California Office of Environmental Health Hazard Assessment
The mission of the Office of Environmental Health Hazard Assessment (OEHHA) is to protect and enhance public health and the environment by scientific evaluation of risks posed by hazardous substances.
Datasets
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California Office of Environmental Health Hazard Assessment
SB 535 Disadvantaged Communities 2026CalEPA issued previous Disadvantaged Communities (DAC) designations in 2014, 2017, and 2022. The 2026 DAC designation builds on lessons learned from previous designations, utilizes the latest and best available data, and considers factors related to data unavailability. CalEPA defines communities in terms of census tracts and includes the following in the 2026 DAC designation: - Census tracts with the highest 25 percent of CalEnviroScreen 5.0 overall scores. - Census tracts with the highest 5 percent of CalEnviroScreen 5.0 pollution burden scores. - Census tracts that overlap at least 25 percent with a 2022 DAC-designated census tract based on CalEnviroScreen 4.0. - Lands under the control of federally recognized tribes, with updated tribal boundaries data. For more information, visit the CalEPA DAC website: https://calepa.ca.gov/programs/dac2026/
California Office of Environmental Health Hazard Assessment
Draft CalEnviroScreen 5.0OEHHA is announcing the availability of draft CalEnviroScreen 5.0 for public comment. CalEnviroScreen is a mapping tool used to identify California communities disproportionately burdened by multiple sources of pollution. The 5.0 draft update reflects the newest census tract geography, updates all existing indicators, and adds two new indicators. To view the updated maps and learn about the proposed changes, please visit the draft CalEnviroScreen 5.0 website. Get Involved: - Informational Webinar: We will hold an informational webinar on February 2, 2026, to provide information on the technical updates to CalEnviroScreen and how to get involved. Register for the webinar on Zoom. - Public Workshops: Statewide and regional sessions will be held in February to share updates and gather feedback. Registration details will be shared soon at the link below. - Public Comment Period: Written comments on the draft CalEnviroScreen 5.0 may be submitted until April 1, 2026. Visit the Get Involved page for more details on these feedback opportunities and how to register. If you have additional questions, please contact CalEnviroScreen@oehha.ca.gov.
California Office of Environmental Health Hazard Assessment
CalEnviroScreen 5.0CalEnviroScreen is a mapping tool that helps identify California communities that are most affected by many sources of pollution, and where people are often especially vulnerable to pollution’s effects. CalEnviroScreen uses environmental, health, and socioeconomic information to produce scores for every census tract in the state. The scores are mapped so that different communities can be compared. An area with a high score is one that experiences a much higher pollution burden than areas with low scores. CalEnviroScreen ranks communities based on data that are available from state and federal government sources.
California Office of Environmental Health Hazard Assessment
CalEnviroScreen 4.0CalEnviroScreen is a mapping tool that helps identify California communities that are most affected by many sources of pollution, and where people are often especially vulnerable to pollution’s effects. CalEnviroScreen uses environmental, health, and socioeconomic information to produce scores for every census tract in the state. The scores are mapped so that different communities can be compared. An area with a high score is one that experiences a much higher pollution burden than areas with low scores. CalEnviroScreen ranks communities based on data that are available from state and federal government sources.
California Office of Environmental Health Hazard Assessment
CalEnviroScreen 3.0 ResultsCalEnviroScreen is a mapping tool that helps identify California communities that are most affected by many sources of pollution, and where people are often especially vulnerable to pollution’s effects.
CalEnviroScreen uses environmental, health, and socioeconomic information to produce scores for every census tract in the state.
The scores are mapped so that different communities can be compared. An area with a high score is one that experiences a much higher pollution burden than areas with low scores.
CalEnviroScreen ranks communities based on data that are available from state and federal government sources.