E. coli Monitoring Results through May, 2019

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FOMR’s E. coli monitoring program is made possible by the following volunteersJo-el Nelson and Emma Evans at the Shenandoah Valley Governor’s SchoolCourtney 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 bacteria colonies 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 of bacteria colonies is represented as “Colony Forming Units” or CFU.  Since it’s based on a 100ml 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.

May, 2019, Results

Back Creek 1  – 1,000
Back Creek 2  –  734
Back Creek 3  –  1,200 
Back Creek 3.8  – 1,334
Bells Creek  –  1,834
Eidson Creek 1  – 334
Eidson Creek 2  – 734
Middle River 1  –  0
Middle River 2  –  167
Middle River 3A  –  2,400
Middle River 3B  –  967
Middle River 4  –  367
Middle River 4B  –  no sample
Middle River 5  – 334
Middle River 6  – 200

Q:  What is the location of each site listed above, and is there any historical data for these sites?
A:  Yes – Click here for the site locations and the data going all the way back to July, 2015.


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