Allen sits between Plano and McKinney on US-75, a dense, established suburban city where most of the housing was built in phases from the late 1980s through the 2000s. That housing stock is now at the age where original plumbing and roofing systems are failing, and the city's storm exposure means hail and wind events add up year over year.
Much of Allen's housing was built between 1988 and 2005. That 20 to 35-year window is where supply line failures, water heater failures, and HVAC condensate overflows start showing up with increasing frequency. Original CPVC or copper plumbing can develop pinhole leaks that go undetected behind walls for months. Tree root intrusion into sewer lines is also common in established Allen neighborhoods, and root-intrusion sewage backups are Category 3 events that require certified cleanup.
Allen saw significant hail damage in the 2025 DFW storm season, with roofs and properties taking hits across the city, including along the US-75 and Bethany Drive corridor. Given Allen's density and tree canopy, wind events generate meaningful structural exposure.
The Watter Creek corridor through Allen creates drainage exposure for properties along its path during heavy rain. Flash flooding tends to concentrate near creek drainage systems, and properties backing up to drainage easements have higher exposure.
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