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Surface Water - Chemistry Results

Published by California State Water Resources Control Board | State of California | Metadata Last Checked: February 26, 2026 | Last Modified: 2026-02-06T23:56:25.849678
This data provides results from the [California Environmental Data Exchange Network](https://ceden.org/) (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](https://ceden.org/find_data_page.shtml)**, 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](https://data.ca.gov/dataset/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.

Resources

58 resources available

  • 2002 CEDEN Water Chemistry Data

    CSV
    Download

  • 2007 CEDEN Water Chemistry Data

    CSV
    Download

  • CEDEN Water Chemistry Data Prior to 2000

    CSV
    Download

  • 2020 CEDEN Water Chemistry Data

    CSV
    Download

  • 2013 CEDEN Water Chemistry Data

    CSV
    Download

  • 2016 CEDEN Water Chemistry Data

    CSV
    Download

  • 2011 CEDEN Water Chemistry Data

    CSV
    Download

  • 2010 CEDEN Water Chemistry Data

    CSV
    Download

  • 2009 CEDEN Water Chemistry Data

    CSV
    Download

  • 2022 CEDEN Water Chemistry Data

    CSV
    Download

  • 2017 CEDEN Water Chemistry Data

    CSV
    Download

  • 2019 CEDEN Water Chemistry Data

    CSV
    Download

  • 2023 CEDEN Water Chemistry Data

    CSV
    Download

  • 2014 CEDEN Water Chemistry Data

    CSV
    Download

  • 2026 CEDEN Water Chemistry Data

    CSV
    Download

  • 2015 CEDEN Water Chemistry Data

    CSV
    Download

  • 2005 CEDEN Water Chemistry Data

    CSV
    Download

  • 2025 CEDEN Water Chemistry Data

    CSV
    Download

  • 2000 CEDEN Water Chemistry Data

    CSV
    Download

  • 2024 CEDEN Water Chemistry Data

    CSV
    Download

  • 2006 CEDEN Water Chemistry Data

    CSV
    Download

  • 2008 CEDEN Water Chemistry Data

    CSV
    Download

  • 2004 CEDEN Water Chemistry Data

    CSV
    Download

  • 2001 CEDEN Water Chemistry Data

    CSV
    Download

  • 2003 CEDEN Water Chemistry Data

    CSV
    Download

  • 2021 CEDEN Water Chemistry Data

    CSV
    Download

  • 2018 CEDEN Water Chemistry Data

    CSV
    Download

  • 2012 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2002 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2007 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - CEDEN Water Chemistry Data Prior to 2000

    CSV
    Download

  • Data Dictionary - 2020 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2013 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2016 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2011 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2010 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2009 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2022 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2017 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2019 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2023 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2014 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2015 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2005 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2025 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2000 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2024 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2006 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2008 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2004 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2001 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2003 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2021 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2018 CEDEN Water Chemistry Data

    CSV
    Download

  • Data Dictionary - 2012 CEDEN Water Chemistry Data

    CSV
    Download

  • CEDEN Water Chemistry Data Dictionary

    PDF
    Download

  • CEDEN Water Chemistry Data (Parquet File Format - All Years)

    ZIP
    Download

  • CEDEN Water Chemistry Data (Zipped CSV - All Years)

    ZIP
    Download

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Complete Metadata
@type dcat:Dataset
accessLevel public
contactPoint 
                                            {
  "fn": "California Environmental Data Exchange Network (CEDEN)",
  "@type": "vcard:Contact",
  "hasEmail": "mailto:ceden@waterboards.ca.gov"
}
description This data provides results from the [California Environmental Data Exchange Network](https://ceden.org/) (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](https://ceden.org/find_data_page.shtml)**, 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](https://data.ca.gov/dataset/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.
distribution 
                                            [
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    "@type": "dcat:Distribution",
    "title": "2002 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2002 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/00c4ca34-064f-4526-8276-57533a1a36d9/download/waterchemistrydata_year-2002_2026-02-05.csv",
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    "description": "Water Chemistry data for year 2007 from the California Environmental Data Exchange Network (CEDEN).",
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    "describedByType": "application/json"
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    "title": "CEDEN Water Chemistry Data Prior to 2000",
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    "description": "Water Chemistry data prior to year 2000 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/158c8ca1-b02f-4665-99d6-2c1c15b6de5a/download/waterchemistrydata_prior_to_2000_2026-02-05.csv",
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    "@type": "dcat:Distribution",
    "title": "2020 CEDEN Water Chemistry Data",
    "format": "CSV",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=2eba14fa-2678-4d54-ad8b-f60784c1b234&limit=0",
    "description": "Water Chemistry data for year 2020 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/2eba14fa-2678-4d54-ad8b-f60784c1b234/download/waterchemistrydata_year-2020_2026-02-05.csv",
    "describedByType": "application/json"
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  {
    "@type": "dcat:Distribution",
    "title": "2013 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=341627e6-a483-4e9e-9a85-9f73b6ddbbba&limit=0",
    "description": "Water Chemistry data for year 2013 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/341627e6-a483-4e9e-9a85-9f73b6ddbbba/download/waterchemistrydata_year-2013_2026-02-05.csv",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2016 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=42b906a2-9e30-4e44-92c9-0f94561e47fe&limit=0",
    "description": "Water Chemistry data for year 2016 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/42b906a2-9e30-4e44-92c9-0f94561e47fe/download/waterchemistrydata_year-2016_2026-02-05.csv",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2011 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=4d01a693-2a22-466a-a60b-3d6f236326ff&limit=0",
    "description": "Water Chemistry data for year 2011 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/4d01a693-2a22-466a-a60b-3d6f236326ff/download/waterchemistrydata_year-2011_2026-02-05.csv",
    "describedByType": "application/json"
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  {
    "@type": "dcat:Distribution",
    "title": "2010 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=572bf4d2-e83d-490a-9aa5-c1d574e36ae0&limit=0",
    "description": "Water Chemistry data for year 2010 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/572bf4d2-e83d-490a-9aa5-c1d574e36ae0/download/waterchemistrydata_year-2010_2026-02-05.csv",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2009 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=5b136831-8870-46f2-8f72-fe79c23d7118&limit=0",
    "description": "Water Chemistry data for year 2009 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/5b136831-8870-46f2-8f72-fe79c23d7118/download/waterchemistrydata_year-2009_2026-02-05.csv",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2022 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=5d7175c8-dfc6-4c43-b78a-c5108a61c053&limit=0",
    "description": "Water Chemistry data for year 2022 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/5d7175c8-dfc6-4c43-b78a-c5108a61c053/download/waterchemistrydata_year-2022_2026-02-05.csv",
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  {
    "@type": "dcat:Distribution",
    "title": "2017 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=68787549-8a78-4eea-b5b9-ef719e65a05c&limit=0",
    "description": "Water Chemistry data for year 2017 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/68787549-8a78-4eea-b5b9-ef719e65a05c/download/waterchemistrydata_year-2017_2026-02-05.csv",
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    "@type": "dcat:Distribution",
    "title": "2019 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2019 from the California Environmental Data Exchange Network (CEDEN).",
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    "title": "2023 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2023 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/6f9dd0e2-4e16-46c2-bed1-fa844d92df3c/download/waterchemistrydata_year-2023_2026-02-05.csv",
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  {
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    "title": "2014 CEDEN Water Chemistry Data",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=7abfde16-61b6-425d-9c57-d6bd70700603&limit=0",
    "description": "Water Chemistry data for year 2014 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/7abfde16-61b6-425d-9c57-d6bd70700603/download/waterchemistrydata_year-2014_2026-02-05.csv",
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  },
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    "@type": "dcat:Distribution",
    "title": "2026 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2026 from the California Environmental Data Exchange Network (CEDEN).",
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  {
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    "title": "2015 CEDEN Water Chemistry Data",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=7d9384fa-70e1-4986-81d6-438ce5565be6&limit=0",
    "description": "Water Chemistry data for year 2015 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/7d9384fa-70e1-4986-81d6-438ce5565be6/download/waterchemistrydata_year-2015_2026-02-05.csv",
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    "title": "2025 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2025 from the California Environmental Data Exchange Network (CEDEN).",
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    "title": "2000 CEDEN Water Chemistry Data",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=99402c9c-5175-47ca-8fce-cb6c5ecc8be6&limit=0",
    "description": "Water Chemistry data for year 2000 from the California Environmental Data Exchange Network (CEDEN).",
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    "title": "2024 CEDEN Water Chemistry Data",
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    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=9dcf551f-452d-4257-b857-30fbcc883a03&limit=0",
    "description": "Water Chemistry data for year 2024 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/9dcf551f-452d-4257-b857-30fbcc883a03/download/waterchemistrydata_year-2024_2026-02-05.csv",
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  {
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    "title": "2006 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2006 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/a31a7864-06b9-4a81-92ba-d8912834ca1d/download/waterchemistrydata_year-2006_2026-02-05.csv",
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    "title": "2008 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2008 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/c587a47f-ac28-4f77-b85e-837939276a28/download/waterchemistrydata_year-2008_2026-02-05.csv",
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    "title": "2004 CEDEN Water Chemistry Data",
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    "description": "Water Chemistry data for year 2004 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/c962f46d-6a7b-4618-90ec-3c8522836f28/download/waterchemistrydata_year-2004_2026-02-05.csv",
    "describedByType": "application/json"
  },
  {
    "@type": "dcat:Distribution",
    "title": "2001 CEDEN Water Chemistry Data",
    "format": "CSV",
    "mediaType": "text/csv",
    "describedBy": "https://data.ca.gov/api/action/datastore_search?resource_id=cec6768c-99d3-45bf-9e56-d62561e9939e&limit=0",
    "description": "Water Chemistry data for year 2001 from the California Environmental Data Exchange Network (CEDEN).",
    "downloadURL": "https://data.ca.gov/dataset/28d7a81d-6458-47bd-9b79-4fcbfbb88671/resource/cec6768c-99d3-45bf-9e56-d62561e9939e/download/waterchemistrydata_year-2001_2026-02-05.csv",
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  },
  {
    "@type": "dcat:Distribution",
    "title": "2003 CEDEN Water Chemistry Data",
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    "mediaType": "application/zip",
    "description": "This resource contains all water chemistry data available from the CEDEN database, in the [Apache Parquet file format]((https://parquet.apache.org/)). The data is partitioned by year.

Parquet is a free and open source data storage format that allows for fast and efficient processing of large datasets. It is compatible with a variety of data analysis platforms, including the R and Python programming languages, through the [Apache Arrow platform](https://arrow.apache.org/). An example showing how to use this data with the R programming language is available [here](https://gist.github.com/daltare/209acf0789b4f1bdec272c323ba45315).",
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]
identifier 28d7a81d-6458-47bd-9b79-4fcbfbb88671
issued 2019-08-10T04:04:52.982478
keyword 
                                            [
  "Assessment",
  "Benthic",
  "Bioassessment",
  "Bivalves",
  "CEDEN",
  "Contaminant",
  "Organisms",
  "Pollutant",
  "Sediment",
  "Surface Water",
  "Taxonomy",
  "Water Quality",
  "fish",
  "monitoring",
  "water quality monitoring"
]
modified 2026-02-06T23:56:25.849678
publisher 
                                            {
  "name": "California State Water Resources Control Board",
  "@type": "org:Organization"
}
theme 
                                            [
  "Water"
]
title Surface Water - Chemistry Results

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