Lagoon Notification System

Last Tested:

    • All lagoons – July 6, 2017

What The Colors Mean

The AWLHOA posts the current condition of each lagoon via a simple color-coded system:

    • Low health risk for water contact.
    • Bacteria results are within the State Health Standard Limits.
    • Levels of bacteria are within a normal range.
    • Increased health risk for swimming and wading.
    • Bacteria results do NOT meet the State Health Standards.
    • No swimming, wading or water contact.
    • There is a Water Quality Hazard.

We base our color chart after the East Bay Parks Water Quality Program:

“A green light means that our indicator bacteria test results are below the maximum levels and meet state standards.

A yellow light means that one or more of any of the indicator bacteria at that location is above the daily maximum level and exceeds state standards.

A red light means that the beach is closed due to a water quality emergency.”

In order for us to move a Lagoon into “Green”, the Board and City have determined that the Lagoon in question needs to provide 2 test results in a row that fall below the 400 MPN/100ml threshold.

How To Read The Color Chart

In the top navigation area, look for your lagoon number and identify it’s Water Quality status. For example, if the lagoon status displayed the following:

Lagoon (example only):

It would indicate that Lagoon 2’s water condition was considered unsafe for swimming or wading, Lagoon 4’s water showed higher than normal levels of bacteria posing an increased risk with contact, and that the remaining lagoons were all within normal bacterial range.

How Are Lagoons Numberred

If unsure of lagoon area definitions, please refer the About AWLHOA page for lagoon maps.

Swim At Your Own Risk

Please keep in mind that the color coding is only a Board recommendation. Water quality conditions can change any time and there is always some risk with lagoon water contact. Lagoon water contact may cause illness. Do not swallow water. Shower and towel dry after water contact.


If you have suggestions for how we can improve our website communications regarding the Lagoon water quality or any other areas, we would love to hear your feedback.