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    • This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

    Surface Water - Chemistry Results

    Metadata Updated: March 23, 2026

    This data provides results from the California Environmental Data Exchange Network (CEDEN) for field and lab chemistry analyses. The data set contains two provisionally assigned values (“DataQuality” and “DataQualityIndicator”) to help users interpret the data quality metadata provided with the associated result.

    Due to file size limitations, the data has been split into individual resources by year. The entire dataset can also be downloaded in bulk using the zip files on this page (in csv format or parquet format), and developers can also use the API associated with each year's dataset to access the data.

    Users who want to manually download more specific subsets of the data can also use the CEDEN Query Tool, which provides access to the same data presented here, but allows for interactive data filtering.

    NOTE: Some of the field and lab chemistry data that has been submitted to CEDEN since 2020 has not been loaded into the CEDEN database. That data is not included in this data set (and is also not available via the CEDEN query tool described above), but is available as a supplemental data set available here: Surface Water - Chemistry Results - CEDEN Augmentation. For consistency, many of the conditions applied to the data in this dataset and in the CEDEN query tool are also applied to that supplemental dataset (e.g., no rejected data or replicates are included), but that supplemental data is provisional and may not reflect all of the QA/QC controls applied to the regular CEDEN data available here.

    Access & Use Information

    Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

    Downloads & Resources

    Dates

    Metadata Created Date July 23, 2021
    Metadata Updated Date March 23, 2026

    Metadata Source

    Harvested from State of California

    Other Data Resources

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date July 23, 2021
    Metadata Updated Date March 23, 2026
    Publisher California State Water Resources Control Board
    Maintainer
    Identifier 28d7a81d-6458-47bd-9b79-4fcbfbb88671
    Data First Published 2019-08-10T04:04:52.982478
    Data Last Modified 2026-03-04T18:38:31.508128
    Category Water
    Public Access Level public
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Harvest Object Id 7234924b-b069-4411-acb2-efbcef8354b1
    Harvest Source Id 3ba8a0c1-5dc2-4897-940f-81922d3cf8bc
    Harvest Source Title State of California
    Source Datajson Identifier True
    Source Hash 84896c4ed568a807bc87631d19a45d668066a469f24613e39a9761302bd4f0f3
    Source Schema Version 1.1

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