Table Wq06: Water quality designations

Table Wq06. Water quality designations based on invertebrate insect population data for Missouri streams as used by Duchrow (1977).
Seasonal Annual
Water Quality Designation Species Diversity Index Value1 # of Mayfly & Stonefly Taxa Species Diversity Index Value1 # of Mayfly & Stonefly Taxa Total Taxa
Unpolluted >3.9 >9 >6.9 >21 >56
Moderately Polluted 2.2-3.9 5-9 3.8-6.9 10-21 31-56
Polluted <2.2 <5 <3.8 <10 <31

1Species Diversity Index Value=D= (s-1)/(logeN); where "s" equals the number of taxa and "N" is the total number of organisms in the sample.

Key Messages: 

Conservation pays by enriching our economy and quality of life.

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