Executive Management
Prabhakar Somavarapu
District Engineer
Prabhakar Somavarapu was appointed District Engineer in June 2013. Somavarapu oversees the operations of both Sacramento Regional County Sanitation District (Regional San) and Sacramento Area Sewer District (SASD).
Somavarapu began his career with Regional San in 1996 in the Engineering Section at the Sacramento Regional Wastewater Treatment Plant (SRWTP). He later managed the Operations Support Group and Asset Management program at SRWTP. He then served as Regional San Director of Operations in charge of operations, maintenance, engineering, administration, construction programs and laboratory services for all Regional San treatment and conveyance facilities.
Ruben Robles
Director of Operations
Ruben Robles serves as Regional San’s Director of Operations. In this role, he is in charge of operations, maintenance, engineering, administration, construction programs and laboratory services for all Regional San treatment and conveyance facilities.
Robles began his career with Regional San in January 1992 in the Operations Support section. From September 2005 until his August 2010 appointment, Robles served as Principal Civil Engineer. During this time, he was responsible for the development of Regional San’s Asset Management program, recycling programs, discharge permitting and the long-range planning efforts for the collection and interceptor systems.
Christoph Dobson
Director of Policy and Planning
Christoph Dobson was appointed Director of Policy and Planning in July 2013. As director, he oversees the long-range planning efforts, rate and fee development, regulatory and legislative affairs, scientific research, wastewater source control and high-level policy development for both Regional San and the Sacramento Area Sewer District (SASD).
Dobson began his public sector career in 1992 with the Water Resources Division of Sacramento County. In 1993, Dobson joined Regional San and SASD as an Engineering Technician working in the GIS section. In 2006, he was named Director of Operations for SASD, where he was responsible for the day-to-day operations of the District.
Matthew Doyle
Director of Internal Services
Matthew Doyle was appointed Director of Internal Services in February 2020. As director, he’s responsible for overseeing information technology, fiscal administration, purchasing, warehouse, and training for both Regional San and SASD.
Prior to joining the executive management team, Doyle served SASD for 12 years as Safety and Regulatory Compliance Manager. In this role, he was responsible for the safety and wellness of more than 300 employees, ensured compliance with environmental regulations, and managed the Ordinance Enforcement Program. During his tenure with SASD, he established a proven track record of lowering SASD’s incident rate by 60 percent.
Doyle began his public sector career with Sacramento County Airport Systems, and prior to that, he worked in the private sector in Silicon Valley managing a number of technology manufacturing departments. He holds a Bachelor’s Degree from California State University, Sacramento in Health Science with a concentration in Occupational Health and Safety.
Nicole Coleman
Public Affairs Manager
Nicole Coleman was hired as the Public Affairs Manager in May 2018. In this role, she is responsible for managing communications, media relations, stakeholder awareness, community engagement, advertising, and social media for both the Sacramento Regional County Sanitation District (Regional San) and the Sacramento Area Sewer District (SASD).
Before joining the executive management team, Coleman served Regional San and SASD for 11 years in various Communications and Media Officer positions. In these roles, her responsibilities spanned managing multi-faceted and comprehensive communications campaigns, media relations, stakeholder engagement, and advertising.
Joseph Maestretti
Chief Financial Officer
Joseph Maestretti was hired as the Chief Financial Officer in April 2011. Prior to joining the team, Maestretti was employed with the City of Stockton starting in 1990. There he held multiple positions, including Capital Improvement Program Coordinator and ultimately Budget Officer. He also served the City as the Fiscal Manager of the Stockton Police Department from 1990 to 2006. Prior to that, Maestretti served as an Auditor and Audit Supervisor with the California State Auditor.
