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About the Encina Wastewater Authority The Encina Wastewater Authority (EWA) is a public agency located in Carlsbad, California. EWA provides wastewater treatment service to approximately 300,000 residents in northwestern San Diego County. EWA is owned by six public agencies in a unique arrangement called a Joint Powers Agreement. Under this Agreement, these agencies agree to share in the costs and management of EWA in order to get more economical and high-tech facilities than they could get on their own. The six owners are:the City of Carlsbad, City of Vista, City of Encinitas , Vallecitos Water District, Buena Sanitation District, and the Leucadia County Water District.

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