In this section, you will find information about Regional San’s
current projects, ongoing planning efforts, and innovative green
From our new evolution in wastewater treatment—the EchoWater
Project—to our sustainable efforts in resource recycling, we are
committed to improving our operations while minimizing our
environmental impacts and maximizing reuse of treatment process
Regional San is undertaking a monumental effort—called the
EchoWater Project—to take our region’s wastewater treatment to a
whole new level.
In 2010, Regional San was issued stringent new treatment
requirements from the State of California that require us to make
the most significant upgrade to our wastewater treatment plant
since its original construction. This new system, which must be
in place by 2021-2023, will produce cleaner water for discharge
to the Sacramento River, as well as for potential reuse as
recycled water (e.g., for landscape and agricultural irrigation).
Recycled water is treated wastewater that has undergone
additional filtration and disinfection processes to make the
water safe for non-potable (non-drinking) uses. Since April 2003,
Regional San’s cutting-edge Water Recycling Program (WRP) has
provided an environmentally responsible and safe water supply for
non-potable purposes, such as landscape irrigation, industrial
uses, and environmental restoration.
Regional San’s biogas recycling program is just one of the ways Regional San works to reduce impacts to the environment by innovatively reusing valuable resources. Methane gas, or “biogas,” is a by-product of the solids digestion process that is used to produce steam and electricity at the Carson Ice-Gen Project, a cogeneration facility owned by Sacramento Municipal Utility District (SMUD) and located at the Sacramento Regional Wastewater Treatment Plant (SRWTP).
Regional San has developed a diversified biosolids management
program that is both environmentally friendly and of high value
to ratepayers. This two-pronged program consists of safely
Recycling biosolids into environmentally beneficial products
Applying biosolids to land disposal units
Each year, Regional San’s treatment plant processes
about 26,000 dry tons of biosolids, making the program one of the
largest producers of biosolids in California. Approximately 70
percent of those biosolids are treated and then injected into
on-site land disposal units, while the remainder is beneficially
recycled at our Biosolids Recycling Facility (a partnership
Regional San constructed a solar energy array at the Sacramento
Regional Wastewater Treatment Plant. The solar array is one
of the largest located at a wastewater treatment plant in the
nation. The solar array offers a clean and sustainable energy
source with several benefits.
Regional San entered into a power purchase agreement with Tesla
(formerly SolarCity) who will finance, own, and operate the
array. Under the agreement, Tesla will sell the power produced at
the site to Regional San for a 25-year term at a fixed
Much like Sacramento’s two rivers, which join together in a
“confluence” to create something even bigger, Sacramento Regional
County Sanitation District (Regional San) and the Sacramento Area
Sewer District (SASD) developed the Confluence Regional
Partnership Program to bring together ideas and efforts that
advance environmental, educational, and economic vitality in the
Sacramento region. Through this program, funding may be available
to projects that help the community and advance Regional San’s
and SASD’s missions, visions, values, goals, and objectives.
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accessible to the widest possible audience, regardless of
technology or ability. If you’re having trouble accessing
information on this site, or if you would like to bring a site
issue to our attention, please send us a message.
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