Does tap water actually cause breakouts? Why or why not?
“While there has been no solid published evidence linking acne breakouts to hard water, it is entirely possible that in a subset of patients with sensitive skin, daily use of hard water along with a harsher detergent-based cleanser can irritate the skin and induce acne flare ups.”
Side note from the author: Hard water is not treated and contains dissolved minerals like magnesium and calcium. As for soft water, it is treated and only contains sodium ions.