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Annual testing

City of Patterson Backflow Prevention Device Annual Test Program annual backflow testing

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

Utility: City of Patterson Backflow Prevention Device Annual Test Program Last verified: 2026-04-05 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.
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Direct answer

What matters here

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.

Highlights

Highlights

  • 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

Workflow

  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.
Residential

Residential

  • Patterson's public page is phrased around property owners and responsible parties rather than only large commercial accounts.
  • The annual notice system means even smaller protected properties can receive explicit testing instructions from the city.
Commercial focus

Commercial and managed properties

  • Commercial intent is strong because the city maintains an approved outside tester table instead of a generic advisory page.
  • The city can also test devices when an owner does not respond, which adds urgency to the annual cycle.
FAQ

Local questions people actually ask

Does City of Patterson Backflow Prevention Device Annual Test Program require annual backflow testing?

Annual. 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 by City of Patterson Backflow Prevention Device Annual Test Program backflow rules?

Property owners and responsible parties whose backflow prevention devices are installed on the City of Patterson water infrastructure.

How do I submit or confirm a backflow test for City of Patterson Backflow Prevention Device Annual Test Program?

Use the official utility workflow and submission methods listed on this page: Patterson annual test program. Program phone: 209-895-8063.

Where should I look for testers for City of Patterson Backflow Prevention Device Annual Test Program?

Start with the governing authority's published tester list. This utility has an official approved-tester route and it should be treated as the primary source.