| Water Quality Designation | Seasonal | Annual | Total Taxa | ||
|---|---|---|---|---|---|
| Species Diversity Index Value1 | # of Mayfly & Stonefly Taxa | Species Diversity Index Value1 | # of Mayfly & Stonefly 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.
