Water Quality A bacterium, virus, or other microorganism that can cause disease. Tags: Certification Exam Prep, Distribution System, Pathogen, Water Quality, Water Treatment Read more articles Previous PostLime Softening Next PostWater Main Installation You Might Also Like Water Treatment and Distribution System January 15, 2017 Distribution Piping January 15, 2017 Volume Problem – Wastewater Math December 1, 2016 Post author: Post published:January 28, 2017 Post category:Certification Exams / Distribution / Wastewater Treatment