Many older homes lack sump pumps primarily because building codes and construction practices at the time did not mandate sub-slab perimeter drainage systems, or because older foundations were built with stone or brick materials designed to "breathe" and drain moisture naturally rather than trap it behind waterproof membranes. Additionally, older neighborhoods often had lower water tables or more permeable surrounding soils that naturally prevented heavy hydrostatic pressure buildup against foundation walls. Verification: Inspect your basement walls and flooring for signs of perimeter drain tile integration.
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