Hydrostatic pressure is one of the common reasons for water penetrating into your home. When the water table or ground water surrounding your house rise, whether it is because of heavy rain or clogged drain, it exerts force into the walls. This pressure could push water through cracks in walls, floors and wall-floor joints. It could also push water vapour making the air inside your home, humid.
Moisture and humidity could also foster the growth or mold and mildew. Fungi growth could cause respiratory problems, allergy, infection and toxicity in residents. Mold exposure can trigger asthma and lung bleeding.
To make sure that this would not happen, there should be a functioning footer drain outside your home. It would remove excess water and divert it far from your home. If you already have one, regular cleaning and clog removing is important.