Which plumbing code stipulates the minimum standards for plumbing systems?

The Uniform Plumbing Code is the correct choice because it explicitly outlines the minimum standards and requirements for plumbing systems. This code encompasses all aspects of plumbing installation, maintenance, and safety, ensuring that plumbing systems are designed to protect the health of the public and the environment. It serves as a model code adopted by many jurisdictions, including some states, thereby establishing a standardized practice for plumbing professionals.

While the International Building Code pertains to general building standards, it does not specifically detail plumbing regulations. The National Electrical Code focuses on electrical systems and safety, and the International Fire Code is concerned with fire prevention and safety measures. Therefore, none of these codes directly address the minimum standards for plumbing systems like the Uniform Plumbing Code does.