Which of the following best describes CAGRD's role?

CAGRD, or the Central Arizona Groundwater Replenishment District, primarily focuses on managing groundwater supplies to ensure the sustainability of water resources in Central Arizona. Its main role is to replenish groundwater supplies that are depleted due to various uses, including agricultural, municipal, and industrial demands. By employing strategies such as artificial recharge, the district helps maintain the balance of groundwater levels and supports regional water security.

Monitoring water quality, funding water projects, or regulating surface water rights are important functions within the broader context of water management, but they do not encapsulate the specific focus and responsibilities of CAGRD. Instead, the organization’s efforts are aimed at directly managing the groundwater resources to fulfill the needs of the community and environmental sustainability. This makes the description of managing groundwater supplies the most accurate representation of CAGRD's role.