Journeyman Plumber 2 Exam Questions & Answers 2026 (21–30)

Question 1

How often must most backflow prevention assemblies be tested after installation, per standard cross-connection control program requirements?

TheoryPractice · Accepted Answer

At least once per year. Most jurisdictions require backflow prevention assemblies to be tested at installation and then at least annually to verify proper mechanical function. The annual test ensures moving parts have not corroded, fouled, or otherwise failed.

Question 2

Who is qualified to test a backflow prevention assembly?

TheoryPractice · Accepted Answer

A certified backflow prevention assembly tester approved by the local water purveyor or authority having jurisdiction. Testing backflow assemblies requires specific knowledge of test procedures and equipment. Most jurisdictions require testers to hold a certification specifically for backflow assembly testing, issued or recognized by the local water authority, separate from a general plumbing license.

Question 3

During a field test of a Double Check Valve Assembly (DCVA), a tester finds that Check Valve 1 holds but Check Valve 2 leaks slowly. What is the correct action?

TheoryPractice · Accepted Answer

Fail the assembly and arrange for repair or replacement before returning to service. Both check valves in a DCVA must hold independently with no leakage past the seat. A leaking check valve means the assembly fails the test and must be repaired or replaced before it is returned to service protecting the potable water system.

Question 4

When testing an RP assembly, what does it indicate if the differential pressure across the first check valve reads LESS than 5 psi?

TheoryPractice · Accepted Answer

The first check valve is fouled or weakened and not providing adequate differential, indicating a fail condition. ASSE 1013 requires the first check valve of an RP to maintain at least 5 psi differential. A reading below 5 psi means the check is not holding the required differential — it is fouled, worn, or damaged — and the assembly fails the test and must be repaired.

Question 5

What test kit component is used to measure the differential pressure across check valves in a backflow preventer test?

TheoryPractice · Accepted Answer

A differential pressure gauge (manometer) with test hoses and fittings. A differential pressure gauge (often a double-gauge manometer with test hoses) measures the pressure difference between two points simultaneously, which is necessary to evaluate check valve differential in an RP or DCVA. A single Bourdon gauge can only read one pressure at a time.

Question 6

Before testing a backflow prevention assembly, the tester should notify whom?

TheoryPractice · Accepted Answer

The building owner or occupant so that service interruption is expected. Testing an assembly requires briefly shutting off the downstream water supply, which can interrupt service to the building. Notifying the owner or occupant beforehand prevents unexpected disruptions and is a professional standard.

Question 7

Which ASSE standard covers performance requirements for Reduced Pressure Principle Backflow Preventers?

TheoryPractice · Accepted Answer

ASSE 1013. ASSE 1013 is the product standard for Reduced Pressure Principle Backflow Preventers. Each backflow device type has its own ASSE standard (e.g., ASSE 1015 for double checks, ASSE 1020 for PVBs).

Question 8

Which ASSE standard governs Double Check Valve Assemblies (DCVA)?

TheoryPractice · Accepted Answer

ASSE 1015. ASSE 1015 sets the performance requirements for Double Check Valve Assemblies. Knowing the specific standard is important for selecting, installing, and testing backflow preventers in accordance with the authority having jurisdiction.

Question 9

The USC Foundation for Cross-Connection Control and Hydraulic Research is significant because it does which of the following?

TheoryPractice · Accepted Answer

Develops the Manual of Cross-Connection Control used as a reference standard by many water utilities and jurisdictions. The USC Foundation's Manual of Cross-Connection Control is the widely referenced technical guide for cross-connection control programs. Many water utilities and states adopt its recommendations for device selection, installation, and testing procedures.

Question 10

Which EPA rule under the Safe Drinking Water Act (SDWA) most directly motivates utilities to enforce cross-connection control by requiring distribution system integrity?

TheoryPractice · Accepted Answer

The Total Coliform Rule — positive coliform samples can trigger investigation of cross-connections and distribution system breaches. The Total Coliform Rule (TCR) requires utilities to investigate any positive total coliform sample, which may lead to identifying cross-connections as contamination sources. This regulatory pressure directly motivates utilities to maintain and enforce cross-connection control programs.

Journeyman Plumber 2 Exam Questions & Answers 2026 (21–30)

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