Backflow Tester List

State rules

Minnesota

The Minnesota Department of Health explains high-hazard cross-connections and points to the plumbing code for who tests assemblies. MDH says it defines high-hazard cross-connections as those that would require a reduced-pressure zone backflow preventer or an air gap. The plumbing rule it quotes, Minnesota Rules part 4714.0603.2, says devices or assemblies installed for backflow protection shall be tested at installation, repair, or relocation and not less than annually, or more often if the authority having jurisdiction requires it. Testing shall be performed by a certified backflow assembly tester in accordance with ASSE Series 5000. MDH does not, on these pages, issue the tester certificate itself.

Checked against official sources on October 11, 2026. Rules and links change; confirm with the office listed before you act.

Try a ZIP like 30303, “Travis County” or “Columbus, OH”
Drinking-water agency
The Minnesota Department of Health explains high-hazard cross-connection expectations, and the plumbing code it quotes sets tester and testing duties.
Who may test an assembly
Testing is performed by a certified backflow assembly tester in accordance with ASSE Series 5000, as the quoted Minnesota plumbing rule states.
Official program page
Official page →

The responsible-authorities page quotes the further rule on testable assemblies that meet ASSE standards 1013, 1015, 1020, 1047, 1048, or 1056. The administrative authority must be notified before installation. The public water supplier must be notified within 30 days after installation on a community public water system. A test and inspection tag is affixed to the assembly. The tester dates and signs the tag and includes the tester’s backflow prevention tester certification number. Written records are maintained and submitted to the administrative authority and, if the assembly is on a community system, to the public water supplier within 30 days of testing.

MDH’s high-hazard page says the plumbing code effective January 23, 2016, requires annual testing of testable devices installed on or after that date, including reduced-pressure zone assemblies, pressure vacuum breakers, spill-proof vacuum breakers, and double check valve assemblies. Installation and test notices go to the community public water supplier. MDH says the supplier is not responsible for enforcing that report, but the notice still supports a local program. MDH has described a future rule on trained staff, records, and enforcement, with details left to each system.

Because the quoted rule names ASSE Series 5000 for the tester, that name is used here only as the plumbing code states it. MDH’s pages do not publish a state roster of those testers. A customer should ask the administrative authority and the community water supplier which certification number they will accept on the tag, and should keep the 30-day notice in mind after installation and after a test.

Official resources in Minnesota

MDH responsible authorities

Quotes the plumbing-code testing rule, ASSE Series 5000, and the 30-day record rule.

High-hazard cross connections in Minnesota

Explains MDH’s high-hazard definition and the 2016 plumbing-code annual-test requirement.

Backflow prevention devices fact sheet

Summarizes ASSE device standards and says annual testing is required for several assembly types.

Key facts for Minnesota

What to do next

  1. Ask for the certification number that will appear on the tag.
  2. Ask the community water supplier whether it wants the 30-day installation and test notices.
  3. Do not assume MDH will name the tester; the pages place certification in the plumbing-code rule.
  4. Separate a high-hazard reduced-pressure assembly from a low-hazard double check when you ask what is due.

Looking for your city or county in Minnesota?

We haven't found official program-level pages for Minnesota we can verify yet, so we don't show local numbers here rather than guess. Here's what to use instead, in order:

  1. General Start with the statewide information above. It applies across Minnesota, but cities and counties can add their own steps, fees or deadlines.
  2. Call to confirm Ask the official office. They have the current local rule, fee and form.
    Minnesota Department of Health cross-connection pages
    Website →
    Phone not shown: use the contact page on the official website above.
    Your city or county office: Local governments →
    Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Minnesota page on USA.gov can point you to the right office.
  3. Know the current info? Tell us and include a link to the official page. We check every tip before it goes up.

Helpful guides

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