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Last Edited: 3/31/2013

Drinking Water Quality: Metadata

The following three datasets were used to derive the statewide measures displayed on the Drinking Water Quality Data page:

  • Annual measures: This indicator area includes yearly summaries of concentrations for arsenic and nitrate, 1999-2008.
  • Quarterly measures: This indicator area includes quarterly summaries of concentrations for arsenic and nitrate, 1999-2008.
  • Water system inventory: This table includes general information about each community water system in California.

See the metadata documents California Drinking Water Quality Sampling Results 1999-2011 and California Community Water Systems Inventory Dataset 2011 to understand the new water quality sampling datasets that are used to derive nationally consistent measures on the CDC portal as of Winter 2013.

See the metadata documents California Drinking Water Quality Sampling Results 1999-2012 and California Community Water Systems Inventory Dataset 1999-2012 to understand the new water quality sampling datasets that will be used to derive nationally consistent measures on the CEHTP and CDC portals in Fall 2013.