In municipalities with a local plumbing inspector, testing shall be done in the presence of the inspector unless otherwise provided.

• A. It may be performed without an inspector in any case.
• B. It must be performed in the presence of the inspector unless otherwise provided.
• C. It may be skipped for minor repairs.
• D. It is only required for new construction.

Answer: (B)

The main idea is that when a municipality has a local plumbing inspector, the testing of a plumbing installation must be witnessed by that inspector, unless the local ordinance provides a different rule. This ensures the inspector can confirm that the system has been installed correctly and is leak-free before it’s approved.

So the correct approach is that testing must be done in the presence of the inspector unless the municipality has a specific provision allowing otherwise. The inspector’s presence helps verify proper connection, venting, drainage, and pressure or leak tests, giving the authority an opportunity to approve the work or request corrections on the spot.

Why the other ideas don’t fit: doing testing without an inspector would bypass this verification step, which local rules generally require. Skipping testing for minor repairs goes against the purpose of ensuring safety and code compliance, and restricting testing only to new construction ignores the broader requirement that applies to installations that require inspection in that locality.