Santa Rosa Urban Reuse

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The City of Santa Rosa’s water recycling program provides high-quality water for agriculture, energy production and urban uses. Historically, this program was managed for its wastewater disposal benefit.  GHD assisted in the development of the City’s Incremental Recycled Water Program – a 30 year master plan for managing the system. We then led a consulting team tasked with evaluating a range of alternatives for expanding Santa Rosa’s urban water recycling program by up to 6600 acre-feet per year, as one piece of the incremental program.

Because of an increasingly constrained regional water supply, the benefits of urban reuse were studied by the water utility and wastewater utility in partnership. The analysis included over a dozen alternatives for system configuration and size and concluded that a 3000 acre-foot expansion provided the best value for both utilities.

GHD led the predesign activities for Urban Reuse including the development and establishment of system design criteria, water quality and polishing treatment analysis, pump station sizing and location analysis, transmission pipeline sizing and routing analysis, customer identification, distribution system sizing and routing analysis, storage tank site reconnaissance and storage tank site conceptual design.

We were also responsible for developing a recycled water User’s Guide to be made available to all customers that will be using Urban Reuse Project recycled water; see cover shown on the previous page. The User’s Guide includes the rules, regulations and guidance for design and operation of on-site recycled water facilities. The guide covers requirements for existing sites and new developments and will give the customer information necessary to meet all applicable regulations. Customer site facilities designed, constructed and operated on the basis of the User’s Guide will comply with all existing codes, laws, statutes and regulations concerning the use of recycled water. 

GHD also assisted with the public involvement outreach activities.



As the world’s population grows and our standards of living improve so does our need to manage the water in our environment. We need to maximise its application for human well-being and minimise impact on the environment. GHD engineers, scientists and planners can provide sustainable, cost-effective and innovative water solutions.  We assist water utilities and others who provide water services to optimise infrastructure and adapt to environmental changes in ways that balance the needs of our communities. And we enable clients to meet compliance, improve profitability and maintain their commitment to sustainability.

GHD continually expands the boundaries by engaging in research, enhancing existing systems and strategies, evaluating new procedures and transferring technology from other industries into the water industry. We work with our clients through all project stages planning, investigation, design, delivery, operation and renewal.

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