Primary standards are set to protect the health of the public from substances in the water that may be harmful to humans if consumed over a long period of time.
Secondary standards refer to the aesthetic qualities of water, such as taste, odor and clarity.
California standards must be at least as stringent as federal standards, but are often more stringent. To help you better understand this report, the definitions for the various terms are shown below. The level of a contaminant in drinking water below which there is no known or expected risk to health. PHGs are set by the California Environmental Protection Agency and were created in 1998. The level of a contaminant in drinking water below which there is no known or expected risk to health.