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Patterson annual backflow testing

Patterson runs an annual program tied to January letters and an approved outside tester workflow.

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City: Patterson Utility: City of Patterson Backflow Prevention Device Annual Test Program Cadence: Annual Last verified: 2026-06-29
Local answer

What to check for Patterson

Patterson runs an annual program tied to January letters and an approved outside tester workflow.

  • Due basis: Patterson mails periodic test and maintenance letters in January and expects property owners to notify the city of their selected approved outside tester. If the owner does not respond, the city may perform the testing itself.
  • Who is affected: Property owners and responsible parties whose backflow prevention devices are installed on the City of Patterson water infrastructure.
  • Program phone: 209-895-8063
Local signals

Signals that matter before you act

  • The city mails periodic test and maintenance letters in January.
  • Owners are expected to notify the city of the approved outside tester they will use.
  • Patterson publishes the approved outside tester table directly on the public page.
Workflow

Patterson workflow order

  1. Watch for the city's annual letter or confirm the device is on the annual program.
  2. Choose one of Patterson's approved outside testers and notify the city.
  3. Complete the annual test so the city does not have to step in under the program.