If your business operates a cooling tower or evaporative condenser you are legally required to register it with the council. In the event of a legionella outbreak the council and other agencies can use this information to try to locate the source. The registration is free of charge and you don’t need to renew it unless the details change. The application form can be found here.
As this register is a common subject of Freedom of Information requests a redacted version (with personal information removed) is published here.