Which regulatory body commonly oversees backflow prevention in a state?

The Department of Environmental Protection (DEP) is typically the regulatory body responsible for overseeing backflow prevention in a state. This is due to the DEP's focus on safeguarding the quality of water resources and ensuring compliance with environmental regulations. Backflow prevention is crucial for protecting public health and maintaining the integrity of the water supply; therefore, the DEP plays a vital role in implementing necessary policies, standards, and practices related to backflow prevention.

The agency is tasked with monitoring and enforcing regulations that ensure safe drinking water, which includes the implementation of backflow prevention measures to avoid contamination from cross-connections in water systems. The DEP often provides guidelines for testing, maintenance, and installation of backflow prevention devices, making it the primary authority in this area.

In contrast, other options such as the Department of Housing and the Department of Health Services may have limited involvement in water quality issues but do not primarily focus on backflow prevention. OSHA is mainly concerned with workplace safety and health regulations, not water supply system regulations.