What's Under That Rock?

Determining Water Quality

HVA's in-stream, hands-on macroinvertebrate (aquatic insects) collection program brings volunteers into rivers and streams to find the bizarre creatures dwelling beneath the surface of the river.HVA's in-stream, hands-on macroinvertebrate (aquatic insects) collection program

The number and diversity of these insects are an indicator of water quality. Since they are very sensitive to stress their presence (or absence) can help identify pollution from point sources or polluted runoff.

Volunteers learn to identify the insects by name and determine whether the river's water quality is good or poor quality based on the type of macroinvertebrates found.

Caddisfly

Stonefly

Mayfly