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San Luis Obispo County, California

Public Works
Wade Horton


County of San Luis Obispo Public Works Department
Receives Prestigious APWA Accreditation

976 Osos Street
Room 206
San Luis Obispo, CA 93408
Map & Directions

Business Hours:
Monday through Friday
8:00 am - 5:00 pm

(805) 781-5252


(805) 781-1229

 > County Home Page > Public Works and Transportation > Los Osos Wastewater Project

Los Osos Wastewater Project

Mission Statement: To evaluate and develop a wastewater treatment system for Los Osos, in cooperation with the community water purveyors, to solve the Level III water resource shortage and groundwater pollution, in an environmentally sustainable and cost effective manner, while respecting community preferences and promoting participatory government, and addressing individual affordability challenges to the greatest extent possible.

Dig Los Osos logo circular

Phase 1 of the sewer lateral connections to the project will begin on March 28, 2016. Over the next year, property owners must have their private property connected to the system and decommission their septic system.  Review the Sewer Lateral Connections and Septic System Decommissioning page for more information.

LosOsos Water Conservation

 The County is currently implementing a water conservation program, which includes rebates for water saver fixtures.

All properties in this service area are required to meet the water conservation program guidelines prior to connection to the wastewater project

For more information on

the Los Osos Water Conservation Rebate Program, visit:



Representatives from the County are available to answer questions from residents and businesses regarding sewer lateral connections for their property, project costs, and answer any other issues related to the Los Osos Wastewater Project.

Meet with County staff during bi-weekly office hours at 2025 10th Street in Los Osos each Tuesday and Thursday from 10:00 am to 12:00 pm.


Contact the County at (805) 788-2759 or email with comments or questions.



Recent News and Events

June 22, 2016: Baseline Groundwater Quality Report released to the Regional Water Quality Control Board. This was an additional requirement under the WDR R3-2011-0001. This report contains the latest Nitrate concentrations and Groundwater levels.

June 6, 2016: A sewer lateral connection workshop for property owners in the Phase 2 connection area will be held on June 6, 2016 at the South Bay Community Center.  There will be 2 sessions held: 4:30 pm and 6:00 pm.

May 5, 2016: The Los Osos Water Recycling Facility is now open for tours every Wednesday at 10:00AM! Individuals or groups are welcome. Please RSVP and find additional information here

April 29, 2016: Project Construction Quarterly Update (January through March, 2016).

April 22, 2016: A dedication Ceremony and Ribbon Cutting was held at the Water Recycling Facility (2270 Los Osos Valley Road, across from Clark Valley Road) from 11:00 am to 12:30 pm.  The event was open to the public. 

April 12, 2016: Board of Supervisors consent agenda Item 6 to approve an agreement with Far Western Anthropological Research Group for providing archaeological services for the project lateral connections. Read the staff report.


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Project Costs and Financial Assistance

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Public Works is located in Room 206 of the old Courthouse building,

at 1035 Palm Street, on the corner of Palm and Osos Streets in San Luis Obispo.

The Public Works Department offices are open Monday to Friday 8:00 AM to 5:00 PM

General information phone number is (805) 781-5252