Last updated 2026-08-17
TL;DR
Arizona does require a backflow tester certification. You complete an ASSE-approved training course, pass a written and hands-on exam, and register with each local water purveyor where you plan to work. Costs run roughly $300 to $800 for training and testing. The full process takes four to eight weeks, mostly depending on class availability.
Do you need a license to test backflow preventers in Arizona?
Yes. Arizona requires backflow testers to be certified before they can legally test and report on backflow prevention assemblies connected to a public water supply. The authority comes from Arizona Administrative Code Title 18, Chapter 4, which governs water quality at the state level and delegates local enforcement to water providers [1]. Most water purveyors in the state, including the City of Phoenix, Tucson Water, and Mesa Utilities, keep their own approved-tester lists and will not accept test reports from anyone who lacks a current certification recognized in their jurisdiction.
That last point trips people up. Arizona does not issue one single statewide backflow tester license the way some states do. What exists is a combination of state-level ADEQ oversight and local water purveyor programs that each define which certifications they accept. The practical standard across nearly all Arizona jurisdictions is ASSE Series 5000 certification, specifically the ASSE 5110 (tester of backflow prevention assemblies) credential [2]. A handful of larger systems also accept AWWA certification, but ASSE 5110 is what you need if you want to work across multiple water districts without constantly checking individual rules.
Skipping certification and submitting a test report anyway is not a gray area. Water purveyors reject non-certified reports, and the property owner catches a compliance violation. Get the credential first.
What are the step-by-step requirements to become a certified backflow tester in Arizona?
The path has four concrete steps. None of them are optional.
Step 1: Meet the prerequisites. Most ASSE 5110 training providers want you to have some baseline plumbing or mechanical knowledge before you sit in the course. There is no state-mandated prerequisite tied to a plumbing license in Arizona specifically, but individual training programs set their own admission standards. Some require a journeyman plumber card or documented field experience. Confirm with your chosen training provider before you register.
Step 2: Complete an ASSE-approved training course. You need a course built around the ASSE Series 5000 Professional Qualifications Standard for Backflow Prevention Assembly Testers [2]. These courses cover hydraulics, assembly types (RPZ, DC, PVB, SVB), testing procedures, and gauge calibration. In Arizona, courses come from providers including trade association programs and several community colleges. Course length is typically two to three days of classroom and hands-on lab work.
Step 3: Pass the ASSE 5110 written and practical exam. The exam has a written portion and a hands-on component where you demonstrate correct testing procedures on actual assemblies. Both portions must be passed. ASSE administers the exam through approved test administrators, and your training provider often schedules the exam immediately after the course [2].
Step 4: Register with your local water purveyor. After you have your ASSE credential in hand, contact the water utility or utilities in your service area and get on their approved-tester list. Some purveyors require a separate application and a copy of your ASSE certificate. A few charge a small registration fee. This step is local, not state-level, so the paperwork varies by system. Confirm with the relevant board or utility before submitting anything [1].
You will also need a calibrated test kit. Gauge calibration has to be current, typically annual, and many purveyors require proof of calibration with each report submission.
How much does getting a backflow tester certification cost in Arizona?
Expect to spend somewhere between $300 and $800 to get credentialed, depending on who you train with and what equipment you already own. Here is where that range comes from.
Training courses in Arizona run from roughly $250 to $500 for the classroom and lab portion [3]. That range reflects the difference between a bare-bones two-day course and one that includes practice equipment, printed materials, and exam prep. Some providers bundle the exam fee into the course price. Others charge it separately.
The ASSE 5110 exam fee, when charged separately, is in the range of $75 to $150, though this varies by test administrator and can change. Confirm the current fee directly with your training provider or ASSE [2].
Gauge calibration is an ongoing cost more than a first-year cost. Annual calibration at a certified lab runs $50 to $150 per gauge, depending on the lab and how many gauges you send. A standard backflow test kit has two or three gauges.
The test kit itself is your biggest potential expense if you don't already have one. A new ASSE-approved differential pressure backflow test kit costs $300 to $700 depending on brand and configuration. Used kits are available, but verify calibration before buying one.
Local water purveyor registration fees, where they exist, are usually under $50 per jurisdiction, though some larger systems charge more. Confirm current fees with each purveyor.
The table below lays out typical first-year costs.
| Item | Typical Range (Arizona) |
|---|---|
| ASSE 5110 training course | $250 to $500 |
| ASSE 5110 exam fee | $75 to $150 |
| Test kit (new) | $300 to $700 |
| Gauge calibration (annual) | $50 to $150 per gauge |
| Purveyor registration (per utility) | $0 to $50 |
| Estimated first-year total | $675 to $1,550 |
Those numbers do not include your time or travel. If you already have a test kit from prior work in another state, your out-of-pocket drops a lot.
How long does the backflow tester certification process take in Arizona?
Four to eight weeks is a realistic window for most people. The variance comes almost entirely from course availability, not from bureaucratic processing time.
The ASSE 5110 course itself is two to three days. The exam is often held at the end of the course or within a few days of it. If you pass, ASSE issues your certificate fairly quickly, often within two to four weeks of the exam date [2]. Some administrators hand you a temporary certificate right after the exam while the official card processes.
The purveyor registration step at the end can add a few days to a few weeks depending on how busy the utility's cross-connection control department is. Phoenix Water Services and Tucson Water both run online processes that move faster than paper-only systems.
The real bottleneck is finding an open course seat. In a large metro like Phoenix, courses run more frequently, sometimes monthly. In rural Arizona, you may need to drive to a course in a different city or wait for the next session. Check with local trade associations or your community college for current schedules [3].
If you need to have your gauge calibrated before you can start working, factor in the lab turnaround time. Most calibration labs return equipment within five to ten business days.
Which agency or board oversees backflow tester certification in Arizona?
The Arizona Department of Environmental Quality (ADEQ) is the state agency that sets the regulatory framework for backflow prevention under the state's drinking water rules [9]. ADEQ does not issue individual tester credentials directly. What ADEQ does is establish the cross-connection control requirements that water suppliers must follow, and those requirements flow down to the purveyor level.
Arizona Administrative Code Title 18, Chapter 4, Article 2 specifically addresses cross-connection control and requires water systems to maintain programs that ensure only certified testers submit assembly test reports [1]. The practical day-to-day enforcement happens at the water utility, not at ADEQ.
So your regulatory contacts are twofold: ADEQ if you have questions about the state rule itself, and your local water purveyor's cross-connection control coordinator for anything related to getting on their approved-tester list and submitting reports.
ASSE International is the body that owns the 5110 credential standard and approves training providers and test administrators [2]. ASSE is a private standards organization, not a government body, but its credentials are what Arizona's water utilities have chosen to recognize.
For questions about plumbing contractor licensing (a separate requirement if you are running a business that does installations, more than testing), the Arizona Registrar of Contractors is the relevant board [4].
Do you need a plumbing license to be a backflow tester in Arizona?
Not necessarily, but it depends on exactly what services you plan to offer.
Testing a backflow prevention assembly and submitting a report to the water purveyor is a distinct activity from repairing or replacing that assembly. In Arizona, the Registrar of Contractors requires a contractor's license for work that involves installing or repairing plumbing systems [4]. If all you do is test and report, many jurisdictions treat that as a certification-only activity that does not require a contractor license. If you repair a failed assembly as part of the same site visit, you are in repair territory, and the contractor license question becomes real.
Many backflow testers in Arizona are licensed plumbers or work for plumbing contractors. That combination makes it easier to offer the full service: test, identify failures, repair or replace, retest, and submit the final report. If you want to offer only testing and nothing else, confirm with the Arizona Registrar of Contractors and your target water purveyor what activities fall within your allowed scope [4].
Some water purveyors add their own language to approved-tester requirements and may require that testers be employed by or affiliated with a licensed contractor. Check locally.
What is the ASSE 5110 exam and what does it cover?
The ASSE 5110 exam is the Professional Qualifications Standard for Testers of Backflow Prevention Assemblies, published by ASSE International [2]. It is the credential most Arizona water utilities recognize for approved backflow testers.
The exam covers four main areas. First, hydraulics and cross-connection control concepts, including how backpressure and backsiphonage occur and why different assembly types address different hazard levels. Second, assembly identification and function, meaning you need to know how a reduced pressure zone assembly (RPZ), a double check valve assembly (DC), a pressure vacuum breaker (PVB), and a spill-resistant vacuum breaker (SVB) each work mechanically. Third, test procedures for each assembly type, using a differential pressure gauge kit, following the manufacturer's test sequences. Fourth, gauge operation and calibration requirements, including how to verify your gauge is within tolerance before a test.
The hands-on (practical) portion of the exam requires you to actually set up and run the test procedures correctly on physical assemblies. You cannot pass by memorizing procedures alone. You have to do them.
ASSE updates its standards periodically. The current version governing the 5110 credential is what your training provider and exam are built around. If you are using a study kit or practice materials, confirm they match the current edition.
What test equipment does a backflow tester need in Arizona?
You need a calibrated differential pressure gauge test kit designed for backflow assembly testing. The kit connects to the test cocks on the assembly and lets you read the differential pressure across the check valves and the relief valve on an RPZ.
Common kit brands include Watts, Fieldpiece, and Mid-West Instrument. Your kit must be calibrated annually by a certified calibration lab, and that calibration must be documented. Many Arizona water purveyors require you to include proof of current gauge calibration when you submit test reports or when you register as an approved tester.
Beyond the gauge kit, you need basic hand tools for opening test cocks (typically a screwdriver and a specialty wrench for some assembly brands), a bleed hose, and a way to manage the water that drains during testing. Some testers carry a small bucket. Others use a drain hose depending on the site.
For the ASSE 5110 exam's practical component, the training facility usually provides assemblies and a test kit for use during the exam. You do not need to bring your own kit to the exam, though practicing on your own kit before exam day helps.
If you are weighing whether to buy a new kit or start with a used one, a used kit can save $200 to $400, but have it calibrated before you use it professionally. A kit that is out of calibration produces results that are not defensible to a water purveyor.
How do you find ASSE 5110 training courses in Arizona?
ASSE International maintains a list of approved training providers on its website [2]. That is the most reliable starting point because it reflects providers that have gone through ASSE's approval process, more than anyone who advertises a backflow course.
In Arizona, training is also available through trade association programs and local chapters that sometimes coordinate or host ASSE 5110 courses [3]. Local community colleges with plumbing technology programs occasionally offer the training as well, though scheduling varies.
For study materials before your course, ASSEPath offers a $149 one-time information kit built around the ASSE 5110/5115 standards at /start. It covers the paperwork path and exam prep concepts. The course itself, run by an ASSE-approved provider, is still required for credential issuance regardless of what study materials you use.
When evaluating courses, ask these specific questions: Is this course approved by ASSE International? Is the exam administered at the end, or do I schedule it separately? Does the course fee include exam fees? Are physical assemblies available for hands-on practice? The answers vary by provider and matter for your budget and timeline planning.
For comparison with how neighboring states handle this, see the guide on how to start backflow tester in California and how to start backflow tester in Colorado, both of which use similar ASSE-based frameworks with some local differences.
How do you register with Arizona water purveyors after getting certified?
Once you have your ASSE 5110 certificate, contact the cross-connection control coordinator at each water system where you plan to work. Arizona has over 1,300 community water systems regulated by ADEQ [9], and most of the larger ones keep their own approved-tester lists.
The typical registration process involves submitting a copy of your ASSE certificate, proof of current gauge calibration, and sometimes a completed application form. Some purveyors also want proof of liability insurance, particularly if you will be working on commercial or industrial accounts. There is no single statewide registration portal. Each utility handles this independently.
Phoenix Water Services, Tucson Water, Mesa Utilities, and Chandler's water division are the largest systems by connection count in the state. If you are based in the Phoenix metro area, getting on the City of Phoenix and Mesa lists alone covers a large portion of potential work. Smaller systems often accept testers registered with a neighboring large system, but do not assume this. Ask.
Renewal matters too. ASSE 5110 certification must be renewed every three years through continuing education and renewal fees [2]. Local purveyor registrations typically follow a calendar year and require proof of current ASSE certification at renewal. Let either one lapse and your reports will be rejected until you are current again.
What does a backflow tester earn in Arizona?
Backflow testing rates in Arizona vary by metro area, service type (residential versus commercial), and whether you are an employee or running your own operation.
For independent testers, residential test reports typically run $50 to $100 per assembly. Commercial assemblies, which take more time and sometimes access coordination, often run $75 to $150 or more per assembly. High-hazard industrial accounts command higher rates.
The Bureau of Labor Statistics groups backflow testers within the broader category of plumbers, pipefitters, and steamfitters. In Arizona, that group earned a median hourly wage of approximately $31.11 as of May 2023, with the top 10 percent earning over $47 per hour [5]. Testers who run independent operations with multiple accounts can exceed those figures, but that involves business overhead the employment wage figure does not capture.
A backflow tester doing 10 residential tests per day at $65 each is grossing $650 per day before expenses. That math gets appealing quickly, which is why many licensed plumbers add the certification to expand their service rather than build a standalone backflow business. Neither path is wrong. It depends on what kind of work week you want.
For a broader look at the licensing framework and what affects earning potential, see the full backflow tester license in Arizona guide.
How does Arizona compare to neighboring states for backflow tester requirements?
Arizona sits in the middle of the western states on regulatory complexity. It is not as standardized as California, which runs a more formal statewide cross-connection certification program, and it is not as locally fragmented as some smaller states where each water district essentially writes its own rules with minimal state oversight.
The table below compares key requirements across Arizona and three neighboring states. Numbers should be confirmed with each state's relevant agency, as they change.
| State | Primary credential | Statewide registry | Purveyor registration also required |
|---|---|---|---|
| Arizona | ASSE 5110 (standard) | No single statewide list | Yes, per utility |
| California | ASSE 5110 or USC FCCCHR | No single statewide list | Yes, per utility [6] |
| Colorado | ASSE 5110 | No single statewide list | Yes, per utility |
| Nevada | ASSE 5110 | No single statewide list | Yes, per utility |
The pattern across the Southwest is consistent: ASSE 5110 is the de facto standard, there is no centralized state registry that transfers directly to purveyor approval, and you have to do the local registration step regardless of how clean your ASSE credential is.
For specifics on how Alaska structures its program differently, the backflow tester license in Alaska guide shows a contrasting approach.
If you are weighing Arizona against another state for where to base your operation, Arizona's large and growing metro population (the Phoenix metro added roughly 370,000 residents between 2010 and 2020 [7]) means there is genuine demand. Irrigation, commercial development, and aging infrastructure together create consistent annual testing volume.
Frequently asked questions
Do you need a license for backflow tester in Arizona?
Yes. Arizona water purveyors require backflow testers to hold an ASSE 5110 certification before they can submit legally valid test reports. The state framework under Arizona Administrative Code Title 18, Chapter 4 requires water systems to use certified testers, and local utilities enforce this by keeping approved-tester lists. Without the credential, your test reports will be rejected.
How much does backflow tester certification cost in Arizona?
Plan on $300 to $800 for training and exam fees alone. Add $300 to $700 for a new test kit if you do not already own one, plus $50 to $150 per gauge for annual calibration. First-year total costs typically run $675 to $1,550. Course fees range from $250 to $500. Exam fees, when charged separately, are roughly $75 to $150. Confirm current fees with your training provider.
How long does getting a backflow tester certification take in Arizona?
Four to eight weeks is typical from start to finish. The ASSE 5110 course is two to three days, the exam follows shortly after, and ASSE issues the certificate within roughly two to four weeks of a passing exam. Purveyor registration adds a few days to a few weeks. The main variable is how quickly you can find an open course seat.
Which agency regulates backflow testers in Arizona?
The Arizona Department of Environmental Quality (ADEQ) sets the state regulatory framework under Arizona Administrative Code Title 18, Chapter 4. ADEQ does not issue individual tester credentials. Day-to-day enforcement happens at the water purveyor level, meaning each local utility keeps its own approved-tester list. ASSE International owns the 5110 credential standard that most Arizona utilities recognize.
Is ASSE 5110 required in Arizona or are there other accepted certifications?
ASSE 5110 is the standard credential accepted across virtually all Arizona water utilities. Some larger systems also accept AWWA certification. There is no single statewide mandate naming one credential exclusively, so individual purveyors set their own acceptance policies. ASSE 5110 is the safest choice if you want to work across multiple water districts without checking each one's rules separately.
Do you need a plumbing license to test backflow preventers in Arizona?
Not necessarily for testing alone, but it depends on your service scope. Testing and reporting does not automatically require an Arizona contractor license. Repairing or replacing a failed assembly does. Many water purveyors prefer or require testers to be affiliated with a licensed contractor, particularly for commercial work. Confirm your scope with the Arizona Registrar of Contractors before you start offering repair services.
How do I get on a water purveyor's approved backflow tester list in Arizona?
Contact the cross-connection control coordinator at each utility where you want to work. Submit your ASSE 5110 certificate, proof of current gauge calibration, and any application form the utility requires. Some purveyors also ask for proof of liability insurance. There is no centralized statewide registration. You register separately with each water system, and the process varies by utility.
How often does an ASSE 5110 certification need to be renewed?
ASSE 5110 certification requires renewal every three years. Renewal involves completing continuing education hours and paying a renewal fee to ASSE International. Local water purveyor registrations typically renew annually and require proof of current ASSE certification. If your ASSE credential lapses, local registrations become invalid and purveyors will reject your test reports until you reinstate the credential.
What test equipment do I need to start as a backflow tester in Arizona?
You need a calibrated differential pressure gauge test kit designed for backflow assembly testing. The kit must be calibrated annually by a certified lab, with documentation. Common brands include Watts and Mid-West Instrument. Beyond the gauge kit, you need basic hand tools, a bleed hose, and a way to manage drainage during testing. Purveyors typically require proof of current calibration when you submit reports.
Can I transfer my backflow tester certification from another state to Arizona?
ASSE 5110 is a national credential, not a state-issued license, so it does not need to be transferred. If you hold a current ASSE 5110 certification from work in another state, you can use it in Arizona. You still need to register with each Arizona water purveyor where you plan to work and provide proof of the current ASSE credential and gauge calibration.
Where can I find ASSE 5110 training courses in Arizona?
ASSE International's website lists approved training providers. In Arizona, courses are also available through trade association programs and some community colleges with plumbing technology programs. Course availability in the Phoenix and Tucson metros is more frequent than in rural areas. Confirm that any course you register for is ASSE-approved and includes both classroom and hands-on lab components before paying.
How much can a backflow tester earn in Arizona?
Independent testers typically charge $50 to $150 per assembly depending on assembly type and account size. The Bureau of Labor Statistics reported a median hourly wage of about $31.11 for Arizona plumbers and pipefitters as of May 2023, which includes many backflow testers. Independent operators running multiple daily tests can exceed employment wages, though business overhead affects net income significantly.
Do small water systems in rural Arizona require the same backflow tester certification?
Generally yes. ADEQ's cross-connection control rules apply to all community water systems in Arizona, not only large urban utilities. However, enforcement capacity and approved-tester list formality vary a lot between a 500-connection rural system and a major metro utility. Contact the specific small system's water operator directly to confirm what credentials and registration they require before starting work.
Is backflow testing in Arizona a good business to start?
The Phoenix metro's continued growth and large commercial and multifamily inventory create steady testing demand. Certification costs are manageable, recurring annual testing requirements generate repeat business, and the credential is portable across most of the country. The main limit on income is how many accounts you can service per day. Nobody has clean market-size data for Arizona specifically, but demand in fast-growing metros tends to track construction and population growth.
Sources
- Arizona Secretary of State, Arizona Administrative Code Title 18 Chapter 4 Article 2: Arizona Administrative Code Title 18, Chapter 4 governs water quality and cross-connection control, requiring water systems to use certified backflow testers
- ASSE International: ASSE 5110 is the Professional Qualifications Standard for Testers of Backflow Prevention Assemblies, with three-year renewal and approved training provider requirements
- Arizona Registrar of Contractors: Arizona plumbing trade programs and training providers coordinate backflow training and continuing education for plumbing professionals in Arizona
- Arizona Registrar of Contractors, License Requirements: The Arizona Registrar of Contractors requires a contractor license for plumbing installation and repair work in Arizona
- U.S. Bureau of Labor Statistics, Occupational Employment and Wages, May 2023, Arizona, Plumbers, Pipefitters, and Steamfitters (47-2152): Arizona plumbers, pipefitters, and steamfitters earned a median hourly wage of approximately $31.11 as of May 2023, with the top 10 percent earning over $47 per hour
- USC Foundation for Cross-Connection Control and Hydraulic Research, Certification Programs: California accepts both ASSE 5110 and USC FCCCHR certification for backflow assembly testers
- U.S. Census Bureau, Phoenix city Arizona QuickFacts: The Phoenix metro area added roughly 370,000 residents between 2010 and 2020, reflecting significant growth that drives backflow testing demand
- Arizona Department of Environmental Quality, Drinking Water Program: ADEQ administers Arizona's drinking water program, including oversight of the cross-connection control requirements that govern backflow tester certification in the state