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FOSR’s Summer E. coli Test Results for Tuesday, August 02, 2022

Of the 14 sites tested on Tuesday, August 02, 2022, one exceeded the 235 E. coli CFU/100 mL threshold for recreational use. The site that exceeded was:

  • FCOC – Opequon Creek, Clarke County, VA,  E. coli 461.1 MPN CFU per 100 mL of sample

https://fosr.org/wp-content/uploads/2022/08/FOSR-2022-Summer-Quantitative-E.-coli-Concentration-Results-through-08.02.2022.pdf

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.

FOSR’s Summer E. coli Test Results for Wednesday, July 20, 2022

Of the 14 sites tested on Wednesday, July 20, 2022, two exceeded the 235 E. coli CFU/100 mL threshold for recreational use. 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 461.1 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 387.3 MPN CFU per 100 mL of sample

https://fosr.org/wp-content/uploads/2022/07/FOSR-2022-Summer-Quantitative-E.-coli-Concentration-Results-through-07.20.2022.pdf

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.

FOSR’s Summer E. coli Test Results for Wednesday, July 13, 2022

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

https://fosr.org/wp-content/uploads/2022/07/FOSR-2022-Summer-Quantitative-E.-coli-Concentration-Results-through-07.13.2022.pdf

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.

FOSR’s Summer E. coli Test Results for Tuesday, July 05, 2022

E. coli results from sampling on Tuesday, July 5, 2022. Of the 13 sites tested, one (FSSP) exceeded the 235 CFU/100 mL FOSR threshold.

http://FOSR’s Summer E. coli Test Results for Tuesday, June 28, 2022

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.

June 22, 2022 Concerning E. coli levels at Site FW 35 Shenandoah River, Morgan’s Ford bridge

The E. coli levels of >2,419.6 MPN of CFUs per 100 mL of water sample at Site FW 35 Shenandoah River, Morgan’s Ford bridge, along the bank of the public boat launch on June 22, 2022 are of concern.  When I was collecting the water sample at this site yesterday there were people of all ages, toddlers to adults, enjoying a summers day in the River.

Finding E. coli bacteria in the water indicates recent fecal contamination and possible presence of other disease-causing microorganisms or pathogens.  As the level of E. coli increases, potential health risk from exposure to pathogenic organisms also increases. Possible health effects:

 

FOSR’s Summer E. coli Test Results for Tuesday, June 14, 2022

Confluence Conundrum

This image depicts what can occur when a tributary carrying elevated E. coli levels flows into a larger body of water.  In this example on May 25, 2022, the E. coli level measured in Manassas Run was 1553.1.  Downstream of the confluence with the Shenandoah River, the E. coli levels remained elevated, 648.8, along the bank.  During the same sample collection visit the E. coli levels measured in the middle of the River was 23.1.

(E. coli results reported as MPN colony forming units per 100mL of water samples)

FOSR is Again Providing You with Current E. coli Data

It is summer again and the Friends of the Shenandoah River is here to provide you with E. coli data courtesy of our VA DEQ Level III water quality testing laboratory.  These data can help you to make an informed decision about potential health risk exposure to pathogens associated with the presence of E. coli in the water when recreating in the River at the specified sites.

 

This is the link to find the first set of E. coli data for Summer 2022.

FOSR 2022 Summer Quantitative E. coli Concentration Results through 05.25.2022

 

WHEN IT’s BROWN, TURN AROUND!

FOSR’s 2021 Summer E. coli Results through 09.02.2021

All but one of the sites tested yesterday had exceedingly high E. coli concentrations.  For many years Virginia had a single sample water-quality standard maximum threshold of 235 E. coli colony forming units (CFUs) per 100 mL of water sample for primary recreational use.   Note: The E. coli result for site FW36, Manassas Run upstream of the confluence with the Shenandoah River at Morgans Ford public boat landing in Warren County Virginia is not being reported because the flooded Shenandoah River water was flowing up into Manassas Run mixing with the waters of Manassas Run.

FOSR 2021 Summer Quantitative E. coli Concentration Results through 09.02.2021

FOSR’s 2021 Summer E. coli Results through 08.25.2021

These are the E. coli results for the water samples that were collected yesterday, Wednesday, August 25, 2021.

FOSR 2021 Summer Quantitative E. coli concentration Results through 08.25.2021

Of the 12 times that FOSR has tested Manassas Run this summer, the E. coli levels exceeded the previous Virginia water-quality standard threshold of 235 E. coli colony forming units per 100 mL of water sample for primary recreational use 10 times (83% of the times tested).

The algal blooms continue in the North Fork of the Shenandoah River at Strasburg Park.  While at the site yesterday the foul odor released by the algae was intense.  Sections of the streambed were 75-80% covered with algae making it look like a carpet of green.   Also, lots of clumps of algae that have broken loose were floating downstream.

The low water levels at several of the sites continue to be a serious concern.

 

 
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