It depends on the source. A single leaking crack in a poured wall is fixed with injection ($400 to $1,500). But if water also enters at the cove joint and through the floor, the home has hydrostatic pressure and needs interior drainage. We diagnose the full pattern before quoting.
More detail
Crack injection seals one specific path: a vertical or diagonal crack in a poured-concrete wall, filled the full depth with polyurethane or epoxy resin from the inside. For a newer poured-wall home (common in Mason, West Chester, and the suburbs) where a single crack is the documented source, injection is a fast, economical, low-disruption permanent fix and it carries a warranty against re-leaking at that crack. The mistake is treating injection as a cure for hydrostatic seepage. If the basement also takes water at the cove joint (the floor-to-wall seam) and up through the floor after heavy rain, the home has water under pressure at footer depth and the water will simply find another path after you seal the crack. That basement needs an interior drainage system to relieve the pressure, not just an injection. This is why we diagnose the full leak pattern before quoting: we look at where water actually appears, whether multiple walls are involved, whether the floor is taking on water, the soil and grade outside, and the foundation type. Stone-and-block foundations cannot be crack-injected meaningfully at all (there is no monolithic wall to inject) and almost always need interior drainage with a wall membrane. Getting this diagnosis right is the single biggest predictor of whether a repair actually keeps the basement dry, and it is why we never quote crack injection sight-unseen for a basement that is taking on water in more than one place.