Because the water is arriving from the ground, not from your plumbing. The Jordan River runs high in the melt, groundwater rises across the low bench, and pressure at the floor wall joint pushes water through cracks and joints that hold fine at normal water tables. The signature is timing: wet in the melt weeks, dry by summer, worst in the lowest rooms. The home side answers are drainage and grading outside, a healthy sump with a backup inside, and a coverage check, because ground water is the loss standard policies most often leave to an endorsement.
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