Water suppliers must follow government guidelines as to the amount of contaminants allowed in water. Yes, a certain level is “allowable”. Even low levels of Arsenic are allowed to be in your water. Water suppliers periodically test the water and usually publish an annual report (often found on your municipality or utility website). You can check your water conditions over the past five years with Environmental Working Group’s What’s In Your Water program. A Kinetico Water consultant can also test your water on-site and discuss the results with you.