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Welcome to Water Opcert School's FREE downloads page. The following links are provided to assist operators with the certification testing and renewal process. If you have suggestions for other information that could be included on this page, please contact Richard Vierra by email at richard@opcertschool.com. Or, you may call the school toll-free at (866) 795-5798.

NOTE: Clicking on the links for any of the following downloads will open a new window. When done, close that window to return to this page.

You will need Adobe Reader to view most of the documents linked on this page. To download a free copy of this program click here:



United States Environmantal Protection Agency Office of Water website:
US EPA Safe Drinking Water Act Regulations and Guidance webpage:
US EPA Drinking Water Standards Quick Reference Guides webpage:



Department of Drinking Water & Environmental Management (DDWEM) website:
To get a copy of California Drinking Water Statutes, 293 pp, Jan 2012:
(Please note the disclaimer at the top of each page) 
To get a copy of California Drinking Water Regulations, 339 pp, Jul 2013:
(Please note the disclaimer at the top of each page) 
26-page section of CA Title 22 that details the operator certification process:
DDWEM Treatment & Distribution Operator Certification Unit homepage:



California Water Operator certification is a three-part process. First, apply to take an exam. Second, after passing the exam, apply for a license. Third, after receiving the license, it must be renewed every three years. For a packet prepared by the Operator Certification Division of DDWEM that shows the process in detail:

Treatment Package, 24 pp, 2008
Distribution Package, 31 pp, 2013


Specific documents also available from the Operator Certification Division of DDWEM:

Water Treatment Operators
  ~ License Renewal form
  ~ Treatment Exam Schedule
  ~ Exam Application form
  ~ Exam Minimum Qualifications
  ~ Exam Expected Range of Knowledge
  ~ Exam Recommended Reading List
  ~ Exam Math Conversions & Formulas, Side One
  ~ Exam Math Conversions & Formulas, Side Two

Water Distribution Operators
  ~ License Renewal form
  ~ Distribution Exam Schedule
  ~ Exam Application form
  ~ Exam Minimum Qualifications
  ~ Exam Expected Range of Knowledge
  ~ Exam Recommended Reading List
  ~ Exam Math Conversions & Formulas


Click here for information regarding certification in California for those who currently hold a water operator license issued by another State. 

If you hold a California water treatment or distribution operator license and would like information about transferring it to another State, call (916) 449-5611 or (916) 449-5610.


Water Math Reference Materials

Dilution Rectangle Calculations - Used to determine the volume/amount of two different solutions (2 unknowns) that must be combined to produce a certain finished concentration and volume when both initial concentrations are given.

TON Calculations - A brief description of the Threshold Odor Number process used for testing drinking water supplies, with examples of TON & geometric mean computations.

SCADA Signals - How to interpret signals generated by the 4-20mA system standard, with math examples for changing a mA signal into the measurement it represents, and changing a certain measurement into the mA signal that should be generated.