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COVID-19 Updates: Get the latest public information related to coronavirus disease 2019 (COVID-19) at

The Environmental Health Services (EHS) office is closed to in-person visitation until further notice, however we remain open for business via or by telephone at (805) 781-5544.  Please visit for EHS COVID-19 guidance documents.

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Environmental Health Services

Health Agency | Public Health

Beach Water Quality Monitoring

New Mobile-friendly SurfSafeSLO

Get beach water quality results by calling the Beach Water Quality Status Hotline (805) 788-3411

View Beach Water Quality Results for the Last 30 days


This map viewer is for Reference purposes only and may not reflect current beach water conditions. The County of San Luis Obispo does not assume liability for any damages caused by any errors or omissions in the data. The County of San Luis Obispo makes no warranty of any kind, express or implied, that these data are accurate and reliable, nor does the fact of distribution constitute such a warranty. Independent verification of all data should be obtained by any user thereof. Users assume responsibility to determine the appropriate use of these data.


Last 30 Days of Beach Water Quality Results
Beach Water Quality Operations Dashboard 2017 to Date
SurfSafeSLO Brochure
Contact Us
Beach Water Quality Results 2017 to 2019 PDF

Frequently Asked Questions

How often are ocean water samples taken?

Environmental Health Services takes ocean water samples at nineteen locations along the coast on a weekly basis. Samples are analyzed for three (3) types of indicator bacteria, which at sufficient concentrations indicate the potential presence of microbes that may cause human illness. A ratio of two (2) of the three (3) bacteria types are analyzed as well. The results are compared to standards established by the State. If any of the State standards are not met, a Health Advisory is issued. A Health Advisory warns bathers to avoid water contact activities due to the presence of elevated levels of bacteria. An advisory spans fifty (50) yards north and south of the area where the sample is collected. Beaches are posted with advisory signs and remain posted until sample results indicate that bacteria levels meet State standards.

What is a beach health advisory?

A beach health advisory occurs when a sample fails to meet one or more of the state bacteriological standards due to the presence of elevated levels of bacteria. When this occurs, the San Luis Obispo Environmental Health Services Division advises that you should avoid contacting and ingesting the water until sample results indicate acceptable levels of bacteria.

What is a rain advisory?

A rain advisory occurs during significant rain events where elevated levels of bacteria are expected due to storm water runoff. During this time, the San Luis Obispo Environmental Health Services Division advises the public to avoid water contact for 72 hours following a significant rain event.

When does a beach closure occur?
A beach closure occurs when a specific beach location is closed to all water contact activities due to a higher health risk associated with known hazardous waste spills, such as untreated sewage reaching recreational waters.
How often is the website updated?
This website is updated when weekly sample results become available. This information is also available on our hotline (805) 788-3411.
What are some helpful links?

Below are helpful links related to Beach Water Quality Testing: