Cabin John Local Park (Cabin John Creek)
Historical Water Quality
Passed water quality tests 60-95% of the time
This status is based on the latest sample, taken on September 10th, 2025 Friends of Cabin John Creek updates the status of this beach as soon as test results become available. These results were posted to Swim Guide on September 11th, 2025 at 14:50.
Cabin John Local Park (Cabin John Creek) is sampled Bi-Weekly from June 1st to September 15th.
About Cabin John Local Park (Cabin John Creek)
Current Weather
Source Information
Friends of Cabin John Creek has trained volunteers (Creek Keepers) to monitor water quality at several locations in the Cabin John Creek Watershed, a sub-watershed of the Potomac. Monitoring occurs every other week from June through mid-September. Parameters to be monitored include levels of E.Coli, pH, and temperature. The samples are processed by the Anacostia Riverkeeper water quality lab. The primary parameter of concern is E. coli, a fecal coliform. E. coli is measured in terms of the Most Probable Number /100 ml water and high levels are an indicator of fecal contamination by warm-blooded animals like dogs, birds, and mammals. The MD Primary Contact Water Quality Standards are as follows: * E. coli single sample value = 410 MPN/100mL * E. coli geometric mean = 126 MPN/100mL The Cabin John Creek is rated against these values. * PASS indicates the E. coli single sample value is less than or equal to 410 MPN/100mL. * FAIL indicates bacteria counts of over 410 MPN/100mL.
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