Although city water (or water from a community water system) is usually treated to some degree before it reaches your home, most city water is still hard and contains some levels of contaminants. Water treatment plants are required to provide water to regulated standards, but it’s becoming harder for them to meet these standards — and are they good enough for you? Regardless of the water quality when it leaves the plant, water must travel through an aging distribution system or old pipes and can change along the way to your faucet.
How water is used in the home often determines how it will be treated.
