E. coli Monitoring Results through October, 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
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., and is highlighted below in red typeface.  The state standard for drinking water is 0 CFU/100ml.

October’s Data

Back Creek 1  – 1,000
Back Creek 2  –  567
Back Creek 3  –  134
Back Creek 3.8  – 0
Bells Creek  –  67
Eidson Creek 1  – 67
Eidson Creek 2  – 100
Middle River 1  –  134
Middle River 2  –  134
Middle River 3A  –  334
Middle River 3B  –  300
Middle River 4  –  100
Middle River 4B  –  no sample
Middle River 5  – 167
Middle River 6  – 34

Click here to see a list of site locations and a spreadsheet of all data collected  from July, 2015, through October, 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, Pete Cooper, and Joe McCue


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