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How to Find Us
County of Los Angeles
Department of Public Health
Environmental Health
5050 Commerce Drive
Baldwin Park, CA 91706
(888) 700-9995

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Certified Backflow Testers

Important Info:
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Any individual in Los Angeles County engaged in the business or occupation of testing, repairing or installing backflow prevention devices must become a Certified Backflow Tester. The certification process and monitoring of testers is performed by the Cross Connection and Water Pollution Control Program.

To become a Certified Backflow Tester, an individual must take and pass a practical examination every two years. They are required to demonstrate their ability to test double check valve assemblies, test reduced pressure principle backflow prevention devices, inspect pressure type vacuum breakers, and evaluate spill resistant pressure vacuum breakers. Upon successful completion of the examination, the certification is valid for a two year period. To qualify for the examination, an applicant must have the necessary knowledge to test backflow prevention devices and either be employed by a California State Licensed Contractor or possess a State Contractor’s License.

Upon receipt of backflow tester application and fee payment, an examination date will be scheduled. Exams are administered approximately three times per month, on Wednesdays, in the Backflow Testing Laboratory at the Environmental Health administrative headquarters in Baldwin Park.

The fee for taking the Certified Backflow Tester Examination is $340.

The biennial review fee is $340.

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Pay for your Public Health
Permit or License
To pay for your Public Health Permit and/or License using your Credit Card (Visa, MasterCard, American Express, or Discover), Debit Card, or Electronic Check (ECheck), please visit our Payment Portal .

A convenience fee per transaction will apply. The convenience fee for Credit/Debit Cards is 2.22% with a $1.49 minimum. Electronic Check fees are only $0.49. Please have your Account ID and your Facility ID numbers from your billing statement ready. Payment will only be accepted online for the total amount owed on an account. Terms and Conditions apply. For more information about Permit and License Billing, please visit our Payment information page .
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Director of Environmental Health
Liza Frias
Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.
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