Union Township lies in southeastern Adams County between Littlestown and McSherrystown, close to Hanover. It has no attached housing and is about 90% owner-occupied, with a median home value of $334,700. Southeast on the Baltimore Pike (PA 97) toward Littlestown, then northeast, about 25 minutes from our office.
Only 8.1% of homes were built before 1940, and the median home dates from 1984. None of the homes here are attached, and about 90% are owner-occupied. Many have finished basements, central air, and a lot invested in finishes that hide moisture well.
There are no flood insurance claims on record in the township, so the risk is not rising water. It is slow moisture: a basement that runs humid all summer, a sump that fails once, or a duct system pulling damp basement air through the house. With higher home values, catching it early saves the most.
Quick answer
Union Township has about 1,269 homes, and 41.1% were built before 1980 (49.5% across Adams County). FEMA records few flood insurance claims here, so leaks, seepage and humidity are the usual sources. Published national benchmarks put a typical mold remediation project at $1,223-$3,757 (Angi) to $1,500-$6,000 (HomeGuide); a written quote after inspection sets the real price, and the first step is always finding the water.How costs break down.
How old the homes are, how many share walls, and how often water has come in, compared with Adams County and Pennsylvania.
| Measure | Union Township | Adams County | PA |
|---|---|---|---|
| Population | 3,102 | 106,115 | 13,018,639 |
| Housing units | 1,269 | 43,672 | 5,806,452 |
| Median year built | 1984 | 1980 | 1965 |
| Built before 1940 | 8.1% | 17.5% | 25.0% |
| Built before 1960 | 14.3% | 29.4% | 44.9% |
| Built before 1980 | 41.1% | 49.5% | 67.2% |
| Built 2000 or later | 14.9% | 22.3% | 14.3% |
| Single-family detached | 97.5% | 74.7% | 56.6% |
| Attached homes (rowhouse, twin, townhouse) | 0.0% | 9.3% | 18.8% |
| Mobile homes | 0.8% | 5.5% | 3.5% |
| Owner-occupied | 90.2% | 78.9% | 69.3% |
| Median home value | $334,700 | $268,500 | $254,500 |
Sources: U.S. Census Bureau, American Community Survey 2020-2024 5-year estimates, tables B01003, B25001, B25003, B25024, B25034, B25035 and B25077 (profile); FEMA OpenFEMA NFIP redacted claims, data as of 2026-09-08. Municipal claims use FEMA's NFIP community; ZIP claims use the reported ZIP code, which can cross municipal lines. ACS figures are survey estimates with margins of error, and small places have wider margins. Paid amounts are not adjusted for inflation.
A musty smell that comes from the vents when the system kicks on usually means the air handler or ducts in the basement are pulling damp air.
Trim that swells or separates from the wall in a finished basement has taken on moisture from the slab or wall behind it.
Basement carpet that smells stale after storms is absorbing moisture from the slab. The pad and tack strip underneath often have growth before the top shows anything.
Mold on the wall behind a couch, bookshelf, or bed in a lower level forms where air does not move and surfaces stay cool.
A full or rusty drain pan under the air handler, or a clogged condensate line, means water is sitting where the system can spread it.
Union Township has no flood insurance claims on record, so the risk is not rising water. It is slow moisture that builds where you cannot see it. Finished basements put drywall, carpet, and framing directly against concrete that stays cool and slightly damp, and those materials absorb moisture all summer.
Most homes here are detached and owner-occupied, with a median build year of 1984 and a median value of $334,700. Many have central air with the air handler in the basement. If the basement runs humid, the system draws that air in and can spread spores and smells through the whole house.
Higher-value finishes mean more is at stake. Catching a small damp area early, before it spreads behind walls and under flooring, keeps the cleanup small.
Union Township homes are almost all owner-occupied, none are attached, and many have finished basements and central air. The aim is to find moisture early and remove only what is necessary.
Finding hidden moisture before it damages expensive finishes, or before a sale.
An inspection with moisture readings, humidity checks, and surface temperatures finds damp spots behind finished walls before they spread. For a sale, it gives buyers and sellers a written answer about what is there.
Finished basements that need targeted removal and rebuilding.
In finished basements, we remove only the affected section of drywall, carpet, or trim under containment, dry and clean the framing, and confirm readings before anything is rebuilt.
Air handlers and ducts in damp basements.
When the air handler and ducts sit in a damp basement, they can carry musty air to every room. We clean the air handler and accessible ducts and fix the humidity around them.
Every service we offer is available in Union Township.
We take moisture readings through finished walls and floors, check humidity and surface temperatures, and look at the air handler and sump. That shows where to open up and where not to.
Under containment with HEPA filtration, we cut out wet drywall, carpet, and trim in clean sections and protect finished floors and stairs.
If the air handler or ducts are involved, they are cleaned, and the condensate pan and drain line are checked.
Framing and slab are dried until readings are normal before anything is closed up. A draining dehumidifier keeps the basement below 60% going forward.
We protect finished floors, stairs, and trim during setup and cut out wet material in clean, straight sections to make rebuilding easier.
We check the sump, the dehumidifier, and where the air handler draws its air, since all three affect whether the basement stays dry.
Start by finding out why it grew. An inspection with moisture readings shows whether it is a small, dry, past problem or an active one. That gives both sides something concrete to negotiate on, and if work is needed, a written scope and a clearance check afterward help the sale move forward.
Yes. Union Township, between Littlestown and McSherrystown, is part of our service area.
Yes, with the right choices. Keep humidity below 60% before you start, use insulation and framing details that do not trap moisture against the concrete, avoid carpet directly on the slab, and make sure the sump and drainage work. An inspection beforehand shows how damp the space really is.
Not always. The smell may be coming from the basement air the system draws in, not from the ducts themselves. We check the air handler, the ducts, and the basement humidity together and clean what is actually affected.
Mold that is found, fixed, and documented is something buyers can work with. Mold that is hidden or unexplained causes more trouble in a sale. A written scope, moisture readings, and a clearance check after the work give buyers confidence.
More answers on our mold FAQ page.
Tell us whether the basement is finished and whether the house is being bought or sold. That tells us what to look at first.
