Can be caused by a variety of means, e.g. farm pollution from animal wastes and silage liquor (liquors from green leaf cattle food which has had molasses added to promote fermentation and preservation; they are highly polluting and can be a seasonal cause of fish deaths in small streams), leachate from landfill sites, and spoil heaps, solvent discharge to sewers or to land and inadequate sewage treatment works.
Scope note is not available.