The wastewater utility produces recycled water used for irrigation of parks, golf courses, industrial 
cooling, and construction water. Currently, up to 20 percent of the treated wastewater is recycled 
annually. During the past year, Roseville delivered more than one billion gallons of recycled water to its 

Currently, storage limits our recycled water use during peak periods. We envision an innovative project 
that will improve storage and provide an opportunity for groundwater augmentation.  

We have learned from the recent four year drought in California that further diversification of our water 
supply portfolio is essential. Efforts are underway to identify future sustainable water supplies, including 
new diversion points for more surface water, increase management of our groundwater basins and 
contemplation of ways to use recycled water beyond just outdoor irrigation.   

One of the ways to increase the use of recycled water is through the installation of even more advanced 
treatment for groundwater augmentation. Because percolation ponds are not an option in this area due 
to heavy clay soils, an alternative would be direct injection into the underlying aquifer. We know the 
idea behind injection works in our groundwater basins because we’ve implemented similar injection 
storage techniques using potable surface water supplies.   

Advanced treatment for groundwater augmentation is typically accomplished by microfiltration 
followed by a microfiltration/reverse osmosis (MF/RO) process and some form of advanced oxidation. 
This technology is presently in use and has been accepted by regulatory authorities. The largest problem 
we face as an inland community with this technology is its inherent need for disposal of brine, which is 
generated during the RO process. There simply is no good way to dispose of large quantities of brine 
waste without access to an ocean discharge or deep well injection. An alternative advanced treatment 
approach is ozonation/biofiltration, which can provide advanced treatment without generating brine 
waste. Roseville is pursuing pilot studies to compare the efficacy of MF/RO technology side-by-side with 
ozonation/biofiltration systems and provide performance comparison findings to regulatory agencies for 
consideration as the program develops. 




Proactive leadership that engages in both internal organizational and broader external 
community priorities  


Establishes a participatory, collaborative organization dedicated to continual learning, 
improvement, and innovation   


Workforce and leadership development program in place to assure recruitment, retention, and 
competency of utility staff relative to a Utility of the Future business model. Development 
program includes a leadership and management skills training program that provides both 
formal and informal leadership opportunities for employees  


Employee “in-reach” program established to share work experiences and ensure greater 
understanding of the utility’s key strategy relative to the Utility of the Future business model 
Established an integrated and well-coordinated senior leadership team.  

• Senior leadership meets weekly to discuss utility goals and milestones