Surface Water Database (SURF)

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The Department of Pesticide Regulation (DPR) maintains a Surface Water Database (SURF) containing data from a wide variety of environmental monitoring studies designed to test for the presence or absence of pesticides in California surface waters. As part of DPR's effort to provide public access to pesticide information, this site provides access to data from DPR's Surface Water Database.

General description of the database

Access the data

What's new?

The recent update of SURF database was released in January 2019. This update features a major effort to remove duplicate records mostly for the data from non-DPR sources. All qualified pesticide data from CEDEN and NWIS (California sites) that were available for download in May 2018 have been incorporated into SURF.

The 2018 annual update included DPR monitoring studies conducted in 2016 and 2017 as well as new studies from CEDEN and NWIS that were uploaded after the 2017 update. SURF now contains over 760,000 results of water samples and over 79,000 results of sediment samples. The most recent water and sediment sample were taken in March, 2018.

Submitting Data to DPR's SURF Database

DPR encourages submission of surface water monitoring data from any organization that conducts studies designed to monitor for the presence of pesticides in California surface water. DPR accepts data submissions that fulfill the minimum requirements shown below. Data in electronic format (i.e., spreadsheet, txt, or csv format) require:

  • Name of sampling agency or organization
  • Date that each sample was collected
  • Date of each sample analysis
  • County where samples were taken
  • Detailed sampling location information (including latitude and longitude, with datum specified (NAD83, WGS84, etc.)
  • Name or description of water body sampled
  • Name of the active ingredient analyzed
  • Concentration detected (with unit of measurement)
  • Limit of quantitation (with unit of measurement)
  • Description of analytical QA/QC plan, or statement that no formal plan exists

For content questions, contact:
Xuyang Zhang, Ph.D.
1001 I Street, P.O. Box 4015
Sacramento, CA 95812-4015
Phone: (650) 493-1082