E. coli results from sampling on Wednesday, July 13, 2022. Of the 13 sites tested, five exceeded the 235 CFU/100 mL . The sites that exceeded were:
- FW36 – Manassas Run, Warren County, VA, above the confluence with Main-stem of Shenandoah River @ Morgan’s Ford public boat landing, E. coli 3972.6 MPN CFU per 100 mL of sample
- FW35 – Main-stem of Shenandoah River, Warren County, VA @ Morgan’s Ford public boat landing, below the confluence with Manassas Run, E. coli 980.4 MPN CFU per 100 mL of sample
- FW14 – South Fork Shenandoah River, Warren County, VA @ Front Royal public boat landing, E. coli 517.2 MPN CFU per 100 mL of sample
- FP03WL – South Fork Shenandoah River, Page County, VA @ White House public boat landing, E. coli 275.5 MPN CFU per 100 mL of sample
- FCOC – Opequon Creek, Clarke/Frederick County, VA off Neill Road, E. coli 821.2 MPN CFU per 100 mL of sample
As a reference point, the FOSR uses the Virginia water-quality standard prior to October 2019 which was a single sample threshold of 235 E. coli colony-forming units per 100 mL of water sample for primary recreational use. Meaning that if a single freshwater grab sample had E. coli levels that exceed 235 CFU per 100mL of water sample then the water was considered unsafe for primary recreational use.
The FOSR is providing these data for you to make an informed decision regarding recreation in the Shenandoah River watershed based on the sites tested.