High Conservation Value Sites

Adonis Blue At the River Itchen Water Treatment Works, a mix of woodland, dry grassland and wetland is capable of supporting a wide range of birds, mammals, reptiles and flora.

At Fort Southwick Service Reservoir, the species rich unimpaired calcareous grassland supports a range of birds, mammals, reptiles, flora including orchids and invertebrates, several of which are notable species.

At Nore Hill Service Reservoir, a diverse mix of grassland types potentially supports a number of reptiles and flora.

At Slindon Service Reservoir, the operational site is of low value but the surrounding grassland and woodland supports a variety of species.

At Madehurst Service Reservoir the moderately species rich calcareous grassland is believed to support a number of reptiles and invertebrates. Nearby derelict buildings (not in Portsmouth Water ownership) are believed to support a local bat colony.