Where tests are required as evidence of compliance with the code, the test reports shall be retained _____.

The requirement for retaining test reports as evidence of compliance with the code for the period required for retention of public records is crucial for ensuring accountability and traceability in plumbing installations. Public records are generally defined as documents that are not confidential and must be preserved for a certain duration, which can vary based on state laws or regulations. This period allows for later review or verification if necessary, ensuring that the information remains accessible for future reference or audits.

Choosing this option ensures that all relevant documentation related to plumbing compliance is maintained in accordance with broader public record-keeping practices, which serve to protect both the integrity of the work done and the rights of consumers, contractors, and regulatory bodies. Retaining records beyond arbitrary time frames provides a more robust framework for legal and operational responsibilities.