
1 
These Regulations may be cited as the Trade Effluents (Prescribed Processes and Substances) Regulations 1992 and shall come into force on 20th March 1992.
2 
Trade effluent which derives from any process which occasions liquid discharges containing trichloroethylene or perchloroethylene in quantities of thirty kilogrammes per year or more shall be special category effluent for the purposes of Chapter III of Part IV of the Water Industry Act 1991.
Michael Heseltine
Secretary of State for the Environment
19th February 1992David Hunt
Secretary of State for Wales
20th February 1992