Matching Pairs Water Pollution VocabularyOnline version Matching vocabulary. by Anna Rowe 1 Toxic Pollution 2 Nutrient Pollution 3 Sediment Pollution 4 Water Pollution 5 Bacterial Pollution The introduction of harmful substances into the water. the presence of excess nutrients in the water. the presence of harmful bacteria in water supplies. the presence of toxic substances in water. the presence of excessive sediments such as silt and clay in water.