If you have well water? That's probably better. Dr. Faulkinham says if you have to buy water, spring water has less MAC than other bottled water. I carry Lifestraw wherever I go and that will kill MAC in the water and boil water at home. I just prefer the taste of boiled water better and that's why I do so. I will have an occasionally sparking water or something, but not daily. I know Sue the Admin, isn't concerned about the water she drinks. You have to figure out what you think is best for you to keep your exposure down.