Generally speaking counties or municipalities provide water to cities as opposed to cities getting their own water from a source.
With that said Orange County, CA has won numerous awards, including the 2008 Stockholm Industry Water Award, for their water purification plant allowing for a sustainability water source. The Orange County Water District and the Orange County Sanitation District jointly developed the Groundwater Replenishment (GWR) system, a water purification system which will provide enough water to meet the needs of an additional 500,000 people without diminishing groundwater resources for current or future generations.
The GWR System diverts highly treated sewer water that is currently discharged into the ocean and purifies it through a series of advanced techniques: microfiltration, reverse osmosis, ultraviolet disinfection and hydrogen peroxide. The cleaned water is returned to the groundwater basin to increase both water supply and quality. The GWR system has established a blueprint for large-scale wastewater purification that is already being emulated in dry regions and nations, such as Singapore.
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