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San Luis Obispo County, California

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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

Connection to the project will begin in March 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 page for more information.

The County held an informational workshop on January 23, 2016.  Follow this link for the meeting presentation and handouts.

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, visit

the new website devoted to the Los Osos Water Conservation Rebate Program



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.


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



Recent News and Events 

February 5, 2016: Project Construction Update for the month of December 2015.

January 23, 2016: Lateral Connection Workshop was held for the public on Saturday, January 23, 2016 from 1 pm to 4 pm at the Los Osos Middle School.  Three informational workshops presented information about the permit process and timeline, financial assistance for low income homeowners, options for reusing your septic tank to enhance water supply, and the opportunity to meet contractors who are interested in assisting with the work. Follow this link for the meeting presentation and handouts.

January 8, 2016: Project Construction Update for the month of November 2015. 

December 17, 2015: November 2015 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.

December 7, 2015: Project Construction Update for the month of October 2015.

November 5, 2015: San Luis Obispo County and Peoples’ Self-Help Housing invite you to attend an informational meeting to be held Thursday, November 5, at 6 p.m. at South Bay Community Center, 2180 Palisades Avenue, Los Osos CA 93412 to get more information about financial aid for low income and senior homeowners.  Download a copy of the Powerpoint Presentation, which is also available in Spanish version.

October 30, 2015: Project Construction Update for the month of September 2015.


News Archives


Available Assistance Program

Board of Supervisors

Document Library



Project Costs and Financial Assistance

Board of Supervisors Items



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.

Office hours are Monday to Friday 8:00 AM to 5:00 PM

General information phone number is (805) 781-5252