1.2 Eligibility, 40-Hour Course, Written & Practical Format

1.2 Eligibility, 40-Hour Course, Written & Practical Format

Quick Answer: To sit for ASSE 5110, you need 5 years of documented practical experience in plumbing, mechanical, fire protection, lawn irrigation, or a related field and a minimum 40-hour ASSE-approved course. You must pass a 100-question, 2-hour, closed-book written exam at 70%+ and a no-notes practical that field-tests ASSE 1013, 1015, 1020, and 1056 in a continuous 1½ hours (at least one assembly in fail mode). Official details: ASSE personnel certification pages and CCC Guidelines rev 03/24/2026.

Why the dual gate exists

ASSE does not certify “people who attended class.” It certifies people who can both explain hydraulics, assemblies, codes, and procedures on a written exam and perform field tests under time pressure without notes. Eligibility rules keep candidates from sitting the exams without enough trade background; the 40-hour course ensures every candidate saw the same competency set; the two exams prove knowledge and skill separately.

If you only grind multiple-choice questions and never develop smooth gauge hookups, you can fail the practical even with a strong written score. If you can muscle through assemblies by memory of muscle habits but cannot explain why a relief valve opens, you can fail the written. Plan for both from week one of class.

Eligibility: experience plus approved training

Five years of documented practical experience

ASSE’s published 5110 requirements include a minimum of five (5) years of documented practical experience in the installation or service of:

• Plumbing
• Mechanical systems
• Fire protection
• Lawn irrigation
• Or a related industry field

“Documented” means your school and ASSE expect verifiable work history—not a verbal claim on class day. Related fields are interpreted through the school’s eligibility review against Series 5000 and the CCC Guidelines; if your background is atypical (for example long military utilities service), bring detailed records and ask the ASSE-approved school early, not the morning of the exam.

Minimum 40-hour ASSE-approved course

You must successfully complete a minimum 40-hour training course on backflow assembly testing that covers all aspects of ASSE 5110. Only ASSE-approved schools may deliver that course for certification eligibility. The course is not a casual weekend seminar; it combines classroom theory with wet-lab practice on live or training assemblies using calibrated gauges.

Typical 40-hour course content maps to the competencies you will see throughout this guide:

Schools affirm student eligibility when they file class applications with ASSE. Do not assume that “years in the trade” alone let you skip the course—both experience and the approved 40-hour course are required for initial certification under the standard path.

Written exam format (initial 5110)

Per the Guidelines for ASSE-approved Cross-Connection Control Schools (rev 03/24/2026) and ASSE program materials:

What the written covers

ASSE does not publish a weighted exam blueprint with percentages. The one subject list it does publish appears in the CCC Guidelines under State-Specific Requirements for schools teaching in Arizona, California, Hawaii, Nevada, Texas, and Utah, where the initial written exam shall include at least:

• Hydraulic theory and principles of backflow
• State-specific cross-connection control codes and regulations
• Backflow prevention assemblies — installation, design, operation, and maintenance
• Field test equipment — type and when to verify accuracy
• Recordkeeping and safety
• Field test procedures for RP, DC, PVB, and SVB utilizing USC’s 10th Edition procedures
• All other requirements stated in the CCC Guidelines for written exams

Treat that list as the best public statement of exam scope anywhere in the country — it is what this guide is built around — while remembering two things: those six states mandate USC 10th, and outside them ASSE recognizes several procedure families (ASSE, EPA, NEWWA, One-Hose, TREEO, USC 10th). Anyone quoting you a “15% hydraulics / 30% field test” blueprint is quoting an estimate, not ASSE.

Seventy percent of 100 questions means you need at least 70 correct. That is not a “barely remember the acronyms” bar when questions mix procedure order, pass criteria, and hazard classification. Pace yourself: roughly 1.2 minutes per question if you use the full two hours, with a buffer for harder items.

Practical exam format (initial and recert share the skill gate)

The practical is a pass/fail demonstration witnessed by an ASSE-approved proctor. Key rules from the CCC Guidelines:

ASSE-recognized test procedures

Recognized procedures include, but are not limited to:

• USC 10th Edition (Foundation for Cross-Connection Control and Hydraulic Research)
• ASSE field test procedures
• EPA methods
• NEWWA, One-Hose, TREEO, and other procedures listed in the guidelines

Your school teaches one consistent procedure set for all four assemblies. On exam day, follow the procedure your school documented with ASSE—do not freestyle a hybrid from internet videos.

How pass/fail is judged

The proctor observes whether your actions would correctly determine assembly condition. If you take an action that adversely affects (or could adversely affect) the outcome on a given assembly, the proctor informs you after that assembly’s test that an error occurred—without immediately coaching the fix—and you may get a second attempt on that assembly under the guidelines’ process. A second error (or declining a second attempt) fails the practical. Details of coaching limits matter less than this principle: procedure integrity is graded, not friendliness.

Applicants must successfully field-test all four assembly types. Partial credit for three perfect tests and one botched RP does not exist.

Facilitator vs instructor vs proctor

Role separation is an integrity feature of the program:

If someone tells you “our teacher always grades the written,” that arrangement is not aligned with ASSE facilitator rules. Expect photo ID checks, cleared desks, removed training aids, and a visible clock.

Cost and scheduling realities

Typical bundled course + exam pricing runs about $600–$1,150, varying by provider, region, materials included, and whether lodging or gauge rental is separate. Recertification courses are shorter and usually cheaper, but initial candidates should budget for:

• Tuition for the 40-hour class
• Exam fees embedded or itemized
• Personal gauge purchase or rental (if not provided)
• Travel and time off work
• Possible retest fees if you fail written or practical

Schools submit class applications to ASSE well before exam day (guidelines require substantial lead time—plan weeks ahead, not days). Confirm the exam date, facilitator, and proctor when you register.

Realistic exam-week scenario

Day 1–4: Classroom + wet lab. You rotate through RP, DC, PVB, and SVB stands, learning hose order until you can set up without narrating every step out loud.

Final day morning: Written exam. Facilitator (not your instructor) verifies ID, issues scratch paper, starts the 2-hour clock on the 100-question closed-book test. You may use a non-programmable calculator.

Final day afternoon: Practical. Proctor assigns stations. One of your four assemblies is in fail mode—for example a fouled check or a relief that will not behave. You have 1½ continuous hours to complete all four tests with your 5-valve (or 3-valve) kit, no notes, using your school’s recognized procedure. You pass only if the proctor accepts all four demonstrations.

Treat that final day as two different sports played back-to-back: cognitive accuracy, then hands-on fluency under time pressure.