FOSR’s Summer E. coli Test Results for Wednesday, June 7, 2023

These are the E. coli results for the water samples that were collected yesterday, Wednesday, June 07, 2023.  The sites located on the Main-stem, North Fork, and South Fork of the Shenandoah River had relatively low E. coli concentrations/levels.  The E. Coli concentrations/levels in Manassas Run however were elevated.

  • FW 36 325.5 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 reference point, 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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