Backflow Tester List

State rules

Michigan

The Michigan Department of Environment, Great Lakes, and Energy oversees community-water-supply cross-connection programs under the state Safe Drinking Water Act rules. EGLE’s page says a cross-connection is an unprotected plumbing arrangement through which backflow can occur, and that each community supply must implement a program of inspections, testing, recordkeeping, and education. For a public water supply official to accept test results, EGLE’s August 30, 2023, credential FAQ says the tester must be a master plumber, a journey plumber, or an apprentice plumber working under the direct supervision of a journey or master plumber, and must hold a valid ASSE 5110 certification. ASSE 5110 alone does not allow testing in Michigan.

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
EGLE oversees public-water-supply cross-connection programs, and LARA’s Bureau of Construction Codes addresses the plumber-license side of testing.
Who may test an assembly
The tester must be a master plumber, journey plumber, or supervised apprentice plumber and must hold a valid ASSE 5110 certification.
Official program page
Official page →

The FAQ says the questions relate to a joint interpretive statement by the Department of Licensing and Regulatory Affairs, Bureau of Construction Codes, and EGLE, sent July 13, 2023. EGLE cites Rule 1405 of the Safe Drinking Water Act administrative rules for the requirement that public water supply officials ensure testers have proper credentials before accepting results. The FAQ also says anyone who qualifies may keep an ASSE 5110 certification if continuing education is met and the certification is not revoked, because Michigan has no authority to issue or revoke certifications issued by ASSE. The state limit is on whose results a public water supply may accept.

EGLE’s noncommunity testing sheet repeats the same joint statement: testing must be performed by a person with an active ASSE 5110 certification who is a master plumber, a journey plumber, or an apprentice under the direct supervision of a journey or master plumber. It says testable assemblies are tested upon installation, after repair or relocation, or at the frequency in an approved program. The community page says customers with a testable preventer may get a letter asking for a test by a professional with ASSE 5110 certification, and that the customer often pays the installation and testing cost. That cost statement is not a fee schedule.

To verify the plumber license, the FAQ says to use the skilled-trades lookup and choose plumbers. To verify ASSE 5110, it points to the ASSE International search. Those are the two checks a customer should make. A neighboring state’s tester card, without the Michigan plumber status the FAQ requires, is not what the FAQ says a public water supply official may accept. The environmental assistance telephone printed in the joint-statement materials reviewed with the FAQ is 800-662-9278.

Official resources in Michigan

EGLE cross connection control

Describes the community-water-supply program and points to the revised tester-credential FAQ.

Backflow tester credentials FAQ

Says acceptable testers need both the plumber status described and a valid ASSE 5110 certification.

LARA and EGLE joint interpretive statement

States the plumbing-license and ASSE 5110 positions of the two departments.

Key facts for Michigan

What to do next

  1. Ask for both the Michigan plumber license and the current ASSE 5110 card.
  2. If an apprentice will be on site, ask which journey or master plumber is directly supervising.
  3. Do not accept a tester who offers only an out-of-state card.
  4. Keep the utility’s letter; that is the document that tells you a test is due.

Looking for your city or county in Michigan?

We haven't found official program-level pages for Michigan 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 Michigan, 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.
    EGLE community water supply cross connection control
    Website →
    Phone: (800) 662-9278 (as listed on that page, checked Oct 4, 2026)
    Your city or county office: Local governments →
    Not sure who handles it locally? USAGov's free help line, 1-844-872-4681, or the Michigan 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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