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Whittier Narrows Water Reclamation Plant  
The Whittier Narrows Water Reclamation Plant (WRP) is located at 301 N. Rosemead Blvd., El Monte. The plant occupies 27 acres south of the Pomona (60) Freeway. The plant was originally constructed for the purpose of demonstrating the feasibility of large scale water reclamation. The original plant was placed in operation on July 26, 1962 and consisted of primary sedimentation and secondary treatment with activated sludge.
CURRENT OPERATION:
The Whittier Narrows WRP was the first reclamation plant built by the Districts in 1962. It provides primary, secondary and tertiary treatment for 15 million gallons of wastewater per day (see flow diagram below). The plant serves a population of approximately 150,000 people. Virtually all of the purified water is reused as groundwater recharge into the Rio Hondo and San Gabriel Coastal Spreading Grounds or for irrigation at an adjacent nursery. Click on the diagram to read about the wastewater treatment and water reclamation process. 
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