District operates the Meadowlark facility, which recently underwent a $23.5-million upgrade
Vallecitos Water District, operator of the Meadowlark Water Reclamation Facility, which recently underwent a $23.5-million upgrade to improve operations efficiency and increase recycled water output capacity, was named “2008 Recycled Water Agency of the Year” (for medium sized agency) at the WateReuse Association’s 2009 California Section Annual Conference on March 23, 2009. The WateReuse Association is a nonprofit organization whose mission is to advance the beneficial and efficient use of water resources.
This recognition can be attributed in part to the upgrades that took place at Meadowlark between 2005 and 2008 that more than doubled output capacity from 2.25 million gal per day (mgd) to 5 mgd. The complete overhaul included changes to processing, odor control, reliability, cost effectiveness and visual impacts.
With the ultimate goal of lowering overall demand for imported water into the region and reusing local resources, this conservation-driven project will generate enough revenue to cover the additional costs required to treat the wastewater to tertiary level, by selling the recycled water it produces to other nearby water agencies – Carlsbad Municipal Water District (3 mgd) and Olivenhain Municipal Water District (1.5 mgd). By upgrading the plant, Vallecitos now has the ability to recycle up to 72% of the wastewater generated in their service area.
But overall efficiency doesn’t stop there. When the demand for recycled water slows, for example during rainy weather, the water can be stored in a 55-million-gal open reservoir for later use. Once the water is transported from the reservoir, it is delivered by gravity flow, which saves energy as pumps are not required.
Meadowlark was originally built in 1958 as a wastewater treatment plant, and was rebuilt in 1981 as a water reclamation plant. It has received many accolades, including the San Diego Plant of the Year award in 1994 from the California Water Environment Association.