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