Backflow Prevention

PID takes great care to ensure the water delivered to your home is clean and healthful. To keep our water safe, PID may require customers use backflow prevention methods at their point of service.  

Backflow is a reverse flow of water (or other substances) from an uncontrolled source back into the public water distribution system. A backflow prevention assembly is designed to prevent water from flowing backward into the public water system.

Important: If you are requesting water be turned on at your property after the Camp Fire, you must request PID install an Interim-Water Backflow Device. The fee for the device is dependent on the device size and may be reimbursable by your insurance.  


  • 1" Device: $546.76

  • 1 1/2" Device: $871.11

  • 2" Device: $957.28

Call PID at 530-877-4971 to discuss water service and installation of the device.


Who needs a backflow prevention assembly?

PID customers who have a known or potential water-quality hazard on their property. Examples of hazards include:

  • Damage from Camp Fire
  • Residential or commercial fire suppression systems.
  • Pressurized or pumped (S.T.E.P) septic systems.
  • Auxiliary or other water sources such as wells, tanks, ponds and creeks.
  • Multiple water meters.
  • Certain types of irrigation and other plumbing systems.
  • Occupancy or use related hazards.

What types of backflow assemblies can be used?

Permission to use a double check (DC) assembly may be granted at PID's discretion.

Installation requirements:

Water service will not be activated until the backflow assembly passes inspection and functionality testing. We can help make this process easier. Contact PID prior to purchasing and installing a backflow prevention assembly. We will meet with you on site to determine the installation location and answer any questions you may have.

Maintenance requirements:

  • The assembly must be tested at least once annually. PID will mail a reminder.
  • Test must be performed by a CA/NEV AWWA certified backflow prevention assembly tester.
  • Repairs can be performed by anyone including the property owner, licensed plumbers or certified backflow testers.
  • PID provides testing services but does not perform installation or repair.

I received a test notice from PID - what do I do next?

  • You must ensure your assembly passes annual inspection BEFORE the deadline on the notice. Start the process early allowing time for any repairs or replacement that may occur due to a failed test.
    • Have PID perform your test - Simply detach and sign the indicated portion of the notification letter and return it to PID, enclosing payment for each assembly to be tested. 
      • PID will perform the test once payment is received.
      • We will notify you only if the assembly fails.
      • You are responsible for any repairs, re-testing or plumbing issues that may result from the testing procedures.
    • Or, hire an AWWA  certified backflow tester to perform the test - submit these results to PID before the deadline on the notice. 

What to do if your assembly fails inspection:

  • Hire a professional to repair or replace the assembly according to PID instructions.PID will not perform the maintenance work.
  • Don't Wait - You must replace or repair your assembly by the due date; failure to do so could result in an interruption to your water service.
  • If your existing assembly fails a functionality test and does not meet current installation requirements, PID may require you to replace the assembly with a model that meets current requirements. PID may also require you to move the assembly to an acceptable location.
  • Pay to have your assembly retested

Installation Inspection & test fees

Installation and test resources:


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