FOSR’s Summer E. coli Test Results for Wednesday, June 14, 2023: Water levels remain low

These are the E. coli results for the water samples that were collected yesterday, Wednesday, June 14, 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 remained elevated.

  • FW 36 248.1 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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