Public Works Services


ADA Transition Plan

The ADA required that public entities draft a transition plan to be completed by July 26th, 1992. The ADA Transition Plan was to identify any structural changes necessary to achieve program accessibility.

Adelaida Area Hydrogeologic Study

The San Luis Obispo County Flood Control and Water Conservation District is coordinating with the U.S. Geological Survey (USGS) and the Upper Salinas-Las Tablas Resource Conservation District (RCD) to conduct a groundwater study in the Adelaida area west of the City of Paso Robles (click here to view an interactive map of the preliminary study area). The goal of this study is to provide a better understanding of the groundwater conditions in the Adelaida area so that informed decisions can be made about managing local water resources.

Please visit the links below for additional information.


The Adopt-A-Road program allows the public to directly contribute to roadside maintenance through litter collection and removal. In addition to the aesthetic benefits of cleaner and more beautiful roadsides, participants help to prevent potential pollutants from entering our waterways. Participating in the Adopt-A-Road program is a great way to promote civic responsibility and community pride.

Animal Services Facility

New animal services facility being constructed at the County Operations Center off Highway 1. The County Board of Supervisors awarded the Design-Build contract for the County’s new animal services facility project to F&H Construction. The new facility will replace the outdated 43-year old public animal shelter that has deteriorated beyond repair.

This project was authorized as a joint effort between the County and Cities of Atascadero, Arroyo Grande, Grover Beach, Morro Bay, Paso Robles, Pismo Beach, and San Luis Obispo. When complete, the new facility will meet the community’s needs by providing an inviting facility for pet adoptions and allow for the humane care of sheltered animals decades into the future.

Archived Paso Basin Advisory Committees

Paso Basin Advisory Committee (PBAC)

Prior to GSA formation, there was an advisory body with the purpose to advise the County Board of Supervisors, acting either as the San Luis Obispo County Flood Control and Water Conservation District or San Luis Obispo County, concerning policy decisions relating to:

  • Implementation of the Basin Groundwater Management Plan
  • Development of an “enhanced” Groundwater Management Plan for the Basin
  • Formation of a new water district
  • Transition of an initial County-supported district to an independent district
  • Other policies and ordinances
  • To serve as a public forum to discuss and collect comments on Basin issues

The Advisory Committee's term ended after the January 21, 2016 meeting. Please click the archived documents below to review bylawsmeeting guidelines and practice to which this body adhered.

Archived Documents


  • Click here for information regarding the six ad-hoc committees of the PBAC

Blue Ribbon Committee for the Paso Robles Groundwater Basin Plan

Archived Documents

Arroyo Grande Groundwater Basin

Due to the final results of DWR’s groundwater basin boundary modifications in 2019, the Santa Maria River Valley – Arroyo Grande (No. 3-12.02) Subbasin (AG Subbasin) and Santa Maria River Valley – Santa Maria (No. 3-12.01) Subbasin (Santa Maria Subbasin) were established as separate subbasins within the previous Santa Maria River Valley Basin (No. 3-12). The Arroyo Grande Subbasin is approximately seven miles long, oriented in a northeast-southwest direction, extending from Lopez Dam to the adjudicated area boundary (approximately coincident with the Wilmar Avenue Fault and Highway 101). The tributary valley of Tar Springs Creek is about three miles long, oriented east-west, and joins Arroyo Grande Creek about three miles upstream of Highway 101. Land surface of Arroyo Grande Creek valley extends from an altitude of about 380 feet Above Mean Sea Level (AMSL) at the base of Lopez Dam to about 100 ft AMSL at the bottom of the valley. Tar Springs Creek Valley extends from an altitude of about 360 ft AMSL to 160 ft AMSL at the confluence with Arroyo Grande Creek. Mountain ridges on the north side of the valley rise steeply to elevations of over 1500 feet AMSL near Lopez Dam.

Atascadero Groundwater Basin

The "Atascadero Area Subbasin", DWR Bulletin 118 Basin No. 3-004.11, was subdivided from the "Paso Robles Area Subbasin" (of the Salinas Valley Groundwater Basin) in 2016 based on information that showed the Rinconada Fault is a significant barrier to groundwater flow. The Paso Robles Formation makes up most of the water-bearing sediments for both subbasins and the lateral (outer) extents are primarily defined by the contact with the Monterey Shale (bedrock). The boundary between the Paso Robles Subbasin and the Atascadero Subbasin is defined by the Rinconada Fault.

In 2015, the State legislature approved a new groundwater management law known as the Sustainable Groundwater Management Act (SGMA). SGMA requires that high and medium priority basins comply with the new law. DWR has designated the Atascadero Groundwater Basin as a very low priority basin. 

Avila Beach Drive at Highway 101 Interchange

Reconfigure the US 101 and Avila Beach Drive Interchange to reduce delay.

Bicycle Advisory Committee

The Bicycle Advisory Committee (BAC) promotes the expanded use of bicycle transportation throughout San Luis Obispo County.

Bridge Maintenance and Replacement Program

The Bridge Design Group executes the County’s Capital Plan for the improvement of the County’s bridges, culverts and other structures through the effective and economic utilization of human and fiscal resources in the preparation and review of engineering reports, detailed design plans, technical specifications and construction contract documents.

Building Permit Review

This service is to evaluate building permits for drainage, stormwater, erosion control, flood hazard, and driveway encroachments.

Bus/Transit Passes

Purchase bus passes for RTA (Regional Transit Authority) & SCT (South County Transit).

Capital Projects 5 Year Plan

The County of San Luis Obispo Facilities and Infrastructure five year Capital Improvement Plan (CIP) is a multi-year planning tool design to identify facilities and infrastructure improvements with estimated costs exceeding $100,000 over the next 5 years. The plan is available in the form of the CIP and first 9 appendices detailing the project selection, funding, and other details, with appendix 10 including the individual project information sheets for every planned CIP.

Capital Projects Map

Identifies and tracks capital projects throughout the County.

Cayucos Vets Hall Restoration

This project will stabilize, rehabilitate and restore the Cayucos Veterans Memorial Building (also known as the historic Cass Warehouse) at Cayucos State Beach and create a safe and usable facility for community activities. As a historic building that meets the criteria required for listing in the California Register of Historical Resources,the design for the rehabilitation will follow the Secretary of the Interior Standards for the restoration of historic buildings.

Cloud Seeding Program for Lopez Lake

The County of San Luis Obispo Flood Control and Water Conservation District (District) recently initiated Year 2, of a potential 3-year program of the Winter Cloud Seeding Program for Lopez Lake (Zone 3). The project objective is to increase precipitation in the Lopez Lake watershed during winter precipitation events. The seeding program will use a combination of ground-seeding sites and aircraft. For more information, please see Project Updates below.

Co-Located Dispatch Facility

The County of San Luis Obispo is in the process of designing and constructing a new Co-Located Dispatch Facility. The Co-Located Dispatch will be located at the County Operations Center off Highway 1. When complete, the facility will replace two antiquated and overcrowded dispatch centers with an efficient, state-of-the-art facility that is able to meet Cal Fire/SLO County Fire and Sheriff Dispatch growing emergency service response needs.

Figure 1 below shows a conceptual layout of the Co-Located Dispatch Facility Site Plan.


Committees & Programs

View upcoming events for all Public Works Committees


Upper Salinas-Las Tablas Resource Conservation District

65 S. Main Street, Suite 107
Templeton, CA 93465
Get Directions

Phone (805) 434-0396 x5
Fax (805) 434-0284
info [at]

Contrail FAQs

Videos outlining how to use the County's real-time rain and stream monitoring service at


Upper Salinas-Las Tablas Resource Conservation District

65 S. Main Street, Suite 107
Templeton, CA 93465
Get Directions

Phone (805) 434-0396 x5
Fax (805) 434-0284
info [at]

Cooperative Road Improvement Program

The Cooperative Road Improvement Program was put in place to help local residents upgrade existing unpaved County maintained roads to paved roads or bring roads to a County standard for acceptance into the maintained system.

County Service Areas

A County Service Area (CSA) is a special taxing area which bears a special assessment or service charge for particular types of extended services. Public Works maintains CSAs for Nipomo, Oak Shores, Cayucos, Avila Beach, Shandon, SLO County Club, and Santa Margarita.

CPACS Volunteer Sign Up

CSA 1 - Nipomo Area

These budget units fund some or all of the following services within certain areas of Nipomo: drainage and sewer collection facilities maintenance, street lighting energy charges, and pass-through costs for wastewater disposal services.

CSA 10/10A - Cayucos Area

The CSA 10 water treatment plant provides drinking water to the community of Cayucos. CSA 10A is the water distribution system for the southern part of Cayucos.

CSA 12 - Avila Beach Area

CSA 12 serves water to a large eastern section of Avila Beach and two smaller areas to the north and west of the community.

CSA 16 - Shandon

Provides water service to the Community of Shandon.

CSA 18 - San Luis Obispo Country Club Area

Funds wastewater treatment and disposal for the San Luis Obispo Country Club area

The Public Works Department has completed a number of upgrades at the County Club Wastewater Treatment Plant including: sludge removal from aeration Pond No. 1, relocation of the inlet pipe, and installation of a floating baffle system in Pond No. 1. These improvements will increase circulation and digestion in the aeration pond. Additional improvements to aeration Pond No. 2 will be implemented when adequate funding has been secured.

CSA 23 - Santa Margarita

Funds water service in Santa Margarita

CSA 23 consists of two (2) active groundwater wells and two (2) water storage tanks currently serving to meet the needs of Santa Margarita customers.

CSA 7/7A - Oak Shores

CSA 7/7A encompasses properties on the northern shores of Lake Nacimiento funding wastewater services for the residents of Oak Shores.

Cuyama Valley Groundwater Basin

The Cuyama Valley Groundwater Basin, DWR Bulletin 118 Basin No. 3-13, is situated between the Caliente Range to the north and the Sierra Madre Mountains to the southwest. The valley trends east and is drained by the Cuyama River which is the primary source of recharge to the groundwater basin. The basin overlies an area of approximately 147,200 acres (230 square miles) which extends into four counties, including San Luis Obispo County, Santa Barbara County, Kern County, and Ventura County. The basin area in San Luis Obispo County is approximately 32,600 acres (51 square miles).

Development Fee Appeals

See Development Services Fee Schedule

Development Plan Checking

Review construction documents associated with land development

Disadvantaged Business Enterprise (DBE) Program

The California Department of Transportation, through the Federal Highway Administration (FHWA), requires the County of San Luis Obispo to adopt and execute a Disadvantaged Business Enterprise (DBE) Program for the hiring of disadvantaged businesses for projects receiving Federal-aid funds. Disadvantaged Business Enterprises are defined as those for-profit small businesses where 51% of the business (as defined by the United States Small Business Administration) is owned by one or more socially and economically disadvantaged individuals and whose management and daily business operations are controlled by one or more of the socially and economically disadvantaged individuals who own it.

Drainage and Flood Hazard Review

Building Permit review for potential drainage or flood hazards.

Drainage Studies

These reports summarize findings, conclusions and recommendations of the Drainage and Flood Control Study conducted for seven San Luis Obispo communities.

Drinking Water Source Assessments

These assessments identify the vulnerability of the drinking water supply to contamination from typical human activities, intending to facilitate and provide the basic information for each community to develop a program to protect the drinking water supply.

El Camino Real Bridge Replacement Project, Santa Margarita

The project proposes replacing the existing bridge on El Camino Real over the Santa Margarita Creek with a new cast in place, concrete slab bridge.

Encroachment Permit Payment

Electronic Payments

With an Encroachment or Transportation permit number, payments can now be made electronically through our new payment portal system at any time. By accessing the Citizens Connect Portal, and creating an account, you can then pay for permits online and view permit information. There will no longer be the need to call in permit payments. 

  • Major Credit Cards Only
  • Debit Cards Ok
  • No E-Checks

For help with an electronic payment, please follow the payment guide below.

You can also click here to download a PDF version of this guide.

Encroachment Permits

An Encroachment Permit is a permit which allows people to work within or use the County right of way. An Encroachment Permit is required whenever an activity (e.g. construction, events, etc.) takes place in the County right of way.

Flood Control Zones

Established in 1945, The San Luis Obispo Flood Control and Water Conservation District (SLOFC&WCD or "District") is a resource to help individuals and communities in San Luis Obispo County identify and address flooding problems with the purpose "to provide for control, disposition and distribution of the flood and storm waters of the district and of streams flowing into the district..."

Click the link below to access each Zone's webpage:

Garbage and Recycling Service Contacts

Contact numbers and websites for San Luis Obispo County garbage and recycling service providers.

GIS of Survey Maps

GIS of The County Survey Maps and Corner Records.  Open Map in New Page

Groundwater Well Level Snapshots

This map shows well data that are averaged to give a snapshot of current groundwater level conditions. 

Integrated Regional Water Management (IRWM)

Integrated Regional Water Management (IRWM) is a collaborative effort to manage all aspects of water resources in a region.

  • Crosses jurisdictional, watershed, and political boundaries
  • Involves multiple agencies, stakeholders, individuals, and groups
  • Addresses regional issues and differing perspectives of all the entities involved through mutually beneficial solutions.
  • Develops multi-benefit solutions

Please visit the IRWM Plan Page for more information about the adopted 2019 IRWM Plan.

To stay informed of all things IRWM and RWMG in San Luis Obispo County, please sign-up for our email list here. 


Interactive Bikeway Map

GIS map of all County maintained bridges and plans for proposed bikeway improvements and installations.

Interactive Groundwater Basins Map

Groundwater basins throughout San Luis Obispo County.

Invasive Mussels

Outlines the ongoing Quagga/Zebra mussel programs throughout San Luis Obispo County.

Lake Nacimiento Mussel Inspection Program

Boat inspection program for Lake Nacimiento to prevent the spread of Quagga and Zebra Mussels.

Lake Nacimiento Resident Vessel Program

Additional feature of the Mussel Prevention Program available to participating, eligible private launch ramps at Lake Nacimiento.

Live Water and Weather Data

Live weather and water information including Stream, Rain and Reservoir levels in San Luis Obispo County.

Los Osos Basin Management Committee (BMC)

The Los Osos Basin Management Committee (Los Osos BMC) consist of representatives from the Los Osos Community Services District, Golden State Water Company, S&T Mutual Water Company, and the County of San Luis Obispo. The formation of the Los Osos BMC was part of the court approved Stipulated Judgment in October 2015.  The Los Osos BMC oversees the implementation of the Los Osos Basin Plan in the adjudicated area of the locally define groundwater basin in Los Osos Valley - Los Osos Area Subbasin (DWR Basin 3-8.01). 

Los Osos Low Income Financial Assistance Program

This program provides financial assistance (up to 20% of the annual sewer service charge component) to low income households in the Los Osos community.

Los Osos Sewer Lateral and Septic Tank Locations

Locations for sewer laterals and septic tanks in Los Osos

Los Osos Valley Groundwater Basin

The Los Osos Valley Groundwater Basin, DWR Bulletin 118 Basin No. 3-08, is bounded on the north by Park Ridge, on the south by Irish Hills, on the west by Morro Bay, and on the east by a drainage divide separating Los Osos Valley from San Luis Valley. The Los Osos Basin, as defined by DWR, is located in San Luis Obispo County and covers 6,990 acres (10.9 square miles).

On February 11, 2019, DWR released the 2018 Final Basin Boundary Modifications for Los Osos Valley Groundwater Basin, including the following basin modifications: 

  • DWR approved the creation of two jurisdictional subbasins:
    • Los Osos Area Subbasin (3-08.01)
    • Warden Creek Subbasin (3-08.02)
  • DWR approved the removal of the southern fringe area
  • DWR denied the removal of the minor northern fringe area

Los Osos Wastewater Project

Evaluation and development of a wastewater treatment system for Los Osos, CA.

Los Osos Water Conservation Rebate Program - For Homeowner Installation

To date, Public Works has spent 1.6 million dollars on the water conservation program. The goal of reducing indoor water usage to 50 gallons per day per person has been achieved (current indoor water usage is now 40 gallons per person). 

We continue to find ways to achieve a sustainable groundwater basin. Public Works coordinates groundwater sustainable efforts with the Los Osos Basin Management Committee.

Public Works continues to issue rebates for conserving water for customers in the sewer service area by issuing rebates for water efficient toilets, showerheads, washing machines, hot water recirculation systems, complete gray water systems and laundry only gray water systems.

Please refer to your water purveyor or State for other water saving rebate. Please visit for more information.

If you wish to apply for a rebate for plumber installed fixtures and retrofits please see the Plumber Installation Rebate service.


Los Osos Water Conservation Rebate Program - For Plumber Installation

To date, Public Works has spent 1.6 million dollars on the water conservation program. The goal of reducing indoor water usage to 50 gallons per day per person has been achieved (current indoor water usage is now 40 gallons per person). 

We continue to find ways to achieve a sustainable groundwater basin. Public Works coordinates groundwater sustainable efforts with the Los Osos Basin Management Committee.

Public Works continues to issue rebates for conserving water for customers in the sewer service area by issuing rebates for water efficient toilets, showerheads, washing machines, hot water recirculation systems, complete gray water systems and laundry only gray water systems.

Please refer to your water purveyor or State for other water saving rebate. Please visit for more information.

If you wish to apply for a rebate for homeowner installed fixtures and retrofits please see the Homeowner Installation Rebate service.


Los Osos Water Recycling Facility

Operate and maintain the Los Osos Water Recycling Facility and collection system 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.

The latest news and announcements are provided below.

Los Osos Water Recycling Facility Tours

Schedule a Tour at our Los Osos Water Recycling Facility.

Main Street at Highway 101 Interchange in Templeton

Reconfiguration of the US 101 and Main Street Interchange in the community of Templeton.


County maps available for reference and download.

Master Water Report

The Master Water Report (MWR) is a comprehensive plan evaluating water management strategies - including optimization of existing water supplies - to meet water resource needs County-wide.

Mid-Higuera Bypass Project

The Mid-Higuera Bypass Project is proposed to increase the flood control capacity of the San Luis Obispo Creek between Marsh Street and Madonna Road.

Nacimiento Project Commission

Meeting Calendar - Agendas and Meeting Details



The mission of the Nacimiento Project Commission is to guide the development of the construction and operation of the Nacimiento Water Project (Project) facilities needed for conveyance of water from Lake Nacimiento to water purveyors within the San Luis Obispo County Flood Control and Water Conservation District (District).


Commission membership consists of five seats in total -- four held by the initial Project Participants (City of Paso Robles, Templeton CSD, Atascadero MWC, and City of San Luis Obispo), and one by the District representative.


Regular Commission meetings are held quarterly on the fourth Thursday of selected months at 4:00 p.m. at the Chambers of the Templeton CSD or another agreed-upon location.

As meeting logistics are subject to change, please contact County Public Works at 805-781-5252 for confirmation of date, location & time.


Please follow this link to the Nacimiento Water Project

Nacimiento Water Project

One of the largest value projects the County has ever completed, the Nacimiento Water Project began operations in 2011 after the construction of the $176 million, 45-mile pipeline from Lake Nacimiento to San Luis Obispo was completed. Today County staff oversee the operations and management of the pipeline.

New Probation Department Building

The Board of Supervisors has approved the construction of a New Probation Department Building.  The new building will replace the Probation Department’s main office in San Luis Obispo on Bishop Street, referred to as Casa Loma.   The Casa Loma facility was built in 1940, is in need of constant repair, short on space and ill-suited for today’s Probation Department needs.  The new facility will be a state-of-the-art facility that will meet the Probation Department’s needs for decades to come.

North Coast

North Coast Planning Area contains 5 Watersheds

North County

North County Planning Area contains 11 Watersheds

Oak Shores Wastewater Treatment Facility Upgrade

This project includes improvements to increase system capacity, provide nitrogen removal, increase flow capacity, and upgrade the collection system for the community of Oak Shores.

Oceano Drainage Improvement Project

This project is to construct drainage improvements to alleviate existing drainage issues in the town of Oceano at Highway 1.

Paso Basin Aerial Groundwater Mapping Pilot Study

Our community needs a more complete picture of our groundwater resources so that we can make better decisions about managing water into the future. The County of San Luis Obispo was fortunate enough to be among three agencies selected for a pilot study to collect groundwater data in a portion of the Paso Robles Basin (click for map of study area). This pilot study is using innovative technology that could change the way that California collects information about groundwater basins.

What would normally take the County years to survey will only take a few days thanks to new aerial groundwater mapping technology called Aerial Electromagnetic method (AEM). 

Paso Robles Groundwater Basin

The “Paso Robles Area Subbasin” of the Salinas Valley Groundwater Basin (locally referred to as the “Paso Robles Groundwater Basin” - see DWR Bulletin 118 Basin No. 3-004.06, lies in northern San Luis Obispo County following boundary modifications which removed the portion in Monterey County in early 2019. The subbasin is bounded by the Santa Lucia Range on the west, the La Panza Range on the South, and the Temblor and Diablo Ranges on the east. The basin overlies approximately 436,000 acres (681 square miles).

Pavement Management Report

Since 1997, the Public Works Department has maintained a formal pavement management program for documenting road conditions, forecasting pavement maintenance and scheduling maintenance funds for the road network.

Pay Your Water Bill

Residents of Shandon, Cayucos, and Santa Margarita can pay their water bills online.

COVID-19 Rent Relief

Project Bid Results

Bid results for Public Works projects since 2009.

Projects to be Completed by County Staff

Pursuant to the provisions of Section 22031 of the California Public Contract Code and as authorized by the Board of Supervisors of the County of San Luis Obispo, the Director of Public Works for the County of San Luis Obispo hereby states the intention to use County forces for new road construction and/or reconstruction work regarding the projects listed below. The work performed by County forces relating to the projects listed below shall comply with the following criteria:

  1. The project work is beyond routine maintenance as defined through the State controller's Office.
  2. The total value of the work falls within the budgetary limits established under Section 22031(b)(2) of the Public Contract Code.
  3. The Director of Public Works, or a registered civil engineer acting under his direction, shall prepare, file and maintain all such records and reports as may be required by applicable law regarding any such work performed by County forces.

The foregoing notice is hereby adopted on the 27th day of September, 2019.

For an official signed copy, click here

Public Improvement Standards

The purpose of establishing Public Improvement Standards is to help provide public facilities and services that ensure health and safety and enhance quality of life for the community.

Public Records Request Form

California Public Records Act (CPRA)


Per the California Public Records Act (CPRA), I hereby request reproduction of the following records maintained by the Department of Public Works and understand that there may be fees incurred in the reproduction of the records. Please complete the form below. If the Department of Public Works does not maintain your requested records this form will be forwarded to the correct department.

Public Works GIS

The Public Works Department maintains GIS information for Road Closures, Capital Projects, Los Osos Sewer Laterals, Map Indexes, and Groundwater Basins.

Public Works Public Records Request

Public Works provides access to public records per the California Public Records Act (CPRA). Examples of requests Public Works is best suited to handle would pertain to County roadways, mapping, improvement projects or water data.

Public Works Water Resources

Please visit to learn about the County’s water resources. You'll also find information about flood control, major projects, hydro-logic investigations, data collection, and many other topics.

Record Map Index

Scans of all of the County's recorded maps. These include: Records of Survey, Tract Maps, Parcel Maps, Corner Records, and other miscellaneous maps )

Record Plan Index

Scans of various County engineering plans including: Bridges, curbs, Parcel and Tract Map Improvement Plans, Road Plans, Right of Way Plans, and State Highway Plans.

Regional Water Infrastructure Resiliency Planning

In response to the recent drought and in anticipation of future drought conditions, the Water Resources Division is coordinating with key water agencies throughout the county to develop a balanced action plan for mitigating vulnerabilities and enhancing reliability, resilience, and optimum utilization of existing and future regional water infrastructure. This effort implements State priorities related to countywide drought planning and key recommendations from the Countywide Master Water Report:

  • Lead efforts to optimize the use of unsubscribed and/or underutilized water from the State Water Project and Nacimiento Water Project, in conjunction with other facilities, to promote enhanced use of existing available resources that support local agency use and exchanges (Section
  • Support development of contingency plans (Section 4.8.1)
  • Develop “boiler plate” agreements, streamlined processes for local interagency collaboration and governance structures for future projects and programs (Section 4.8.6)

When complete, specific prioritized actions to address priority vulnerabilities will be identified along with sample agreements to assist with moving forward on those actions.


Technical Report Documents

Road Closures and Delays

Road closures and delays due to ongoing projects, events, or storms.


Road closures and delays are subject to change due to weather.

Road Maintenance Requests

The County of San Luis Obispo Public Works Department is responsible for maintenance and installation of signal lights, road signs, and road striping, in addition to roadway maintenance and improvements. A request should be submitted to report problems and concerns with County maintained signals, signs, striping, and other road maintenance issues including potholes or roadway surface treatment.

Salinas Dam Disposition Study

Salinas Dam (forming Santa Margarita Lake) was built in 1941 under a military directive to supply water to Camp San Luis Obispo to support training needs for the Army during World War II.  Due to this, the dam does not have a Civil Works Authority nor is it authorized for any flood risk management purposes.  Shortly after it was built, Camp San Luis Obispo was no longer an active military facility, and the military transferred ownership to the Army Corps of Engineers (USACE) in 1955.  USACE subsequently leased the facility to the San Luis Obispo County Flood Control and Water Conservation District (District) to operate the dam to provide water supply for the City of San Luis Obispo (City).  The City has existing water rights for 45,000 acre-feet of storage, however current storage capacity is 23,843 acre-feet because the gate in the spillway was not installed as planned during construction due to structural concerns (indicated by arrow).  Transferring ownership and putting in the gate is identified as an opportunity for securing additional water supplies to address needs in San Luis Obispo County in the County-wide Master Water Report.


A USACE Disposition Study has been funded and is being coordinated by the Los Angeles office with the District and the City.  If disposition to the District from the USACE is feasible, local ownership is intended to ensure long-term security of a critical local water supply and facilitate opportunities for additional supply to the Paso Robles Groundwater Basin, designated as in critical overdraft by the State.  It is anticipated that funding partnerships would be sought to help with any costs associated with transferring the dam to local ownership and installing the gates for increased water supply. 

San Luis Obispo Valley Groundwater Basin

The San Luis Obispo Valley Groundwater Basin, DWR Bulletin 118 Basin No. 3-09 is situated in the San Luis and Edna Valleys in central to southwest San Luis Obispo County. A rise in bedrock south of the San Luis Obispo Airport has created two separate subsurface drainage systems or subbasins (i.e., San Luis Valley and Edna Valley). The basin overlies an area of approximately 12,700 acres (19.9 square miles) and is part of the Central Coast Watershed. The Edna Valley Subbasin (approximately 4,700 acres) is entirely within unincorporated San Luis Obispo County, while the San Luis Valley Subbasin (approximately 8,000 acres) includes both unincorporated County and the City of San Luis Obispo.

Santa Maria River Valley Groundwater Basin

The Santa Maria River Valley Groundwater Basin (Santa Maria Basin), DWR Bulletin 118 Basin No. 3-12 , underlies the coastal portion of the northern Santa Barbara and southern San Luis Obispo Counties. The DWR-defined Santa Maria Basin encompasses approximately 184,000 acres (288 square miles), of which approximately 61,220 acres (95.7 square miles) are within San Luis Obispo County. Annual precipitation for the basin ranges from 13 to 17 inches with an average of 15 inches. Groundwater is found in alluvium, dune sands, and the Orcutt, Paso Robles, Pismo, and Careaga Formations of the basin. Groundwater is unconfined throughout most of the basin except in the coastal portion where it is confined.

Sewer and Water Connections (Will Serve)

The County of San Luis Obispo provides water and/or sewer services for specific County Service Areas (CSAs). These services are managed through issuance of water/sewer Will Serve letters.

Email Will Serve inquiries and requests to [email protected]

SLO Watershed

Watershed maps and data for San Luis Obispo County.

Solid Waste Franchise Agreements

Solid waste agreements throughout San Luis Obispo County.

South County

South County Planning Area contains 9 Watersheds

Special Event Permits

If any traffic control, route markers, road/lane closures, pre-event advertising, participant fee, or event activities takes place in County Right-of-Way.

State Route 227 and Los Ranchos Road Intersection Operational Improvements Project

The County of San Luis Obispo is in the preliminary engineering phase of a project to improve operations at the State Route 227 and Los Ranchos Road intersections. In order to determine the best solution at this intersection, the County is working on a detailed traffic analysis of the State Route 227 corridor from Aero Drive to Price Canyon Road.



State Water Project and Subcontractors Advisory Committee

The purpose of the Committee is to monitor, advise, and make recommendations to the District Board (and the respective governing bodies of the Subcontractor agencies) concerning the District’s existing (or related) State Water agreements, or proposed modifications to such agreements.

State Water Project Water Management Tools Study

The San Luis Obispo County Flood Control and Water Conservation District (District) is coordinating with Central Coast Water Authority (CCWA) to conduct a study on the new Water Management Tools that are a part of a new State Water Project (SWP) Contract Amendment.

Please see below for more information.

Stormwater Dry Well or Infiltrator Registration

Dry wells and other sub-surface stormwater infiltration practices/technologies serving uses other than single-family homes are considered Class V wells, subject to US Environmental Protection Agency (US EPA) regulations. Typically, Class V wells are shallow wells used to place a variety of fluids directly below the land surface. By definition, a well is “any bored, drilled, driven shaft, or dug hole that is deeper than its widest surface dimension, or an improved sinkhole, or a subsurface fluid distribution system” and an “injection well” is a “well” into which “fluids” are being injected (40 CFR §144.3).  A guide can be found here: Class V Well Guide.

Stormwater dry wells and other sub-surface stormwater infiltration practices/technologies may be authorized to operate as long as they are registered with the US EPA, and only inject uncontaminated stormwater. The County of San Luis Obispo currently requires Class V Well registration as part of permitting new development.

Stormwater Requirements for New Construction

Development Services Division ensures site plans incorporate the appropriate post-construction stormwater runoff controls. Staff can assist applicants with determining which State requirements apply to their project and provide reference resources for achieving compliance. Applicants are advised to consider post-construction runoff requirements during the site design process.

Stormwater Resource Plan Program

Public agencies are now required to develop a Stormwater Resource Plan (SWRP) (or functional equivalent) as a condition of receiving grant funds from a bond approved after January 2014 for storm water and dry weather runoff capture projects (Water Code section 10563). The State Water Board established guidelines on developing a SWRP:

The intent is to encourage the use of storm water and dry weather runoff as a resource to improve water quality, reduce localized flooding, and increase water supplies for beneficial uses and the environment.

Stormwater Training Resources

Stormwater Training Videos and Informational Quizzes 

Street Sweeping Schedule

Schedules for street sweeping performed monthly on designated County-maintained roads. The street sweeping program encompasses urbanized areas as designated by NPDES MS4 boundaries

Survey Map Review

The County Surveyor's office reviews all Records of Survey and Corner Records filed in the county. We also review Parcel Maps and Tract Maps that are processed by the County.

See our forms section for: checklist, forms, informational documents and other documents pertaining to the survey map review process. 


Sustainable Groundwater Management Act (SGMA)

The “Sustainable Groundwater Management Act” (SGMA) took effect on January 1, 2015. SGMA provides for the preparation and implementation of Groundwater Sustainability Plans (GSP) for High and Medium priority groundwater basins.

Basins with SGMA efforts mapped in San Luis Obispo County, based on the 2019 Final Basin Prioritization by the State Department of Water Resources (DWR):

Learn more about SGMA by visiting the State's website:

NOTE: For information on current groundwater studies, please visit the following links: 

Tefft Street at Highway 101 Interchange

Reconfiguration the US 101 and Tefft Street Interchange to reduce delay on Tefft Street.

Title VI

Title VI of the 1964 Civil Rights Act requires that "No person in the united States shall, on the ground of race, color or national origin, be excluded from participation in, be denied the benefits of, or be subjected to discrimination under any program or activity receiving federal financial assistance." 

Traffic Circulation Studies

Traffic Circulation Studies involve the creation of a new computerized traffic models that would reasonably simulate current traffic flow patterns and also forecast future travel demands and traffic flow patterns.

Traffic Counts

The County of San Luis Obispo Public Works Department maintains traffic count data for all County maintained roads.

Traffic Regulations Code Book

The Traffic Regulations Code Book outlines the provisions and regulations previously contained in Title 15 of the County Code.

Transportation Permits

Request permission to haul, drive, or tow an oversized vehicle on County roads

Wastewater Facility Odor Complaint Form

The County is seeking assistance from citizens in identifying odor-related issues in the community. Please be our noses and report nuisance odors by calling us or filling out this form during (or as soon as possible) the smell is noticed. When speaking with staff, please be prepared to report the following: Name and phone number Date, time and location when the odor was present

Water Conservation

On April 7, 2017 Governor Brown ended the drought state of emergency for most of California and issued Executive Order B-40-17, directing state agencies to update temporary emergency water restrictions and transition to permanent, long-term improvements in water use, making conservation a California way of life.

Water Information Directory

Your one-stop shop to anything water related in San Luis Obispo County and more.  Below, you'll find links to webpages with information about water sources, providers, management efforts and many other topics. We hope you can find what you're looking for!

Water Quality Reports

Details on where your water comes from, what it contains, and how it compares to State standards.

Water Resources Advisory Committee (WRAC)

The WRAC advises the County Board of Supervisors concerning all policy decisions relating to the water resources of the San Luis Obispo County Flood Control and Water Conservation District, and recommends specific water resource and conservation programs.

Adopted Bylaws

At-Large Membership Vision

Application for WRAC Appointment                                                                                              

Please submit completed applications to Brendan Clark via email ([email protected])

Click here to subsribe to the WRAC email notification list!

Watershed Sanitary Surveys

Each survey is compiled to provide information identifying existing and future sources of water contamination, provide a baseline of water quality and watershed conditions, and recommend watershed management practices that will protect raw water quality.


San Luis Obispo County is full of diversity, and the watersheds in our county represent that diversity. Explore the 25 watersheds and find what makes each one unique, and the common factors affecting them all. Discover the flora and fauna that depend on the diverse habitats, some of which can only be found in San Luis Obispo County.

Zone 1/1A - Arroyo Grande Creek Channel

Zone 1/1A committee is responsible for the maintenance and operations of the Arroyo Grande and Los Berros Channels to provide flood protection within the Zone located near the City of Arroyo Grande and the community of Oceano.

Zone 3 - Lopez Water Project

Funds the operations of the Lopez Project which includes Lopez Lake and Dam, Lopez Terminal Reservoir, Lopez Water Treatment Plant and Distribution System. The Project provides drinking water to the Five Cities communities of Arroyo Grande, Avila Beach, Grover Beach, Oceano CSD, and Pismo Beach.

Zone 9 – San Luis Obispo Creek Watershed

Established in 1973, Zone 9 provides flood control services for the area encompassing San Luis Obispo Creek and its tributaries.