E. coli Monitoring Results through February, 2019

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FOMR’s E. coli monitoring program is made possible by the following volunteers

Jo-el Nelson and Emma Evans at the 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.

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., and is highlighted below in red typeface.  The state standard for drinking water is 0 CFU/100ml.

February, 2019, Results

Back Creek 1  – 667
Back Creek 2  –  167
Back Creek 3  –  334
Back Creek 3.8  – 734
Bells Creek  –  200
Eidson Creek 1  – 67
Eidson Creek 2  – 0
Middle River 1  –  0
Middle River 2  –  67
Middle River 3A  –  334
Middle River 3B  –  300
Middle River 4  –  600
Middle River 4B  –  no sample
Middle River 5  – 1,000
Middle River 6  – 767

Click here to see a list of where each site above is located and a spreadsheet of all results from July, 2015, through February, 2019.

 


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