Below-grade spaces get wet from four directions: through the floor when the water table rises, through walls where grading pushes rain toward the foundation, down window wells, and from a sump pump that fails at the exact moment it matters. Each source has a different fix, which is why 'my basement is damp' needs a look, not a guess.
Richardson translation of this guide: the damp space to read here is the slab edge. Efflorescence at a baseboard, a floor that stays cool and dark along one wall, or a musty room with no plumbing above it points at moisture arriving from below, either a slab leak feeding it or clay giving back a flood. Read it after two dry days. Still damp then, and the meter test decides whether the house's own lines are the source.
Warning signs in order of seriousness: a musty smell that never leaves, efflorescence (white mineral lines) on foundation walls, rust at the base of the furnace or water heater, and stored cardboard going soft. Standing water is the last sign, not the first.
A battery backup for the sump pump and a high-water alarm are the two cheapest upgrades in this whole guide. Pumps fail during storms because storms are when power fails - plan for the coincidence.
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