On January 1, 2023, NSF/ANSI/CAN 600, Health Effects Evaluation and Criteria for Chemicals in Drinking Water, will go into effect. This standard, which is used in conjunction with NSF/ANSI/CAN 61, is laying out the new allowable concentrations for some key chemicals that are commonly used to formulate solvent-based lining materials for potable water storage tanks. The chemicals in question are xylene, ethylbenzene, and toluene. Each of these chemicals are seeing significant reductions in their allowable concentrations under this standard. As a result, many commonly-specified products that come in contact with drinking water will no longer be able to be used in these applications once the standard goes into effect.