Tunitas Beach

Half Moon Bay, California
Managed by The Swim Guide

Photo by John Vonderlin

The publicly accessible Tunitas Creek Beach is a long stretch of beach located in Half Moon Bay, in the western part of San Mateo County. From North to South you have nearly two miles of sand bookended by steep cliffs and tidal pools. This beach is a wonderful location for friends and families who are looking to get away from the hustle and bustle of the Bay area. Indeed, you will have a quieter, more private and different experience by coming here. You can admire the beautiful cliffside scenery all the while relaxing on the unspoiled sandy beach.

Water Quality
  • No data available

  • Current Status
  • This status is based on the latest sample. The Swim Guide updates the status of this beach as soon as test results become available.
For water quality icon legend, click:  
Monitoring Frequency

Tunitas Beach is not sampled

Source Information

San Mateo County conducts weekly sampling at over 43 ocean and fresh water sites throughout the year. Samples are collected on Mondays and analyzed by the San Mateo County Public Health Laboratory for the levels of three indicator bacteria. Results are posted to their website within 48 hours. Swim Guide checks for the latest results daily.

The standards for indicator bacteria are as follows:Single sample maximumTotal Coliform > 10,000 MPN (Most Probable Number) / 100 ml of waterEnterococcus > 104 MPN / 100 mlE.coli > 400 MPN / 100 mlGeometric Mean (5 samples collected over a 30 day period)Total Coliform > 1,000 MPN / 100 ml of waterEnterococcus > 35 MPN / 100 mlE.coli > 200 MPN / 100 mlA beach is marked Green when bacteria levels for a single day and geometric mean are below the standards mentioned.A beach is marked Red when bacteria levels for a single day or the geometric mean are above the standards mentioned. A beach is marked Grey when there is no current or reliable monitoring information available.Please contact Greg Smith of County Environmental Health by email GJSmith@smcgov.org or phone (650) 372-6200 if you are interested in becoming a volunteer to help collect water samples at your favorite beach. If you think you’ve contracted an water related illness please send us a pollution report, see your doctor and contact County Environmental Health Services at (650) 372-6200 to make a report. They will need your name, the dates and areas you were swimming, symptoms and contact information for your or your health care provider.

Water Quality Graph

Tunitas Beach

Half Moon Bay, California
Managed by The Swim Guide

Water Quality
  • No data available
  • Current Status
  • This status is based on the latest sample. The Swim Guide updates the status of this beach as soon as test results become available.
For water quality icon legend, click:  

Photo by John Vonderlin

The publicly accessible Tunitas Creek Beach is a long stretch of beach located in Half Moon Bay, in the western part of San Mateo County. From North to South you have nearly two miles of sand bookended by steep cliffs and tidal pools. This beach is a wonderful location for friends and families who are looking to get away from the hustle and bustle of the Bay area. Indeed, you will have a quieter, more private and different experience by coming here. You can admire the beautiful cliffside scenery all the while relaxing on the unspoiled sandy beach.

Monitoring Frequency

Tunitas Beach is not sampled

Source Information

San Mateo County conducts weekly sampling at over 43 ocean and fresh water sites throughout the year. Samples are collected on Mondays and analyzed by the San Mateo County Public Health Laboratory for the levels of three indicator bacteria. Results are posted to their website within 48 hours. Swim Guide checks for the latest results daily.

The standards for indicator bacteria are as follows:Single sample maximumTotal Coliform > 10,000 MPN (Most Probable Number) / 100 ml of waterEnterococcus > 104 MPN / 100 mlE.coli > 400 MPN / 100 mlGeometric Mean (5 samples collected over a 30 day period)Total Coliform > 1,000 MPN / 100 ml of waterEnterococcus > 35 MPN / 100 mlE.coli > 200 MPN / 100 mlA beach is marked Green when bacteria levels for a single day and geometric mean are below the standards mentioned.A beach is marked Red when bacteria levels for a single day or the geometric mean are above the standards mentioned. A beach is marked Grey when there is no current or reliable monitoring information available.Please contact Greg Smith of County Environmental Health by email GJSmith@smcgov.org or phone (650) 372-6200 if you are interested in becoming a volunteer to help collect water samples at your favorite beach. If you think you’ve contracted an water related illness please send us a pollution report, see your doctor and contact County Environmental Health Services at (650) 372-6200 to make a report. They will need your name, the dates and areas you were swimming, symptoms and contact information for your or your health care provider.

Water Quality Graph

  Beach Location Water Quality
Half Moon Bay, California
Half Moon Bay, California
San Gregorio, California
Half Moon Bay, California
Swim Guide
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Swim Guide shares the best information we have at the moment you ask for it. Always obey signs at the beach or advisories from official government agencies. Stay alert and check for other swimming hazards such as dangerous currents and tides. Please report your pollution concerns so Affiliates can help keep other beach-goers safe.

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