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 Reasons New Managers and Supervisors Fail: The Peter Principle March 6, 2015 How to Study for Water Treatment License Exams – Part 5 of 10 October 1, 2018 Texas Water License Exam Prep 2 of 2 February 19, 2019 Post author: Post published:January 28, 2017 Post category:Certification Exams / Distribution / Wastewater Treatment