Table of the National Primary Drinking Water Regulations (NPDWRs or primary standards) that are legally enforceable standards that apply to public water systems.
The National Primary Drinking Water Regulations are a set of legally enforceable standards established by the Environmental Protection Agency (EPA) to protect public health by limiting the levels of contaminants in drinking water.
The regulations cover over 90 contaminants, including microorganisms, disinfectants, disinfection byproducts, and inorganic and organic chemicals.
Public water systems are required to comply with these regulations and regularly monitor their water quality to ensure that it meets the standards set by the EPA.
