Surface Water - Chemistry Results
This data provides results from chemistry and field analyses, from the California Environmental Data Exchange Network (CEDEN). 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. Example R code using the API to access data across all years can be found [here](https://gist.github.com/daltare/2de1517ad1e315c4b1cad01278de96dd). Users who want to manually download more specific subsets of the data can also use the CEDEN query tool, at: https://ceden.waterboards.ca.gov/AdvancedQueryTool
Data files
| Data title and description | Access data | File details | Last updated |
|---|---|---|---|
CEDEN Water Chemistry Data (Zipped CSV - All Years) Zipped CSV file containing all water chemistry data from the California Environmental Data Exchange Network (CEDEN). | Download | ZIP 500.73 MB | 01/13/21 |
CEDEN Water Chemistry Data (Parquet File Format - All Years) 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). | Download | ZIP 326.28 MB | 02/01/21 |
2025 CEDEN Water Chemistry Data Water Chemistry data for year 2025 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 7.30 MB | 02/04/25 |
2024 CEDEN Water Chemistry Data Water Chemistry data for year 2024 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 111.41 MB | 02/05/24 |
2023 CEDEN Water Chemistry Data Water Chemistry data for year 2023 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 325.44 MB | 04/26/23 |
2022 CEDEN Water Chemistry Data Water Chemistry data for year 2022 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 292.31 MB | 04/14/22 |
2021 CEDEN Water Chemistry Data Water Chemistry data for year 2021 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 316.11 MB | 01/22/21 |
2020 CEDEN Water Chemistry Data Water Chemistry data for year 2020 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 183.99 MB | 01/13/21 |
2019 CEDEN Water Chemistry Data Water Chemistry data for year 2019 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 399.55 MB | 01/13/21 |
2018 CEDEN Water Chemistry Data Water Chemistry data for year 2018 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 482.98 MB | 01/22/21 |
2017 CEDEN Water Chemistry Data Water Chemistry data for year 2017 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 537.20 MB | 01/22/21 |
2016 CEDEN Water Chemistry Data Water Chemistry data for year 2016 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 699.72 MB | 01/22/21 |
2015 CEDEN Water Chemistry Data Water Chemistry data for year 2015 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 582.36 MB | 01/22/21 |
2014 CEDEN Water Chemistry Data Water Chemistry data for year 2014 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 561.38 MB | 01/23/21 |
2013 CEDEN Water Chemistry Data Water Chemistry data for year 2013 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 620.68 MB | 01/23/21 |
2012 CEDEN Water Chemistry Data Water Chemistry data for year 2012 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 569.85 MB | 01/23/21 |
2011 CEDEN Water Chemistry Data Water Chemistry data for year 2011 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 414.83 MB | 01/23/21 |
2010 CEDEN Water Chemistry Data Water Chemistry data for year 2010 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 387.56 MB | 01/23/21 |
2009 CEDEN Water Chemistry Data Water Chemistry data for year 2009 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 327.74 MB | 01/27/21 |
2008 CEDEN Water Chemistry Data Water Chemistry data for year 2008 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 509.42 MB | 01/27/21 |
2007 CEDEN Water Chemistry Data Water Chemistry data for year 2007 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 367.50 MB | 01/27/21 |
2006 CEDEN Water Chemistry Data Water Chemistry data for year 2006 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 333.99 MB | 01/27/21 |
2005 CEDEN Water Chemistry Data Water Chemistry data for year 2005 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 373.96 MB | 01/27/21 |
2004 CEDEN Water Chemistry Data Water Chemistry data for year 2004 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 282.54 MB | 01/27/21 |
2003 CEDEN Water Chemistry Data Water Chemistry data for year 2003 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 298.66 MB | 01/27/21 |
2002 CEDEN Water Chemistry Data Water Chemistry data for year 2002 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 264.69 MB | 01/27/21 |
2001 CEDEN Water Chemistry Data Water Chemistry data for year 2001 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 175.20 MB | 01/27/21 |
2000 CEDEN Water Chemistry Data Water Chemistry data for year 2000 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 125.87 MB | 01/28/21 |
CEDEN Water Chemistry Data Prior to 2000 Water Chemistry data prior to year 2000 from the California Environmental Data Exchange Network (CEDEN). | Download | CSV 774.43 MB | 08/10/19 |
Supporting files
| Data title and description | Access data | File details | Last updated |
|---|---|---|---|
CEDEN Chemistry Data Dictionary Data dictionary for the CEDEN chemistry data. | Download | PDF 90.43 KB | 08/10/19 |