The phrase "unregulated chemicals" refers to substances that do not have any rules or guidelines in place to control or monitor their production, use, or safety. Full definition
A three - year study of the nation's drinking water quality has found more than 200 unregulated chemicals in the tap water of 45 states. (scientificamerican.com)
He says unregulated nicotine levels also mean unregulated chemicals. (wamc.org)
The annual water quality reports that utilities are required to send customers provide a partial picture, the study says, as they contain no information on unregulated chemicals. (scientificamerican.com)