In absolute terms, hydrostatic pressure corresponds to the pressure exerted by water on the surface of a submerged body. For a house, it is also water pressure, but on the foundations of the building. By force, it causes infiltration through the basement, therefore humidity throughout the house. Hydrostatic pressure can be due to poor drainage of rainwater, such as near a water table. Sloping land on which the house was built can also cause water to accumulate. It is quite delicate to deal with water infiltration caused by hydrostatic pressure: drainage of the ground, infiltration of resin in the walls or casing is generally a matter for professionals. You too, send us your DIY question.