Check for the Spa's License and Registration
While there's no universal code or set of regulations for day spas, most states in the U.S. have certain licensing requirements for them. Typically, these require spa owners (and possibly employees) to pass background checks, submit the spa to regular health inspections, and ensure that any medical procedures are performed by trained and licensed individuals. Your state attorney general's Web site is usually to go-to place for this kind of information. You can also ask spa staffers about them about it once you arrive there.
Medical spas, which might offer microdermabrasion or botox injections, may have more stringent licensing requirements. Even if they don't, ask who performs these more advanced procedures and if there's a doctor on the premises supervising at all times. Make sure that you also ask how old the spa's equipment is. Obviously, newer is better, but an older piece of equipment can be fine if it's well-maintained.
Our last tip for picking a day spa will help you separate myth from fact.