While four parts per million are considered “safe, daily exposure over this topically and internally can be harmful. When you cleanse your face with warm water, your pores open up, letting the chlorine present in your tap water soak directly into your skin. The additional problem here is that chlorine has an extremely drying effect on the skin, essentially stripping it of its natural oils. This can cause the skin to dry out and crack, leading to chronic inflammation and premature aging. Research also reveals that chlorine present in the water coming from the spots in your home can also make dermatitis worse.