Sites of Special Scientific Interest (SSSIs) are designated under the Wildlife & Countryside Act 1981 (WCA). In Wales, Natural Resources Wales (NRW) are responsible for identifying these important areas. Sites of Special Scientific Interest (SSSIs) can be designated on land in private ownership as well as on land owned by public bodies and conservation charities. Protection of the Sites of Special Scientific Interest (SSSIs) is achieved by prohibiting damaging operations, unless permission has been granted by Natural Resources Wales (NRW). Natural Resources Wales (NRW) are responsible for the condition of all Sites of Special Scientific Interest (SSSIs) in Wales. See their website here for more information.
The Countryside and Rights of Way Act (CRoW) 2000 made some important amendments to the Wildlife & Countryside Act 1981 and to the way Sites of Special Scientific Interest (SSSIs) are protected.
Development of land around or adjacent to Sites of Special Scientific Interest (SSSIs) can affect the quality of the Sites of Special Scientific Interest (SSSIs). This is particularly true with regard to drainage and rivers or streams that are Sites of Special Scientific Interest (SSSIs).
Natural Resources Wales (NRW) should be consulted before even considering development on or adjacent to a Sites of Special Scientific Interest (SSSIs).