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Basement Flooding in Allentown: What Every Homeowner Should Know

Steel truss bridge that spans the Lehigh River surrounded by trees under a clear blue sky.

Allentown, PA, is known for its rich history, and distinct geography—from the Little Lehigh Creek winding through the city to the rolling hills of Lehigh Valley. But beneath that charm lies a very real problem for homeowners: basement flooding in Allentown.

Whether you live in the Old Allentown Historic District or the tree-lined neighborhoods of West End, flooding is a common concern. That said, it should never be ignored. A wet basement doesn’t just mean soggy boxes or musty smells—it can lead to serious structural damage.

The good news? Groundworks offers proven, permanent solutions for basement waterproofing Allentown residents can rely on.

Why Basement Flooding Happens in Allentown

Flooding in Allentown isn’t just bad luck—it’s often the result of outdated home construction combined with changing climate patterns. Let’s look at the numbers:

  • Over 7,800 homes in Allentown were built before 1960, including:
    • 3,518 built before 1939
    • 1,161 in the 1940
    • 3,219 in the 1950s

These homes frequently lack modern drainage and waterproofing systems. Instead, they may have:

  • No sump pump
  • Downspouts draining into outdated footing tile systems
  • Cracked or porous masonry basement walls
  • Foundation drains tied into aging city sewer lines

Homeowners often face:

  • Higher risks of sewer backups
  • Basement leaks from soil saturation
  • Ongoing mold and deterioration if not addressed

These facts highlight some of the most common basement flooding causes in Allentown, and they reinforce the need for updated protection systems.

How Water Gets Into Allentown Basements

Here are the most common entry points for water in local basements:

standing groundwater in yard
  • Surface water runoff from improper yard grading or overflowing gutters
  • Subsurface groundwater entering through walls and floors due to hydrostatic pressure
  • Foundation cracks from freeze-thaw cycles and natural settling
  • Sewer backups in neighborhoods with older, overburdened infrastructure
  • Poorly designed window wells or landscaping that directs water toward the home

Understanding these sources is key to waterproofing your basement and protecting your home long-term.

Signs Your Basement Has a Water Problem

Even small warning signs may indicate a bigger issue:

If you’ve noticed one or more of these signs, it’s time to act before spring and summer storms arrive.

DIY Waterproofing Tips for Allentown Homeowners

While professional help is often needed, there are simple DIY steps you can take today:

cleaning and repairing gutters
  • Extend downspouts at least 10 feet from your foundation
  • Clean gutters regularly to prevent overflow
  • Regrade landscaping to slope away from your home
  • Install window well covers to keep rain out

These measures can reduce risk, but they won’t address structural issues or deep water intrusion.

Professional Waterproofing Solutions That Work

For a permanent fix, Groundworks offers full-service basement waterproofing Allentown homeowners trust:

Groundworks employee installing interior drainage

These modern systems are especially important for retrofitting older homes in Allentown.

Take Action Before the Next Big Storm

Spring and summer storms in Pennsylvania can bring several inches of rain in just a few hours. Without protection, that water can quickly overwhelm your basement. The best time to act is now before flooding damages your home.

Groundworks has helped thousands of local homeowners eliminate wet basement problems and safeguard their homes for the future. Our team knows the soil, the city layout, and the unique challenges of basement flooding in Allentown.

Schedule your free inspection today, and take the first step toward a dry, healthy basement.

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Leah Leitow

Leah Leitow

Content Writer

Leah is a Content Writer for Groundworks with nearly ten years of experience working in the foundation repair industry. Her experience ranges from working with homeowners to find the right solution to training inspectors and staff. In her background as a Michigan journalist, she gained invaluable insight into people's lives throughout our state. Leah lives in metro Detroit with her husband and two sons.