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 SofteningNext PostWater Main Installation You Might Also Like How to Study for Water Treatment License Exams – Part 4 of 10 September 24, 2018 Calculating Cubic Yards Removed – Distribution Systems November 17, 2016 How To Get Your Texas Class D Water Operator License June 13, 2018 Post author:jay@americanwatercollege.org Post published:January 28, 2017 Post category:Certification Exams / Distribution / Wastewater Treatment