Crack the Illinois Plumbing Code Exam 2026 – Dive into Your Future with Confidence!

The correct answer is that all reduced pressure principle (RPZ), reduced pressure detector (RPDA), double check (DCA), and double check detector (DCDA) backflow prevention assemblies must be tested and approved before initial operation by a Cross-Connection Control Device Inspector. This is because the role of the Cross-Connection Control Device Inspector is specialized in the installation, testing, and maintenance of backflow prevention devices. This professional is trained to ensure that these assemblies function properly and meet safety standards to prevent backflow contamination in the public water supply.

Testing by an expert who is knowledgeable in the mechanics and regulatory compliance for backflow preventers ensures public safety and adherence to the Illinois Plumbing Code. Annual inspections by the same qualified personnel help maintain the integrity of these devices, which is critical in preventing cross-connections that could compromise the potable water supply.

While a Master Plumber may have substantial knowledge and skills in plumbing systems, their certification does not specifically encompass the unique testing requirements of backflow prevention assemblies like those of the Cross-Connection Control Device Inspector. Similarly, Professional Engineers and Building Inspectors have different scopes of practice that do not focus solely on backflow prevention systems.