Lake Heritage: Moisture and Mold in a Lake Community Southeast of Gettysburg

By John Calhoun, owner of Mold Remediation Gettysburg PA · Updated October 20, 2026

Lake Heritage is about two miles southeast of Gettysburg, built around a 154-acre man-made lake. According to the association’s own history, the community was developed by a Springfield, Massachusetts company and incorporated in June 1965, and the lake didn’t fill to capacity until March 1967. Today it’s nearly all owner-occupied homes, most of them built from the 1970s onward, so its moisture problems look more like newer-house problems than old-house ones.

Lake Heritage by the numbers

Lake Heritage is a Census-designated place that crosses parts of Straban, Mount Joy and Mount Pleasant townships. These are American Community Survey estimates for 2020 to 2024.

Lake Heritage is a small place for a survey, and the margins of error are wide (the total alone is plus or minus 246 homes). Treat the shares as a rough picture. The comparison with the borough and the townships is on the Gettysburg housing data page.

Electric and propane heat

Nearly half of Lake Heritage homes heat with electricity and about a quarter with propane, according to the Census. Utility gas is rare there. Two things follow for moisture. If the heating and cooling ducts run through a crawl space, cold ducts in humid summer air can sweat, and that water drips onto insulation and the ground below. And a portable propane or kerosene heater without a vent to the outside adds water vapor to the room as it burns, which is worth knowing if one room stays damp.

Water around the foundation

Being near a lake doesn’t make a basement wet. Water around the foundation does. What I’d check in any house on a lot like these:

• Where the roof water goes. Downspouts that dump next to the foundation are a common problem and one of the cheapest to fix.
• How the yard slopes. If the ground falls toward the house, rain runs toward the walls instead of away.
• A walk-out or built-into-the-hill lower level, if you have one. The uphill wall has soil against it and takes the most water.
• Window wells. A well that fills with leaves or has no drain becomes a small pond against the wall; window well leaks covers the fix.

Tight houses and big equipment

Newer houses are often sealed tight and fitted with heating and cooling sized bigger than the house needs, and an oversized air conditioner leaves moisture behind. If your Lake Heritage house is newer and feels clammy in summer, why brand-new houses get damp explains what to check.

Crawl spaces and lower levels

If your house has a crawl space or a finished lower level, give it a regular look. A crawl space with bare or torn plastic over damp ground sends moisture into the house above, and a finished lower level can hide a wet wall behind drywall and carpet. If the lower level smells musty, take a moisture reading before you take anything apart. Vapor barrier vs. encapsulation explains crawl space options, and sizing a dehumidifier explains how big the machine needs to be.

Houses that sit closed up

If your house sits empty for weeks while you travel, it becomes the place where a small leak runs longest before anyone sees it. Summer humidity in a closed house with the air conditioning off can do the rest. Keep some heat on in winter, keep a self-draining dehumidifier running in the lowest level, leave interior doors open and have someone look in after big storms.

A lake house worth keeping dry

None of this is unusual or expensive to manage once you know where your water goes. I’m John Calhoun, and the questions I ask in a Lake Heritage house are the same ones I ask anywhere: where’s the moisture coming from, and how do we prove it’s gone when we’re done? See mold remediation in Gettysburg, PA and my mold services for how that works.