To which agency must all installations of LP Gas on roofs of buildings be reported?

The correct choice reflects the requirement to report installations of LP Gas on roofs of buildings to the local fire department. This is crucial for ensuring safety and adherence to local fire codes, as LP Gas can pose significant risks if not installed and monitored correctly. The local fire department is responsible for fire safety regulations and has the authority to ensure that all gas installations meet safety standards to prevent hazards such as leaks or explosions.

In contrast, the other agencies listed serve different regulatory functions. The State Health Department's focus is primarily on public health issues rather than fire safety. The Environmental Protection Agency oversees environmental regulations and pollution control, which is not specifically related to the immediate safety concerns of gas installations. The Occupational Safety and Health Administration, while concerned with workplace safety, does not specifically manage the reporting of LP Gas installations on building roofs, as their domain covers broader occupational hazards. Each agency has its own set of responsibilities, making the local fire department the appropriate authority for this matter.