Codes, Standards, and Regulations
The framework
Candidates must know how codes and standards interact. Model plumbing codes (such as the Uniform Plumbing Code and International Plumbing Code) set installation requirements, while consensus standards (such as those from ASSE, AWWA, and USC FCCCHR) define device performance and testing. Local ordinance gives the program its legal authority. The Safe Drinking Water Act and state primacy programs drive cross-connection control requirements for public water systems.
Know the standard families: ASSE standards cover device performance and tester professional qualifications; AWWA standards cover utility practices; USC FCCCHR publishes the manual of cross-connection control. A common trap is confusing a performance standard with an installation code, or citing a standard that does not govern the device in question.
Practical rules
- The most stringent applicable requirement governs when codes conflict.
- Devices must be listed by a recognized testing agency for the intended service.
- Tester certification must be current and from a recognized program.
- Installation must follow the manufacturer's instructions and the local code; where they conflict, the stricter requirement applies.
Worked example
A jurisdiction adopts a plumbing code that permits a DCVA for a non-health hazard, but the local ordinance requires RPZ for any chemical injection. The ordinance is stricter and governs. On an exam, when two requirements conflict, select the more protective one unless the question specifically asks which code has legal authority.