Encina Wastewater Authority

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Sustainability: by the Numbers

million gallons treated per day
million gallons recycled per year
electricity generated on-site

About Encina

The Encina Wastewater Authority (EWA) provides reliable and fiscally responsible wastewater treatment and resource recovery services to over  379,000 residents and businesses throughout a 125-square-mile service area of North San Diego County. Located in Carlsbad, California, the agency provides essential services for protecting the local ocean environment, preserving public health and providing valuable water resources for the region.



The Encina Water Pollution Control Facility (EWPCF) was originally constructed in 1965, which included a 4.5 million gallons per day (MGD) treatment plant and ocean outfall. Over the years, the plant has gone through several major expansions that have: increased the quality of treated water; improved odor control; added a cogeneration facility that generates electricity; upgraded the solids treatment process to produce a high-quality fertilizer product; and increased treatment capacity to 43.3 MGD. EWA's long-term Capital Improvement Program ensures that the EWPCF is able to handle future growth and meet increasingly stringent environmental regulations.


As an environmental leader, EWA provides reliable and fiscally responsible wastewater services to the communities we serve while optimizing the use of renewable resources.


To be a leader
in waste resource management
for the communities
we serve.

Encina JPA Member Agencies

Who We Serve

EWA is owned by six public agencies and governed by a Joint Powers Authority (JPA) that facilitates cost sharing and enables economies of scale the owners could not achieve independently. The JPA was founded in 1961 by the communities of Carlsbad and Vistawhich formed a partnership for the purpose of building a joint facility to treat wastewater. Over the next decade, the agency was joined by the Buena Sanitation District, Vallecitos Water District, Leucadia Wastewater District and City of Encinitas.

Vallecitos Water District
City of Carlsbad
City of Vista
City of Encinitas
Leucadia Wastewater District


  • CWEA San Diego Plant of the Year
  • EPA Green Power Partner
  • NACWA Peak Performance Award
  • Government Financial Officers
       Association CAFR Award

Contact Us

Encina Wastewater Authority
6200 Avenida Encinas
Carlsbad, CA 92011

  (760) 438-3941