Welcome to the State of California 

Residential Water Treatment Devices

Last Update: August 18, 2014

Current Listing of Registered Devices

Performance Data Sheets for Registered Devices

For each water treatment device, information is provided on a document called the Product Data Sheet (PDS).   The PDS covers the following:

  1. Which contaminants the device has been certified to reduce.
  2. How many gallons of water can be produced by the device per day.
  3. Limitations and disclaimers on the use of the device.

 For additional information and to view the Product Data Sheet click the link below.

Statutory Changes in the Device Program

  • Assembly Bill 119 (PDF)Opens in new window.was signed into law in 2013, making significant changes to the Water Treatment Device Program, The statute's major provisions became effective January 1, 2014. See "Information for Manufacturers" below.

Residential Water Treatment Devices

If you are thinking of buying a home water treatment device, you are probably concerned about your drinking water.  Some common concerns are:

  • The appearance or taste of the water such as the odor of chlorine or an unpleasant mineral flavor.
  • Worries about a specific contaminant that might be in the water.
  • A family member may be vulnerable to illness due to a weakened immune system or other factor.
  • Excessive staining or deposits on your plumbing. 

Whatever the reason, you want to be sure that the device you are using will meet your needs.  You want to be sure that the device will reduce contaminants as stated on the packaging or advertisements. 

The goal of the State of California Water Treatment Device Registration Program is to ensure that devices sold in California have been independently evaluated and tested to reduce ‘health-related’ contaminants as claimed by the packaging.   Health related contaminants include:

  • Nitrates
  • Arsenic
  • Bacteria, virus and cysts
  • Organic chemicals (such as by-products of chlorination)

What does California Registration mean?

This registration means that devices sold in California that make health-related claims have been certified by an independent, accredited certification organization.  This certification includes extensive water quality testing in accordance with national standards.  Accreditation means that the organization and their testing laboratory have the proper ability, personnel and equipment to fully evaluate these devices. 

Manufacturers that wish to have their devices registered for sale in California must provide proof of the independent certification and other information on each device.  The California Registration program is designed to verify this certification and ensure that literature provided with each model adequately informs the customer.  The Registration program monitors the marketplace for illegal sales of devices as well as misleading advertisement for ANY water treatment device.  

These independent certification organizations include NSF and WQA.  The websites of both of these organizations provide helpful information on choosing a home water treatment device. 

Important Considerations

Private Well Supplies

If your water comes from a private well (serving just your home, typically), you (or the property owner) will need to make testing arrangements of the well water on your own.  There may be some testing data available in county environmental health department files but usually not.   Here are some resources regarding private wells that may be helpful. 

Your local County Environmental Health Department may be able to help you to understand test results.  They may also have information on protecting your well from contamination.    

Information for Manufacturers

For More Information

For more information about residential water treatment devices, contact us at:

  • Residential Water Treatment Device Registration Unit
    Division of Drinking Water
    State Water Resources Control Board
    P.O. Box 997377, MS 7417
    Sacramento, CA 95899-7377
    (916) 449-5600 (phone)
    (916) 449-5656 (fax)
Last modified on: 8/18/2014 9:14 AM