Regional San owns and operates the regional wastewater conveyance
system and the Sacramento Regional Wastewater Treatment
Plant located near Elk Grove, California. We serve a
population of about 1.4 million in the region.
Regional San protects public health and the
environment by conveying, treating, and recovering resources from
wastewater responsibly and cost-effectively.
Regional San is a leader in environmental stewardship
and a trusted partner in regional sustainability.
At Regional San, we provide wastewater conveyance and treatment
services to residential, industrial and commercial customers
throughout unincorporated Sacramento County; the cities of Citrus
Heights, Elk Grove, Folsom, Rancho Cordova, Sacramento, and West
Sacramento; and the communities of Courtland and Walnut Grove.
(View a map of our
The wastewater is collected from customers’ homes and businesses
via sewer collection pipes operated by one of four local sewer
agencies. These pipes connect to our network of 169 miles of
interceptor pipelines, which convey the wastewater to the
Sacramento Regional Wastewater Treatment Plant. There,
approximately 130 million gallons of wastewater are treated each
day and safely discharged to the Sacramento River.
Regional San was formed in 1973, and in 1982, after years of
construction, the Sacramento Regional Wastewater Treatment Plant
began service. Regional San is governed by a 17-member Board of Directors representing all of the
jurisdictions we serve throughout the region.
After World War II, Sacramento grew rapidly, and wastewater
treatment plants popped up along the Sacramento and American
Rivers to serve the growing population. In the 1960s,
recreational interests and water supply needs began to prompt
concerns about wastewater discharge into local waterways. By the
1970s, more than 20 separate wastewater collection and treatment
systems were supporting 600,000 people in the region.
The Sacramento Regional Wastewater Treatment Plant employs
reliable treatment processes that mirror nature’s handling of
wastewater, with an important advantage: what nature might take
months to complete, the Plant accomplishes in about eight hours.
The following important steps take place during the wastewater
Thousands of miles of underground pipes transport wastewater
from homes and businesses throughout the Sacramento region to the
Sacramento Regional Wastewater Treatment Plant (SRWTP) in Elk
The largest of these pipes, called ”interceptors,” are
owned by Regional San. There are approximately 111 miles of
gravity interceptors hidden beneath the streets of Sacramento and
Yolo counties. Ranging in size from 36 to 144 inches in diameter,
each interceptor conveys at least 10 million gallons of
wastewater per day (mgd).
Thank you for visiting Regional San’s website. Regional San is
committed to protecting our customers’ privacy and does not,
without your knowledge and permission, collect personal
information about you or regarding the reasons for your visit.
Regional San will not resell or distribute any site-visitor data.
Unless you voluntarily provide personal information to us when
inquiring about or requesting specific services, we will not ask
you for, or track, any personal information for any purpose.
Regional San is committed to to providing a website that is
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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