Backflow Tester Certification: How to Get Certified to Test Backflow Preventers

Backflow tester certification is a person-level credential showing that a technician can field-test backflow prevention assemblies — reduced pressure (RP), double check (DC), pressure vacuum breaker (PVB) and spill-resistant vacuum breaker (SVB) — using a published field test procedure.

It is not a national credential.

The programs that issue tester certifications — ASSE, ABPA, AWWA sections and state programs — are recognized, or not, by state health and environment agencies, plumbing boards and local water purveyors, and each area sets its own acceptance.

For fire protection workers the credential has a specific pull: ASSE counts fire protection among the experience fields that qualify for its 5110 tester certification, and ASSE's 5000 series includes a dedicated fire sprinkler cross-connection tester certification alongside it.

New to the role itself?

The backflow tester career guide covers the job — the fire line, the test day and who hires — before you pick a credential.

Two different questions sit under "who issues it": which body issues a credential, and which body accepts it where you work.

Issuing is the program's job; acceptance is decided where you work.

• ASSE issues the 5110 Backflow Prevention Assembly Tester certification, with training delivered by ASSE-approved schools. Its 5000 series also lists a 5120 Cross-Connection Control Surveyor, 5130 Backflow Prevention Assembly Repairer, 5140 Fire Sprinkler Cross-Connection Control Tester and 5150 program administrator.
• The American Backflow Prevention Association (ABPA) runs a voluntary Backflow Prevention Assembly Tester certification built on a closed-book written exam and a performance exam.
• AWWA sections. The tester program we verified is the California-Nevada Section's own Backflow Prevention Assembly Tester exam, with an application deadline and member and non-member fees; we did not verify what other AWWA sections run.
• The USC Foundation for Cross-Connection Control and Hydraulic Research runs a week-long tester training course that ends in a certificate of completion — a course certificate, not an ongoing certification.

Whichever program you choose, acceptance is decided locally, by the state agency, plumbing board or water purveyor that enforces cross-connection control in your work area.

The table below shows what each program's page said about entry requirements, exams and fees when we read it in October 2026.

ASSE training runs through its approved schools: you enroll with the school, then sit ASSE's written exam and practical.

The coursework is procedure-heavy.

ASSE says its 5110 testers are trained to multiple field test procedures — the USC 10th Edition, ASSE, EPA, Illinois, Missouri and one-hose procedures — and ABPA builds its tester exam on the USC Foundation's 10th edition field test procedures.

One rule holds across ASSE, ABPA and the USC Foundation course: each ends in a hands-on practical or performance exam on physical assemblies, so none of those three issues a tester credential on coursework alone — plan on in-person exam time.

The California-Nevada section page we read lists its exam, fees and application deadline but does not spell out the exam format, so ask the section what its exam involves before you book.

Our research did not establish which states make a plumbing license a prerequisite for backflow tester certification — that question was not compiled at national level; it is set jurisdiction by jurisdiction.

What the acceptance structure does mean: the state health or environment agency, plumbing board or water purveyor over your area decides which programs it accepts and who must certify, so the licensing question travels with the certification question.

The credential's own eligibility is broader than plumbing.

ASSE 5110 counts documented experience from plumbing, mechanical, fire protection, lawn irrigation or a related field toward its five-year requirement, and ABPA's published entry route is a training course or two years' experience in a recognized program.

Keep the two things separate in your head: a tester certification is an industry credential, while a plumbing or fire protection license is a permission issued by a government regulator.

Ask the water authority that will accept your tests and your state licensing agency how the two stack where you work.

In fire protection, the assemblies that matter sit on the fire line — the supply piping that connects a building's sprinkler system to the public water main.

Who may test them is decided the same way as for any other assembly: locally, by the water purveyor and state agencies over the area.

ASSE maintains a certification aimed at exactly this work: 5140 Fire Sprinkler Cross-Connection Control Tester, listed in its 5000 series alongside the 5110 tester, 5130 repairer, 5120 surveyor and 5150 program administrator.

The page we read did not set out 5140's eligibility or exam details, so confirm those with ASSE before you plan around it.

Our research did not compile which states require a fire protection (sprinkler) license in addition to a tester certification for fire-line test work.

Put that question to your state fire marshal or licensing agency and to the water purveyor before you take fire-line test work.

The entry path does run through fire protection: ASSE 5110 counts fire protection among the fields whose documented experience satisfies its five-year requirement, so time in this trade is one of the named entry routes into the credential.

For the contractors hiring, test work on fire lines rides on the credential the local authority accepts: where the authority requires certified testers, sprinkler contractors and inspection firms taking that work need testers holding an accepted certification.

ASSE 5110 certification lasts three years.

Renewal takes a minimum 8-hour class, a written exam — 50 questions now, growing to 100 questions from January 1, 2027 — and a hands-on practical exam, and holders may recertify up to six months early without losing time.

ASSE states the same cycle across its certifications: renewal every three years, up to six months early.

ABPA certification also runs three years, and recertification means passing the written and performance exams again.

The 30-day pairing — both exams completed within 30 days of each other, with a passed part kept for one year if the other is failed — is a rule ABPA states for the initial certification.

The USC Foundation's course ends in a certificate of completion rather than an ongoing certification, so there is nothing to renew until you hold a certifying body's credential.

Gauge calibration is the gap: the program pages we read — ASSE's, ABPA's, the USC Foundation's and the California-Nevada AWWA section's — did not publish calibration requirements for tester equipment.

Ask your certifying program and the water authority that accepts your tests what they require before you buy or book anything.

There is no national answer to "what does my state require."

Who must certify testers and which programs are accepted is set by state health and environment agencies, plumbing boards and local water purveyors, and the requirements differ from one area to the next.

ABPA puts the check directly on the candidate: check with your local water or health departments to determine whether its tester certification is recognized in your area.

That advice generalizes to every program on this page.

California shows how specific the rules get.

ASSE reports that the state's State Water Resources Control Board recognized ASSE 5110 under its Cross-Connection Control Policy Handbook in a letter ASSE dates June 17, 2025, with that acceptance running until July 1, 2027.

From July 1, 2027, ASSE reports, only certifying organizations accredited by ANAB/ANSI to comply with ISO/IEC 17024 will count, and ASSE says its own accreditation is "in process."

If you test in California, confirm the current status with the State Water Resources Control Board before you schedule an exam.

Career information, not licensing, legal, code, inspection, engineering or safety advice — confirm backflow tester certification requirements with the state agency, plumbing board or water purveyor over your area before you enroll.