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Old 06-18-18, 06:15 PM   #1
orey10m
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Default Turbidity questions

Anyone know why the turbidity is reported differently at the two sites I've screenshotted and linked to below?:
https://m.waterdata.usgs.gov

https://www2.usgs.gov/water/southatlantic/ga/bacteria/

Kinda frustrating trying to figure out if it's 'safe' to recreate in (in this case kayak).
Thanks for any help interpreting the two !

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Old 06-18-18, 07:58 PM   #2
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I think you’re looking for the difference between the estimated E. coli and the measured?

I’m pretty sure that the count estimated based on turbidity is based on historical E. coli measurements cross referenced with measured turbidity levels at the time of sampling.

The sampled data was someone actually dipping a sample jar in the water and counting cells.


They’re within 12ish% of each other. Could actually be closer given that there’s a couple days difference between the dates.


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Old 06-18-18, 10:38 PM   #3
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Thanks for taking the time to respond.
Sry i wasnt clear ..I was talking about the difference between the 470/403 (might as well call them the same thing) and the 43 on the graph I'm the second picture.

43 is well below the limit they describe as "safe".

I'm realizing i already know the answer I'm looking for though .."just go off the website with the red and green indications."
I'll do that from now on. Not like I'm going to get something changed with the people that are in charge of this from my whining on this thread haha.


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Old 06-19-18, 10:05 AM   #4
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Turbidity is lack of clarity of the water. E Coli level is the number of "germs" in the water (a standard sample size), germs that typically come from poopoo.

The numbers are not interchangeable, ie, a turbidity of 47 is not the same as an e coli count of 47.

E coli counts usually corresponds to turbidity levels, but it doesn't have to. But, it does correspond enough at these 2 heavily studied locations for there to be a good estimate of e coli based on turbidity, thus the estimate that the website provides, but those estimates and correlations only apply to those locations.

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Old 06-20-18, 06:20 PM   #5
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Thanks, this is a helpful explanation.

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