... polluters and administrators. Standards and regulations should be tailored to match the level of economic and administrative capacity and capability. Standards should be gradually tightened as progress ... data available on Nigeria's own water quality. The standards considered included those of Australia, Brazil, Canada, India, Tanzania, the United States and the World Health Organization ... substances on aquatic organisms often need to be carried out, in addition to a general search and analysis of published literature. In Canada, for example, the average cost of developing a criterion...