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.
Boise basements meet spring in two ways: snowmelt against the foundation in March, and irrigation water from May on. If your basement is damp only in irrigation season, the water table is not your problem - your yard water is.
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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