Orange County Water District
Water Factory 21
10500 Ellis Avenue
Fountain Valey CA 92728-8300
TEL: 714-378-3200
FAX: 714-378-3373
Web Page: http://www.ocwd.com
Mailing Address:
P. O. Box 8300
Fountain Valley CA 92728
William R. Mills, Jr., P.E., General Manager
Ron Wildermuth, OCWD Public Information Officer
TEL: 714-378-3351
Pager: 714-291-8124
EMAIL: rwildermuth@ocwd.com
Greg L. Leslie, P.E., OCWD Engineer

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*5MGD RO-treated brackish water
 9MGD carbon adsorption-treated wastewater
 8.6MGD deep well water
 Total = 22.6MGD (blended)
 Net new water: 14MGD
Product water is available as potable water in drought years; the groundwater injection (GWI) reduces by 13MGD the wastewater otherwise discharged to the ocean

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source: http://www.ocwd.com/Pages/WF21.HTM

The first blended reclaimed water from Water Factory 21 was injected into the coastal barrier in October 1976. Several alternative sources of water were thoroughly evaluated for the seawater barrier injection program, including deep well water, imported water, reclaimed waste-water, and desalted seawater. The source of injection water finally adopted for Water Factory 21 is a blended combination of deep well water and recycled secondary effluent supplied by the Orange County Sanitation District (OCSD).

The recycled product water from Water Factory 21 meets drinking water standards through treatment using advanced processes. Recycled water was chosen for many reasons. Cost was a definite consideration, but even more important were the environmental advantages:

-- Reduction of 15,000 acre-feet of wastewater discharged to the ocean annually.

-- Reduction of dependency on State Water Project and Colorado River supplies.

-- Constant availability of reclaimed water supply; seawater intrusion barriers are last priority when imported supplies are diminished by drought or emergency interruption of importation systems.

Water Factory 21 product water is a blend of five million gallons per day (MGD) reverse osmosis-treated water, nine MGD carbon adsorption-treated water, and 8.6 MGD deep well water. This blend, with a total dissolved solids (TDS) content of 500 milligrams per liter (mg/L) or lower, meets all California Department of Health Services primary and secondary drinking water standards.

Product water also complies with the injection requirements of the California Regional Water Quality Control Board, Santa Ana Region. The use of recycled water, at a cost comparable to that of less dependable imported supplies, has rendered the project virtually drought proof.

Water Factory 21 reclaims approximately 15 MGD, and, with the deep well water used for blending, produces 22.6 MGD. The blended injection water not only protects the basin from saltwater intrusion, but also replenishes aquifers from which 50 percent of the county's water is drawn.

The plant's treatment train includes chemical clarification, recarbonation, multimedia filtration, granular activated carbon, reverse osmosis, chlorination and blending. All processes are discussed fully on the next pages.

source: http://www.ocwd.com/Pages/WF21.HTM