CLASS D WASTEWATER TEST COMPLETE EXAM STUDY GUIDE WITH PRACTICE QUESTIONS AND VERIFIED ANSWERS 2025–2026

CLASS D WASTEWATER TEST COMPLETE EXAM STUDY GUIDE
WITH PRACTICE QUESTIONS AND VERIFIED ANSWERS 2025–
2026
Operator treatment goals are defined by the limits and conditions in waste discharge - correct
answer -Permits



According to TCEQ design criteria for domestic wastewater system (30 Texas administrative code
chapter 217) wastewater collection lines should not be installed any closer than (9) feet from an
(blank) line - correct answer -Water



Screenings from a treatment plant should be - correct answer -Buried in a permitted sanitary
landfill



(Blank) is considered to be preliminary treatment - correct answer -Grit removal



Settling of solids occurs more rapidly in - correct answer -Warm wastewater



Climate related conditions which affect stabilization pond operations include - correct answer -
Both B and C / Temperature and Prevailing Winds



Treatment processes in facultative pond are - correct answer -Both aerobic and anaerobic



The purpose of a wastewater treatment pond is to stabilize organic materials in sewage by
natural process - correct answer -True



Fixed film treatment processes include - correct answer -Both C and D Trickling Filter and RBC