Scottsdale strengthens Water Resources leadership team to meet future demand

The city of Scottsdale is enhancing its Water Resources Department with new leadership appointments designed to support long-term water reliability, infrastructure investment and strategic planning.

Effective April 27, City Manager Greg Caton appointed Thyra Ryden-Diaz as interim senior director of Water Resources. A registered professional engineer, Ryden-Diaz brings more than 25 years of municipal engineering experience, including over two decades delivering capital projects for Scottsdale.

Ryden-Diaz began her career with the city in 1999 and has led major infrastructure efforts that support water reliability and future growth. Her experience includes work on advanced water treatment, large-scale development projects and complex system improvements. She holds a bachelor’s degree in civil engineering from Arizona State University and a master’s degree in public administration from Northern Arizona University.

“Scottsdale has a strong foundation when it comes to water resources, and we are focused on building on that strength,” Ryden-Diaz said. “Our team is committed to thoughtful planning, responsible investment and ensuring we continue delivering reliable, high-quality water service for our community.”

Caton said the leadership updates position the department to meet both current demands and future challenges.

“Water is one of Scottsdale’s most critical services, and we are aligning our leadership team to support the work ahead,” Caton said. “This structure strengthens our ability to plan for the future and continue providing dependable service to our residents and businesses.”

The updated leadership structure also includes:

• David Walby as assistant senior director, focusing on securing new water sources and supply. Walby brings 18 years of experience in water and wastewater operations, including advanced treatment and reuse systems.
• Bryan Cassens, assistant senior director, who continues to oversee core operational functions such as water production, treatment and system optimization.
• Jill Brumand, recently promoted to water policy manager, who will guide policy development and conservation efforts as regulatory and environmental conditions evolve.

The team will also be supported by Brian Biesemeyer, former executive director of Scottsdale Water, who will focus on advancing the Harquahala water project.

These changes come as Scottsdale continues to evaluate future water supply options, invest in infrastructure and respond to ongoing challenges affecting the Colorado River Basin and regional water resources.

The strengthened team will help ensure Scottsdale remains proactive in managing its water portfolio while continuing to provide reliable, high-quality service to residents and businesses.