Pollution Tolerance Index Calculator: Northern Kentucky University, Greater Cincinnati Region

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Intolerant	Moderately Tolerant	Fairly Tolerant
Stonefly Nymph Mayfly Nymph Caddisfly Larvae Dobsonfly Larvae Riffle Beetle Water Penny Right-handed Snail	Damselfly Nymph Dragonfly Nymphs Sowbug Scud Crane Fly Larvae Clams Mussels	Midges Black Fly Larvae Leech Planaria
# of taxa	# of taxa	# of taxa

Weighting Factors:


Cumulative Index Value:

22 or more	Excellent
16-21	Good
11-15	Fair
10 or less	Poor