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