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Government » Department Directory » Utilities Department

Water

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  • A aerial image taken of the construction work to build the new groundwater well in San Luis Obispo near the Bob Jones Trail
    New Groundwater Well Under Construction

    We're building a more resilient water supply for the City!

    Learn more
  • A picture of Pismo Beach, California
    Get Involved in the Future of Local Water

    Provide input on SLO County's DESAL Plan!

    Learn more
  • City of SLO Water Rebate Program
    Water Conservation Rebate Program

    Water customers can now receive a rebate for upgrading to water-efficient devices.

    Learn more
  • Construction Water Permit

    Applications for 2024-2025 Construction Water Permits will open soon!

    Learn more

Get to know YOUR Water 

We know the community of San Luis Obispo cares about water. That’s why the City of San Luis Obispo has invested in multiple water sources to meet its water supply needs. The City has four primary water supply sources including Whale Rock Reservoir, Salinas Reservoir, Nacimiento Reservoir, and recycled water. Historic groundwater wells have also been kept in operable, stand-by positions in the event that they are ever needed.  Currently, the City has a water supply portfolio that allows for the safe and continuous use of up to 10,000 acre-feet of water each year, which well exceeds its annual need of about 4,700 acre-feet per year. To see  the City’s current reservoir capacities go here.

The City remains committed to the responsible management of the community’s water supplies. Because of work conducted during and after the 2011-2015 drought, such as the participation in the production of a Groundwater Sustainability Plan (GSP) to better understand groundwater supplies and availability, the acquisition of an additional 2,200 acre-feet of water from Nacimiento Reservoir each year, and upgrading the Water Resource Recovery Facility (WRRF) to allow for expanded use of recycled water, the City is positioned to handle periods of limited rainfall. The lessons learned from past droughts continue to drive proactive planning and position the City to maintain a reliable and resilient water supply. The City constantly reassesses water availability and strives to provide clear communication to the public regarding forecasted conditions and any potential community impacts.

  • Water Sources

    Water Sources

    Learn where the City gets it's water from.

  • Distribution System

    Distribution System

    A complex delivery system designed to provide continuous drinking water and fire suppression.

  • Water Treatment

    Water Treatment

    The water treatment plant provides clean, safe drinking water every day of the year.

  • A graphic showing the underground water pipes that the City of San Luis Obispo owns and which ones Property owners own.

    Lead Service Line Info

    Learn about water service lines and how the City ensures water-safety!

  • Water Conservation

    Conservation

    Help continue to make water conservation a San Luis Obispo Way of life.

  • Plumbing Retrofit Program

    Plumbing Retrofit Verification Program

    Learn how to get your property's indoor plumbing certified.

  • Drought

    Drought

    See what the City of San Luis Obispo has done and continues to do to prepare for drought.

  • button to learn about your water meter

    Understanding Your Water Meter

    Learn how to read and identify leaks using your water meter

  • over irrigation water waste

    Report Water Waste

    Water conservation is a San Luis Obispo way of life. Help us save water by reporting instances of water waste

  • button to access information about your annual sewer cap

    Sewer Cap

    Learn how your annual sewer cap is calculated

See the latest news

  • A picture of construction crews paving the road on Sacramento Drive in San Luis Obispo

    SLO in Motion Update – Dec. 13, 2025

    Paving is expected to continue on Sacramento Drive.

    12/13/2025 10:00 AM

  • Aerial image of curb ramp work on Tank Farm Road and Poinsettia Street in San Luis Obispo

    SLO in Motion Update – Dec. 6, 2025

    Curb ramp work is wrapping up on Tank Farm Road.

    12/06/2025 10:00 AM

  • A picture of the newly reworked King Trail overlooking sweeping views of San Luis Obispo

    What to know about SLO’s Sewer Cap

    Learn about SLOs annual Sewer Cap period and what it means for residents looking to save money.

    12/05/2025 1:30 PM

  • Cal Poly campus with Bishop Peak in the background

    Dec 2 Council Meeting Recap

    The San Luis Obispo City Council met on Tuesday, December 2, 2025, and made decisions that will affect the list of historic properties in San Luis Obispo, increase sewer capacity as housing production increases, allow for sidewalk improvements, and move a long-awaited park project forward.

    12/04/2025 3:52 PM

  • The garden level of City Hall featuring the entrance to the Finance Department and IT.

    Finance Public Counter to Close Friday, Reopen at City Hall on Monday

    With the Finance Public Counter temporarily closed, here is how you can buy bus passes, pay your water or sewer bill, or drop off payments and more!

    12/03/2025 3:00 PM

  • Closed sign over picture of City Hall

    Many City Offices to Close for About Two Weeks This Holiday Season

    Do you have business to conduct with the City before the end of the year? Keep in mind that many City offices and public counters will be closed for the holidays.

    12/02/2025 11:10 AM

FAQ Box

  • How do I learn more about my drinking water?

    The City of San Luis Obispo encourages people to learn more about their drinking water. Learn more at:

    Centers for Disease Control and Prevention https://www.cdc.gov/drinking-water/index.html

    U.S. Environmental Protection Agency http://water.epa.gov/drink/

    You can also contact the US EPA Safe Drinking Water Hotline at 1-800-426-4791.

  • Why is chlorine added to City water?
    To protect drinking water from disease-causing organisms, or pathogens, water suppliers add a disinfectant, such as chlorine. The practice of disinfection has nearly eliminated most acute waterborne diseases such as dysentery, typhoid fever, and cholera in the United States. However, disinfection practices can be complicated because disinfectants themselves can react with naturally occurring materials in the water to form by-products (Total Trihalomethanes -TTHM’s) which might potentially pose health risks. It is critical to provide protection from pathogens using disinfection, while simultaneously reducing potential health risks to the population from disinfection by-products.
  • Does the City use chlorine or chloramines?
    Chlorine is added as our secondary disinfectant to ensure the water is safe as it travels through our distribution system to our customers.  We do not use chloramines.
  • What is done to make the water safe to use?

    The City water system is regulated by the State Water Resources Control Board – Division of Drinking Water.  All of the water from surface water sources is treated at the City’s Water Treatment Plant through a very thorough treatment process.

  • How much water is treated each day?
    Approximately 5.5 million gallons are treated and used each day in the City.
More FAQs
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Administration, Utilities
Floyd, AaronUtilities DirectorEmail

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San Luis Obispo, CA 93401

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