Many of the wild animals and plants of the Kennet and its banks are increasingly scarce in today's intensively managed countryside. Fortunately, much of the Upper Kennet is designated as a SSSI. The white drifts of stream water crowfoot in early summer are characteristic of chalk and limestone rivers. Species like water vole, reed bunting and brook lamprey are in decline in other parts of the country.

It is important to report any sightings of invasive non-native species which can upset the natural balance of the river.