps moisture where it feeds growth nobody sees for a year or more. Testing first tells you whether you have a water problem to solve before the money goes into the finish.
Do you cover the western townships as well as Upper Darby?
Yes, all 42 towns, from Darby and Yeadon out through Media, Swarthmore, Newtown Square, Radnor, and Glen Mills, plus the riverfront communities. Same-week appointments are normally available countywide with no travel surcharge.
Do you also do the remediation?
No. All Seasons tests and reports only. A company that both tests and remediates has a financial reason to find a larger problem than you have. Bob separates immediate safety concerns from routine maintenance so you can negotiate, accept, or walk on accurate information.
Sources and further reading
Where the Delaware County figures on this page come from
- EPA Map of Radon Zones, Pennsylvania sheet, which assigns each county its zone designation: epa.gov/radon/epa-map-radon-zones
- US EPA radon guidance and the 4 pCi/L action level: epa.gov/radon
- Pennsylvania DEP Radon Division, state testing and mitigation requirements: dep.pa.gov Radon Division
- US EPA guidance on mold and on when sampling is appropriate: epa.gov/mold/mold-testing-or-sampling
The EPA is explicit that zone designation does not tell you what any individual house will read, and recommends testing regardless of zone. Findings described on this page are from All Seasons inspections in Delaware County.
How do I schedule mold testing in Delaware County?
Same-week appointments are normally available throughout Delaware County. Call Bob directly and he will tell you what your situation actually needs.
Serving Philadelphia, Montgomery, Bucks, Chester & Delaware Counties. All major credit cards accepted.