water pollution. contamination of water resources by harmful wastes; see also sewerage sewerage,system for the removal and disposal of chiefly liquid wastes and of rainwater, which are collectively called sewage. The average person in the industrialized world produces between 60 and 140 gallons of sewage per day......ater pollution. contamination of water resources by harmful wastes; see also sewerage sewerage,system for the removal and disposal of chiefly liquid wastes and of rainwater, which are collectively called sewage. The average person in the industrialized world produces between 60 and 140 gallons of sewage per day......