Total Coliform/Fecal Coliform Ratio

Stephen Mamber mamber at synapse.bms.com
Mon Dec 18 09:33:44 EST 1995


In article <drice.25.30CF7109 at drice.ehs.colostate.edu>, drice at drice.ehs.colostate.edu (Doug Rice) says:
>
>In article <4an4hc$88s at nntp3.news.primenet.com> kebab at primenet.com writes:
>>From: kebab at primenet.com
>>Subject: Total Coliform/Fecal Coliform Ratio
>>Date: 13 Dec 1995 11:03:24 -0700
>
>>I have heard the premise that a Total Coliform/Fecal Coliform ratio of
>>4 or less in drinking water, recreational waters etc.,  usually
>>indicates sewage pollution.  
>A ratio of greater than 4 usually indicates some type of human pollution.  
>Below 4 indicates a mixed organic impact.  A ratio of around 1.0 indicates 
>animal feces. 


I think you mean FC/FS for fecal coliform/fecal streptococcus.  
This was based on an observation that animal feces appeared to
contain more FS than FC. Check the older editions of Standard Methods 
as suggested by Rice.

All TC vs FC will tell you is if the coliforms in question are of
fecal origin (i.e., E. coli) or of environmental origin (i.e., 
Klebsiella or Enterobacter).  There's no 'ratio' involved here.

SWM

mamber at synapse.bms.com



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