Water Distribution Chapter 1 COMPREHENSIVE QUESTIONS AND VERIFIED ANSWERS 2025

Chlorination is the most common means of disinfection used today to protect the public's health - Correct Ans-True As water mains and reservoirs become older, they require less and less maintenance. - Correct Ans-False Routine water quality monitoring of distribution systems consists of collecting samples at remote locations in the system and testing for chlorine residual and coli forms - Correct Ans-True Existing contaminant limits mar be modified is EPA's ongoing research reveals new information about the effects of a particular substance - Correct Ans-True Reservoirs that are not heavily used can be a source of taste, odor, and contamination problems - Correct Ans-True When someone contacts you complaining that their drinking water looks muddy, taste bad, or smells bad, you need not be concerned. - Correct Ans-False The lack of circulation in a dead end creates nearly ideal conditions for degrading water quality - Correct Ans-True Ground waters are more susceptible to contamination than surface waters. - Correct Ans-False A water supply that us satisfactory in quality for one purpose might be entirely unsatisfactory for another - Correct Ans-True Chloramines are considered a more powerful disinfectant than chlorine. - Correct Ans False Under what conditions may water mains be located adjacent to sewer lines? - Correct Ans-When physical conditions or soil conditions prevent minimum separation distances from being met How can corrosion be prevented on the insides of cement or metal pipes? - Correct Ans-Line with asphalt or coal tar coatings WATER WATER What influences the knowledge and skills required to work as a water distribution system operator in a given system? - Correct Ans-The size and type of water distribution system What are organics? - Correct Ans-Chemical substances that are based on the element carbon Why are chloramines more effective against biofilms than chlorine? - Correct Ans-More persistent Why have drinking water quality standards been prepared and used? - Correct Ans-Tp provide the needed quality control and ensure the acceptability of the product Why is water quality monitoring of distribution systems important? - Correct Ans-to identify when and where water quality changes occur in the system. When water lines are being repaired, how can possible contamination of the water line be prevented? - Correct Ans-Keep the hole dewatered What are pathogens? - Correct Ans-disease causing organisms What is the primary responsibility of a water treatment plant? - Correct Ans-to produce a safe and palatable water What is considered the greatest water quality nuisance? - Correct Ans-Corrosion and precipitation of iron What types of consumer complaints can result from hydrant testing and flushing programs? - Correct Ans-Dirty water complaints What is the purpose of adequate and reliable records? - Correct Ans-To document the effectiveness of the operation What is every operators responsibility with regard to safety? - Correct Ans-Be sure that the facilities are a safe place to work and that everyone follows safe procedures What should you do after investigating a drinking water complaint? - Correct Ans-Notify the person who complained of the results and what corrective action was or will be taken What is the term for the treated water storage facilities at water treatment plants? - Correct Ans-Clear wells What does the term water quality describe? - Correct Ans-The composite chemical, physical, and biological characteristics of a water supply WATER WATER What is one of the best results from a well-guided tour of water system facilities? - Correct Ans-Gaining support to obtain the funds necessary to run a good operation What conditions in water main dead ends can produce carbon dioxide, methane, and sulfide odors? - Correct Ans-Anaerobic What is backsiphonage? - Correct Ans-a form of backflow caused by a negative or below atmospheric pressure within the water supply piping What could be the cause of milky water? - Correct Ans-Air Who are a water supply systems ultimate consumers? - Correct Ans-Homes Industrial water users Businesses Why may ground water require treatment? - Correct Ans-To remove excessive hardness to remove iron and manganese to remove taste and odor causing substances What are possible causes of water quality degradation in water storage facilities? - Correct Ans-1.Contamination entering through improperly maintained covers 2.Small animals that gain access through improperly screened overflows 3.Inadequate disinfection of reservoirs after construction or repairs 4.Failure in the side walls of below ground reservoirs 5.Materials introduced to uncovered reservoirs How may large variations in flow through a distribution system adversely affect water quality ? - Correct Ans-1.Low circulation and stagnant water can result in the growth of organisms, formation of sediments and corrosion products, depletion of oxygen, and increased taste and odors 2.Turbulence can entrain air into the supply causing milky water, which is objectionable to consumers 3. Changes in water velocity and flow reversals can result in sediments being stirred up and carried along until they reach the consumer Which items are typical duties of a water distribution system operator? - Correct Ans 1.Lay, connect, test, and disinfect water mains 2.Tap into water mains and clean water mains ate trenches and install shoring barricades , signs, and traffic cones around work sites to protect operators and the public Which diseases are transmitted by internal parasites in water? - Correct Ans Cryptosporidiosis WATER WATER Giardiasis Which types of constituents have limits under primary drinking water standards? - Correct Ans-inorganic chemicals organic chemicals microorganisms disinfection byproducts Which factors may cause water quality degradation - Correct Ans-Dead ends biological growth and activity time in the system cross connections corrosion Which supervision and administration tasks might be included in a water distribution system operators duties? - Correct Ans-Giving advice on future planning keeping adequate reliable records giving advice on budget requirements training new operators encouraging operators to strive for higher levels of certification Which activities are potential safety hazards for water distribution system operators? - Correct Ans-Painting facilities without adequate ventilation excavating for the installation or repairs of pipes working in traffic What are some components of a water distribution system? - Correct Ans-S