This map collected data from both the California State Water Resources Control Board (from Jan. 1, 2017 to Sept. 24, 2020) and several districts that conducted their own water testing, such as Oakland Unified, which recently published 2024 data. Compared to the map EdSource published in 2018, this map has added active lead levels at school sites as well as the number of fixtures that have been tested. California law requires schools to take action if lead levels in their drinking water exceed 15 parts per billion (ppb). Data is updated as of June 27, 2024.
Note: Some of the data records may not be updated regularly on school district websites. To confirm results of lead testing, please contact your local school directly.
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