Dominion staff

Mary Kay Provaznik, P.E., M.B.A.

General Manager

As Dominion Water & Sanitation District’s General Manager, Mary Kay has led the development and management of the water, wastewater, and storm water systems and infrastructure to serve the Sterling Ranch master-planned development and neighboring Douglas County water and wastewater service providers. Sterling Ranch broke ground in June 2015 as a 3400-acre water efficient community south of Chatfield Reservoir planned for up to 12,000 residential homes, and is the first community in Douglas County to incorporate renewable water into its portfolio from inception.  

Over the last 10 years, Mary Kay has championed sustainable approaches to water supply that develop and fully utilize regional infrastructure to minimize costs for all participants. She has led the State’s only precipitation harvesting pilot project - recognizing the potential of local precipitation capture as an important and cost effective renewable water supply for Dominion and for the State of Colorado.  Along with her locally focused approach on demand management and water conservation, Mary Kay serves as president of the WISE Board, and has been facilitating Dominion’s partnerships with 8 other districts and water providers, State agencies, Douglas County, and other regulatory agencies and authorities.  Dominion continues to develop its robust conjunctive water supply portfolio through these partnerships and through the on-going development of innovative concepts such as integrating precipitation harvesting and storm water management into a robust and sustainable water supply system.

Prior to her role with Dominion, Mary Kay was an engineering consultant for Leonard Rice Engineers and HDR.  Mary Kay earned her bachelor and master degrees in Civil Engineering from the University of Nebraska, and EMBA from Daniels College of Business.

Sarah Stone, P.E., M.B.A.

Business Operations Manager

Sarah Stone joined Dominion Water & Sanitation District in July 2017 as the Manager of Operations. She is responsible for the operations and maintenance of the district including the implementation of water supply contracts, planning and operational modeling, and supervision and quality of work performed by consultants providing such services to the district. 

Prior to coming to Dominion, Sarah worked as a project manager at CH2M. She has 15 years of experience in providing financial analysis, financial modeling, hydraulic modeling, and project management to small and large Colorado water and wastewater districts. She has served in varying roles for major large water projects, such as the Prairie Waters Project.


Sarah brings her expert knowledge in strategic planning, water and sewer rates setting, and in planning water systems to Dominion. Combined water systems planning and financial analysis skills, Sarah provides a unique operations and management background to Dominion.

Sarah is a Denver native, and earned her Bachelors of Science in Civil Engineering with an emphasis in Hydraulics at Colorado State University. She earned her Masters in Business Administration with an emphasis in Finance from the University of Colorado – Denver. Sarah is a registered Professional Engineer in Colorado.

Bob Neal, P.E., M.B.A.

Engineering and Field Operations Manager

Bob Neal was hired as the Engineering and Field Operations Manager for the District in 2019.  He is excited to be involved in the development and growth of Dominion Water & Sanitation District.  Much of Bob’s work experience has been in the field of wastewater treatment. 

Bob worked for the Metro Wastewater Reclamation District (MWRD) for 24 years.  Some of the larger projects he was involved in included being the District project manager on the design of biological nutrient removal facilities for both the North and South Secondary treatment processes.  He also managed the design of the conversion and rehabilitation of the primary clarification system to thin sludge pumping coupled with gravity thickeners.  Bob was also the project manager for several transmission pipeline installation and rehabilitation projects.  The largest one being the design and construction of the South Platte Interceptor which conveys flows to MWRD’s new Northern Treatment Plant.  

After retiring from the MWRD Bob worked for the City of Greeley as the Chief Engineer and Operations Manager.  As the Operations Manager, Bob was responsible for the continuous operation of two water treatment plants, water transmission and distribution infrastructure, wastewater collection and treatment.  The Operations Division is comprised of approximately 100 staff members.  One of Bob’s proudest accomplishments was the initiation, development and on-going construction of a replacement 20 MGD treatment train at the Cities main water treatment plant.  The facility being replaced was initially constructed in 1946 and in dire need of significant rehabilitation.  Bob was also successful at implementing the first use within the City of the alternate delivery method, construction manager at risk (CMAR), for the design and construction of this project. 

Bob is looking forward to helping to bring the Chatfield Basin Water Reclamation Facility back into service to meet the needs of on-going development within the District.

Sheri Addis

District Administrator

Sheri joined Dominion Water & Sanitation District as the District Administrator in November 2020.  She is excited to be a part of the Dominion Team and will assist with overseeing Special District requirements, board meetings, contract administration and manage the daily internal operations of the Dominion Office.

Prior to coming to Dominion, Sheri worked for Triumph Energy Partners, an oil and gas exploration company in Oklahoma.  Sheri was responsible for the negotiation, consolidation, and management of the contracts for the sale of Triumph’s oil and gas.  She worked closely with midstream companies and field operations to ensure consistency and accuracy of the sale of these assets.  She participated in various energy management seminars and training to further her knowledge base in the energy sector.  Additionally, Sheri multi-tasked as the Office Administrator, Human Resource Specialist and Benefits Coordinator with Triumph.

Sheri is a native of Colorado and returned after being away for 30 years.  She graduated from the Community College of Denver with a degree as a Paralegal and then from Northeastern State University with a degree in Education.  She worked in the legal field for over 13 years and in education for over 12 years. Bob is looking forward to helping to bring the Chatfield Basin Water Reclamation Facility back into service to meet the needs of on-going development within the District.

Evan Bahn

Water System Analyst

Evan Bahn joined the Dominion team in February 2020 as a Water System Analyst for the District. Evan works closely with the Business Operations Manager in planning and operational modeling, water resource planning, and water quality modeling and analysis. Evan also works with the District’s Engineering and Field Operations Manager with regard to system operations for the District.


Evan graduated from Metropolitan State University of Denver with a Bachelor of Science degree in Land Use: Environment and Resources. He began his career as an intern with Southgate Water & Sanitation District. After his internship at Southgate WSD, he joined the Castle Rock Water team as a Water Quality Technician and quickly moved into the role of Regulatory & Water Quality Compliance Analyst. Evan holds certifications as a Water Treatment Operator-class C, Water Distribution System Operator-class 3, and Collections System Operator-class 1. Evan brings experience in drinking water compliance, water treatment, water distribution, water quality sampling and analysis, data analysis, and regulatory analysis.

Brenda Friesen 

Administrative Support Assistant

Brenda joined Dominion Water & Sanitation District in August 2019. She supports daily internal operations, records management, and special projects for the team. 

© Dominion Water  & Sanitation District