Blagdon Lake is designated a Site of Special Scientific Interest (SSSI) of , created in 1971, largely because of the variety of species and habitats. The area around the pumping station was laid out as an ornamental woodland which includes Scots pine, Cedar, Larch, Spruce, Oak, Beech, Chestnut, Willow, Lime, Holly and Maple. A variety of orchids including green-winged orchid (Anacamptis morio) and southern marsh-orchids can be seen on the borders of the lake.
