NOTE: Tables were published in 2018 and do not include 2022 PFAS Health Advisories. EPA Drinking Water Standards and Health Advisories tables (March 2018).MCLs are set as close to MCLGs as feasible using the best available treatment technology and taking cost into consideration. An MCL is the highest level of a contaminant that is allowed in drinking water. MCLGs allow for a margin of safety and are non-enforceable public health goals. An MCLG is the level of a contaminant in drinking water below which there is no known or expected risk to health. The tables also include the contaminants currently regulated under SDWA for which EPA has established Maximum Contaminant Level Goals (MCLGs) as well as Maximum Contaminant Levels (MCLs also known as drinking water standards). For example, EPA published provisional HAs for PFOA and PFOS in 2009 and interim updated HAs for PFOA and PFOS in 2022.Д®PAвЂ™s Drinking Water Standards and Health Advisories tables contain HA levels for approximately 200 contaminants based on non-cancer health effects for different durations of exposure (e.g., one-day, ten-day, and lifetime) as well as the underlying reference dose (RfD) supporting the lifetime HAs or, if applicable, the cancer risk values for drinking water contaminants. They can be updated or removed as additional information becomes available. Interim or provisional HAs are also based on health-based hazard concentrations above which action should be taken to reduce exposure to unregulated contaminants in drinking water. HAs are not to be construed as legally enforceable federal standards and are subject to change as new information becomes available.Д®PA can develop interim or provisional HA levels to provide information in response to an urgent or rapidly developing situation. EPAвЂ™s HA documents describe information about health effects, analytical methodologies, and treatment technologies. They help Tribes, states, and local governments inform the public and determine whether local actions are needed to address public health impacts in affected communities. HAs primarily serve as information to drinking water systems and officials responsible for protecting public health when emergency spills or other contamination situations occur. HA values/levels identify the concentration of a contaminant in drinking water at which adverse health effects and/or aesthetic effects are not anticipated to occur over specific exposure durations (e.g., 1 day, 10 days, a lifetime).

HA documents provide technical information on chemical and microbial contaminants that can cause human health effects and are known or anticipated to occur in drinking water. The Safe Drinking Water Act (SDWA) authorizes EPA to issue HAs for contaminants that are not subject to a National Primary Drinking Water Regulation (NPDWR) ( 42 U.S.C.

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