What type of water are the water supply companies required to supply by law?

Water supply companies are typically required by law to supply potable water, which is safe for human consumption and meets established health and safety standards. This includes adhering to regulations set by local, state, and federal authorities, such as the Environmental Protection Agency (EPA) in the United States. The quality of the water must be regularly tested for contaminants and treated as necessary to ensure it is free from harmful substances. Additionally, companies must provide transparent information about the quality of the water supplied to consumers.