Compilation of lithologic data from selected well completion reports submitted to the California Department of Water Resources (ver. 2.0, June 2024)

This data release was prepared as part of an agreement between the California Department of Water Resources (DWR) and the United States Geological Survey (USGS) to support the Sustainable Groundwater Management Act (SGMA). Of the many components of that agreement there is a specific task requiring the Enhancement of Digital Well Completion Reports. Well-completion reports (WCRs) contain information about the wells, such as construction characteristics and lithologic data that is very valuable to SGMA. The data set presented here is a compilation of lithologic information transcribed verbatim from a subset of WCRs contained in DWRs Online System for Well Completion Reports (OSWCR). The format of the lithologic descriptions follows DWRs “free form” entry method which allows for any material description to be entered without standardization. The lithologic descriptions for all depth intervals recorded by the driller on the WCR are captured as is with no regularization or correction for typos or spelling errors. Some degree of data processing maybe required by a user of this dataset depending on its intended use. This data release is intended to be updated as new WCRs are transcribed over time. Featured in this data release are WCRs located primarily along the length of the California Aqueduct in the Central Valley of California. Future updates may also be focused on specific areas of California to assist current or future research in support of SGMA. This dataset is for information purposes only. All attributed values should be verified by reviewing the original WCR which can be retrieved from the California Open Data Portal WCR website: https://data.ca.gov/dataset/well-completion-reports

California Water Code Section 13752 allows for the release of redacted copies of well completion reports to the public. DWR is the authoritative source of these data.