Purified water can mean many things. The level of purification can vary depending on the purification system used. Many bottled water companies that sell spring water have tested the spring(s) they use for a specific characteristics. Purified often starts as tap water then is purified.

Your local water district should have a table available that lists the elements and compounds in your water. They are required to test it by federal standards. Our water district sends the test results out each year.