IEUA has developed a comprehensive resource efficiency and environmental management strategy that fully integrates and optimizes the region’s water, energy and biosolids.

WaterWater planning

Recycled water from IEUA’s wastewater treatment operations is an essential component of the Chino Basin’s long-term plan to achieve water reliability and security.  IEUA proactively develops the infrastructure needed to deliver all of its recycled water to beneficial uses in the region, and plays an important role in developing policies and programs that encourage use of recycled water for landscape irrigation and other approved purposes.  IEUA also participates in local, regional and statewide programs to conserve water and to reduce the use of potable water for non-potable uses.


IEUA continually seeks ways to reduce its energy consumption through efficient design and operations, and to increase production of renewable energy.  Sewage sludge from wastewater treatment operations is digested to produce methane.  Digester gas methane is used both to (1) heat the digesters, and (2) produce electricity.  In addition, IEUA is partnering with a provider of solar electricity to install 4 MW of solar photovoltaics on its properties.  IEUA is also investigating potential sites for in-conduit hydropower and wind.

organic biosolids diagram

Biosolids Management

IEUA reduces environmental impacts from the region’s dairy manure by digesting it to produce additional methane that is used to produce electricity for the Chino Basin Desalter, that creates potable water from brackish groundwater, and to produce additional electricity for IEUA’s wastewater treatment operations.


High quality compost is produced as a result of IEUA’s digestion of dairy manure.

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