E. coli Monitoring Results through August, 2018

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FOMR graciously acknowledges that the 2018 E. coli  project is possible through the generosity of a grant from the Shenandoah Valley Pure Water Forum

Here’s how FOMR measures E. coli using the Coliscan process:
1.  take a water sample from the River or stream
2.  mix 3 milliliters (ml) of the water sample with Coliscan
3.  pour the mixture into a special Petri dish
4.  incubate the Petri dish for 24 hours to allow the bacteria to grow
5. 
read the number of bacteria colonies that have grown in the Petri dish
6.  take the number of colonies counted in the 3 ml mixture and multiply by 33.33 to get the number of colonies that would be in a 100ml water sample

The resulting number is called “Colony Forming Units” or CFU, and since it’s from 100ml of water sample, it’s called “# CFU/100ml”.  The current Virginia standard for recreational use is 235 CFU/100ml.  Any number greater than that is not safe for swimming, etc.  The state standard for drinking water is 0 CFU/100ml.

August’s Data

Back Creek 1  – no sample
Back Creek 2  –  667
Back Creek 3  –  200
Back Creek 3.8  – 667
Bells Creek  –  2,867
Eidson Creek 1  – 500
Eidson Creek 2  – 900
Middle River 1  –  200
Middle River 2  –  1967
Middle River 3A  –  934
Middle River 3B  –  467
Middle River 4  –  634
Middle River 4B  –  no sample
Middle River 5  – 667
Middle River 6  – 300

Click here to see a list of site locations and a spreadsheet of all data collected  from July, 2015, through August, 2018.

FOMR acknowledges the following volunteers who make this possible:  

Jo-el Nelson & Louisa Esteban at Shenandoah Valley Governor’s School

Courtney Hallacher and her students at Riverheads High School

FOMR volunteers Mike Harmon, Justin Fischbach, Joe Thompson, Bobby Whitescarver, and Joe McCue


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