Water Treatment Library West Virginia Water Operator Manual III & IVDesigned for operators taking the voluntary Class III/IV water operator course. Tennessee Introduction to Water TreatmentIntroduction to Water Treatment – Grades 1 & 2 – January 2015 Summary of State Operator Certification ProgramsDetailed look at each state’s Water Operator certification programs. Share this page:Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Pinterest (Opens in new window)Click to print (Opens in new window)Click to email a link to a friend (Opens in new window)