4.—(1) A hazardous substance is any substance or group of substances that are toxic, persistent and liable to bio-accumulate.
(2) This includes in particular the following when they are toxic, persistent and liable to bio-accumulate—
(a)organohalogen compounds and substances which may form such compounds in the aquatic environment,
(b)organophosphorous compounds,
(c)organotin compounds,
(d)substances and preparations, or the breakdown products of such, which have been proved to possess carcinogenic or mutagenic properties or properties which may affect steroidogenic, thyroid, reproduction or other endocrine-related functions in or via the aquatic environment,
(e)persistent hydrocarbons and persistent and bioaccumulable organic toxic substances,
(f)cyanides,
(g)metals (in particular, cadmium and mercury) and their compounds,
(h)arsenic and its compounds,
(i)biocides and plant protection products.
(3) The regulator must publish a list of substances that it considers to be hazardous substances.