Some EPDM liners are specifically designed for use with drinking water, and aren't manufactured with any additives that could possibly contaminate the water. EPDM is commonly used in water storage and transport. Ensure that the liner you're choosing is specifically designed and labeled as safe for this purpose. Some EPDM liners may contain additives or chemicals that could leach into the water or contaminate it in another way.
Make sure to follow all reccomended installation and maintenance procedures to ensure the liner remains free from contamination and maintains its integrity over time. This may include reglar inspections and cleaning, as well as proper filtration and treatment of the water itself. Overall, with proper care and attention, EPDM liners can be an effective and safe option for holding potable water in a variety of applications.
