California Water Distribution Operator Exam, Water Quality and Water Sources: all 25 questions
All questions from the Water Quality and Water Sources section for California Water Distribution Operator Exam, each with the correct answer.
- 6001What are pathogenic organisms?
- 6002Why are coliform bacteria tested for in drinking water?
- 6003A positive E. coli result in a drinking water sample indicates what?
- 6004What does a presumptive coliform test result tell you?
- 6005Why do bacteriological sample bottles contain sodium thiosulfate?
- 6006Which sampling technique helps avoid contaminating a coliform sample?
- 6007What is the maximum holding time for a total coliform sample before analysis?
- 6008What does a heterotrophic plate count (HPC) indicate?
- 6009High turbidity in a distribution system is most likely caused by what?
- 6010What is the normal pH range of drinking water in the secondary standards?
- 6011What effect does a low pH have on distribution pipes?
- 6012What is a common effect of very hard water in a distribution system?
- 6013What health risk is associated with high nitrate in drinking water?
- 6014What does the term conductivity measure?
- 6015What is the hydrologic cycle?
- 6016What is the static water level in a well?
- 6017What is the cone of depression around a pumping well?
- 6018Which of these is a potential groundwater contamination source near a well?
- 6019What is a sanitary survey?
- 6020Why are Giardia and Cryptosporidium difficult to control with chlorine alone?
- 6021Which disease is caused by a waterborne protozoan?
- 6022A customer reports a rotten-egg odor from the hot water tap only. What is a likely cause?
- 6023Which customer complaint is most often caused by iron corrosion products stirred up by a flow change?
- 6024What is the purpose of unidirectional flushing?
- 6025Under 22 CCR 64575, what is the minimum flushing velocity that must be maintained in a main?