Water can be public or private. Public water comes from municipal sources and makes up the majority of water usage. Private water is bottled and sold for profit by major corporations. Most bottled water comes from public sources like taps and is bottled and marketed as safer than tap water. However, bottled water poses environmental risks from plastic waste and may leach chemicals from plastic bottles with prolonged storage. The safety of both public and private water sources depends on location and quality of testing and treatment.