Historical Water Quality
Passed water quality tests at least 95% of the time
This status is based on the latest sample, taken on September 22nd, 2025 Swim Guide - Main updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on September 24th, 2025 at 14:37.
Main Beach @ San Lorenzo River is sampled Weekly from January 1st to December 31st.
About Main Beach @ San Lorenzo River
Current Weather
Source Information
Santa Cruz County’s department of Environmental Health Services provides recreational water quality to the public through their website and by calling 831-454-3188. Samples are collected and tested for the levels of 3 types of bacteria. Please refer to the monitoring frequency in the beach description as frequencies vary throughout the year. Swim Guide checks daily for the latest results. Country standards for indicator bacteria are as follows: Total Coliform > 10,000 MPN (Most Probable Number) / 100 ml of water E.coli > 400 MPN / 100 ml Enterocococcus > 104 MPN / 100 ml A beach will be marked Green when all three levels of bacteria are below standards A beach will be marked Red when 1 of the bacteria levels are above the standard A beach will be marked Grey when there is no current or reliable information. The county advises that you avoid swimming in areas at risk to storm water runoff for at least 3 days after heavy rain.
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