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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.

Collection System Construction

  Dig Los Osos Logo , is a website developed specifically for the project collection system construction. With completion of pipeline installation, DigLosOsos is no longer being updated with new information.  However, information on the pipeline construction is still available to review.  DigLosOsos provided regularly updated schedules, maps of construction progress, information on expected traffic impacts, and contact information.

LosOsos Water Conservation

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

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 on-lot 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) 788-2114 or with comments or questions, or to schedule an appointment. 


Recent News and Events 

July 27, 2015: Project Construction Update for the month of June 2015.

June 26, 2015: Project Construction Update for the month of May 2015.

June 22, 2015: May 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.

May 28, 2015: Project Construction Update for the month of April 2015.

May 15, 2015: Project Construction Update for the month of March 2015.

March 31, 2015: A public tour of the Water Recycling Facility construction site was held on March 31, 2015. If you would like to come to the next tour, please contact Rosalyn Piza to be added to the list for the next upcoming tour (

March 30, 2015: Project Construction Update for the month of February 2015.

March 17, 2015: Board of Supervisors agenda Item 17 for a project update and approval of an agreement with Kevin Merk Associates for restoration and habitat enhancement at the Broderson site.  Read the staff report. Watch the meeting. Powerpoint presentation


News Archives


Available Assistance Program

Board of Supervisors

Document Library



Project Costs and Financial Assistance

Board of Supervisors Items



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Public Works is located in room 207B 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