FOSR’s Summer E. coli Test Results for Tuesday, July 18, 2023
These are the E. coli results for the water samples that were collected yesterday, Tuesday, July 18, 2023. The sites located on the Main-stem, North Fork, and South Fork of the Shenandoah River had relatively low levels of E. coli, while the E. Coli levels in Manassas Run however remain elevated.
- FW 36 – 435.2 MPN E. coli Manassas Run, upstream of the confluence with the Shenandoah River at Morgan Ford low water bridge in Warren County, VA
As a benchmark, the FOSR uses the single sample concentration threshold of 235 E. coli colony-forming units per 100 mL of water sample for primary recreational use that was included in the Virginia water-quality standard prior to October 2019. Meaning that if a single freshwater grab sample had E. coli concentration/levels that exceed 235 CFU per 100mL of water sample then the water was considered unsafe for primary recreational use. These data represent a snapshot of the water quality on the date, time, and under the conditions that the water sample was collected.
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