Illinois Class D Water License Practice Exam

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• Which type of material is specifically prohibited as backfill for water mains?
• What is the gallon equivalent of 2.20 MGD?
• Is the cost of producing 1000 gallons of water for the public supply considered high compared to the national average?
• How do you determine the needed dose of a chemical for water treatment?
• How many gallons are equivalent to 0.019 MGD?
• Which of the following is a method of determining water safety?
• Which method helps to ensure accurate sample collection in a bacteria testing scenario?
• Which condition necessitates a boil order?
• A distribution system that is "looped" instead of having dead ends will help prevent:
• What is a common consequence of lead pipes in a water system?
• What is the role of coagulation in water treatment?
• Why is it important to have a check valve in a water system?
• After replacing the packing in a lineshaft well's motor, what should the operator expect to see?
• What is the purpose of an air-release vacuum breaker valve?
• What type of system typically uses SCADA technology?
• The number of bacteria samples collected in a public water supply distribution system is based on what criterion?
• What are the three main components of water treatment?
• What percentage of water sold is accounted for if 600,000 gallons are unaccounted for from 4,500,000 gallons purchased?
• What does total chlorine refer to in water treatment?
• What is a water hammer?
• How much pressure (in psi) does 1 foot of elevation provide?
• What is the typical range for pH in a well-balanced water supply?
• What is the minimum free chlorine residual required in all parts of a distribution system?
• How much hands-on experience is required for a Class D test applicant without approved training credits?
• What does a decrease in chlorine residual over time indicate?
• Is a construction permit from the IEPA required for the installation of a water service?
• What is the function of a valve pump blowoff?
• What is the definition of a water main?
• What is the function of a backflow preventer?
• What is a connection between a possible water supply and a non-potable water supply called?
• What is meant by static water level?
• What water source requires disinfection before it is safe to drink?
• Which of the following methods is effective for removing heavy metals from water?
• How is chlorine typically applied in a water treatment facility?
• Why must the IEPA regional office be notified upon issuing a boil order?
• How can performing a water audit benefit a public water supply?
• How does pressure change with elevation in a water system?
• How often should bacteriological samples be collected from a water system?
• Which chemical is known for its high concentration of available chlorine in water treatment?
• In what situation is it necessary to ensure no chlorine residual is present before analysis?
• What occurs when a pump stops and a check valve is present?
• What is the primary purpose of a cross-connection control program?
• What does a sounding tube allow an operator to do?
• What problem can high water hardness cause in plumbing systems?
• Which of the following is crucial to prevent errors in a water quality sample?
• What is the first step in the water treatment process?
• Which method is most effective for thawing a meter located in a meter pit during winter?
• How long should water be collected after the Fossett has run to adequately flush out the service line?
• Which health issue is most directly tied to the presence of cholera in drinking water?
• How often should a water system conduct a comprehensive risk assessment?
• What is the process of sedimentation?
• What is the recommended maximum level of fluoride in drinking water?
• Chlorine tablets (calcium hypochlorite) should be used for the disinfection of newly installed water main. These tablets should be ________________.
• If a home has a water pressure higher than 80 psi, what device should be installed?
• What is the average system pressure in psi at homes 102 feet lower than a water tower situated 144 feet above the base?
• When considering the impact of altitude valves, what is the outcome when pressure in the distribution system drops?
• In what situation is a backflow preventer absolutely essential?
• Why is it important to maintain accurate records in water treatment?
• What does an increase in TDS indicate about water quality?
• What defines free chlorine in a water treatment context?
• What is activated carbon primarily used for in water treatment?
• What is the definition of potable water?
• How does an air line water level measuring device work?
• What is the most common method for testing chlorine residuals in small systems?
• Where can testing for Total Trihalomethanes (THMs) be conducted?
• What is one way to improve a public water supply's financial status?
• When is membrane filtration particularly effective?
• What is the main goal of disinfection in water treatment?
• What is the MGD equivalent of 678,000 gallons?
• How many gallons of water are in a cubic foot of water?
• What is the primary purpose of chlorination in water treatment?
• What can happen if drinking water has high levels of lead?
• If the water level in Tower 1 is 118 feet, what will the pressure reading be at the base?
• What is the minimum flow velocity that a hydrant should be flushed to adequately flush the line?
• What is the significance of conducting a vulnerability assessment?
• Which of the following amounts indicates a significant unaccounted water loss in a public system?
• What is the purpose of a water conservation program?
• What issue can arise from low oxygen levels in waterways?
• What is the function of a circuit breaker in an electrical system?
• Velocity of flow in a water main is typically expressed in what unit?
• What do sampling taps permit?
• What is a common source of chlorine demand in water sources?
• What is the purpose of adding sodium thiosulfate to a bacteria sample bottle?
• Which chemical is commonly used for disinfection in water treatment?
• When should a chlorine residual be tested within a distribution system?
• What physiological condition can result from high levels of nitrates?
• What should be located between the water main and the house if a meter is located in the basement?
• What is typically not a key component of water distribution systems?
• Nitrate levels above what concentration (mg/L) can result in "blue baby" disease?
• Which test is commonly used for determining fluoride levels in water?
• What does an annual water quality report provide?
• What is the best method for thawing a frozen copper service line in winter?
• Over time, a 5/8" x 3/4" water meter is expected to do what in relation to measuring water used?
• What is the impact of high turbidity levels in water?
• What is the purpose of a well casting vent?
• How many million gallons per day (MGD) is equal to 9,500 gallons?
• What is one method used to neutralize acidic water?
• What is the significance of water hardness?
• How can an operator correct the problem of an airlocked pump housing?
• What is the most common type of chlorine used in water treatment?
• What is the implication of low dissolved oxygen levels in water?
• In a 30 day period, how many gallons of unaccounted for water are there if a supply purchases 4,500,000 gallons and sells 3,900,000 gallons?
• High levels of lead in potable water may cause which of the following health issues?
• Cathodic protection in a storage tank is?
• What is the first item used when installing a service line to a customer?
• Why must a dry barrel hydrant be completely opened when operating?
• Are all water towers, standpipes, and vessels that store potable water required to be airtight?
• If an operator measures a total chlorine residual of 1.6 mg/L and a free chlorine residual of 0.9 mg/L, what is the chlorine demand?
• Which process is commonly used to disinfect water in treatment facilities?
• Bacteria samples show the absence or presence of coliform. If present, what do the samples contain?
• How can sediment from the treatment process affect water quality?
• What is the effect of organic matter in water supplies?
• What is the maximum contaminant level for THMs?
• For how long should a boil order typically remain in effect?
• In the context of chlorine analysis, what is typically measured to assess water quality?
• What does the abbreviation 'MCL' stand for?
• The longer the contact time between water and chlorine residuals, the ________ the THM level is likely to be?
• What is the minimum sampling frequency for volatile organic compounds (VOCs)?
• What is a Ranney well?
• Why should THMs be eliminated from finished water?
• What is the role of a water operator in public health?
• What could high levels of nitrates in drinking water indicate?
• What method is used to measure the turbidity of water?
• What type of filtration is primarily used to remove small particles from water?
• What is a common effect of chlorine being in excess of water treatment needs?
• What is the purpose of disinfection in water treatment?
• Which chemical is primarily used for disinfection in water treatments?
• Which water treatment process is primarily used for the removal of microorganisms?
• What is the minimum chlorine residual required in a distribution system?
• What is the percentage of available chlorine in chlorine gas?
• Which tower will register the most pressure when both are full?
• What is the total gallon conversion for 0.999 MGD?
• What is one purpose of an air gap in plumbing systems?
• What type of valve is commonly used to isolate part of a water distribution system?
• How do you determine the finish water quality?
• What is the minimum size of a water main required by the IEPA?
• What does the presence of air bubbles in a water pump's output suggest?
• What is a common issue that can be discovered during a water audit?
• In what scenario would a boil order not be necessary?
• What is the consequence of failing to properly treat water for disinfection?
• Is a construction permit from the IEPA required for the installation of a water main?
• What practice can contribute to the sustainability of water resources?
• What is the purpose of coagulation in water treatment?
• What can excessive heat from a pump indicate?
• How often must a Class D water operator inspect well pumping equipment?
• Why is it important to manage a public water supply system effectively?
• Why is the monitoring of coliform bacteria important in water quality?
• If the pH of a water sample is below seven units, how is it classified?
• What is a common indicator of water contamination?
• What is the invert of a pipe?
• What hazard occurs if calcium hypochlorite comes into contact with oily rags?
• Which device is commonly used to repair a cracked water main?
• What should be installed at the end of a 6 inch PVC water main?
• What is the primary risk associated with untreated surface water?
• What happens if the lid of the bacteria sample bottle is not secured correctly?
• What is the percentage of available chlorine in calcium hypochlorite?
• Which of the following is used to measure water levels accurately?
• How many million gallons per day (MGD) is equivalent to 98,000 gallons?
• How can sedimentation basins optimize the water treatment process?
• What legislation regulates drinking water quality standards?
• Which of the following is NOT a waterborne disease?
• Pump cavitation is most likely to occur when the water source level is where?
• What are lead and copper rule requirements intended to protect against?
• What does 1,245,000 gallons convert to in million gallons per day (MGD)?
• What is the purpose of chloramines as a disinfectant?
• What is the function of an altitude valve?
• Which type of water main is most susceptible to contamination from gasoline-saturated soil?
• When should a new water main be disinfected?
• What does a pump pedestal do?
• Which of the following statements about THM sampling is correct?
• What is the function of a gravel tube?
• What is a check valve mainly used for in a water system?
• What is the primary reason for maintaining lubrication in a pump motor?
• What does SCADA stand for in water system management?
• What is a key consideration when designing a potable water storage system?
• Why must a boil order be issued when system pressure drops below a specified level?
• What is the purpose of regular maintenance on pumps?
• What type of hydrants are commonly used in dry climates?
• When should grease be added to a pump motor?
• What does OSHA stand for?
• Why are pressure tanks used in water systems?
• What is the minimum combined chlorine residual required in all parts of a distribution system?
• What is the primary concern regarding high nitrate levels in water systems?
• What should not be used to mark the location of valves?
• How many gallons per day does 0.895 MGD convert to?
• What sound typically indicates that cavitation is occurring?
• When calculating water flow, what unit is primarily focused on in water mains?
• What is the ideal state of a bacteria sample bottle when preparing it for collection?
• When collecting THM samples, what is the requirement for the sample site?
• What can be a consequence of not fully opening a dry barrel hydrant?
• What percentage of available chlorine is found in sodium hypochlorite?
• How can UV radiation be used in water treatment?
• What type of material should be avoided as backfill for water mains?
• What is the main function of a water softener?
• What is the ideal temperature range for drinking water?
• What role does pH play in water treatment?
• Which process does not contribute to the reduction of pathogens in drinking water?
• What is the purpose of throttling a gate valve?
• Who must be trained to collect bacteria samples correctly?
• How many pounds of water are there in a cubic foot of water?
• What is the cost per thousand gallons for a public water supply pumping 3,000,000 gallons in 30 days at a total expense of $8,770?
• During which process must a technician strictly follow defined procedures to avoid contamination?
• What is the primary reason for maintaining proper water pressure in a distribution system?
• If a well pump motor is wired backwards, what will happen?
• What should be done immediately if a pump starts making unusual noises?
• How many pounds of water are in 50,000 gallons of water?
• What does the acronym 'RCRA' refer to regarding hazardous waste?
• How often are routine bacteria samples collected at a water supply using groundwater sources not influenced by surface water?
• What does well yield refer to?
• What does the "C" factor of a pipe refer to?
• How long must bacteria samples be analyzed after collection?
• What is the industry standard for acceptable water loss in a public water supply?
• What is the ideal chlorine residual in a distribution system after 24 hours?
• What is the maximum allowable turbidity level in drinking water after treatment?
• Which disinfectant is considered the strongest among the following?
• What is the function of a pressure regulator in a water system?
• The higher the "C" factor of a pipe, the _____________ the pipe and the greater the carrying capacity of the pipe.
• What is the minimum vertical gap in an air gap required to prevent backflow?
• What is the required range of fluoride in mg/l to be in compliance with Illinois Department of Public Health regulations?
• Why is it important to maintain appropriate levels of free chlorine in a distribution system?
• What is the relevance of pH in water quality testing?
• Trihalomethanes (THMs) are caused by which of the following?
• Where is an altitude valve typically located?
• What is specific capacity in relation to groundwater?
• A three-quarter inch service line is tapped on a water main. The corporation stop should be installed__________________.
• What is the primary process used to remove dissolved iron and manganese from water?
• What is the role of a weep hole in a hydrant?
• Which of the following can cause a drop in water pressure from a well?
• What is the main purpose of an air release valve in a pumping system?
• When collecting a bacteria sample, how should the lid of the sample bottle be handled?
• What is a typical product used to adjust the pH of water upwards?
• What is the average flow of a 5/8 inch x 3/4 inch water meter expressed in gallons per minute (gpm)?
• How often should water quality monitoring records be reviewed?
• How long would it take to completely flush a 4-inch water main that is 5,000 feet long at a flow rate of 325 gallons per minute?
• What is the role of a pump motor base seal?
• Which component helps to control air and pressure in a pipeline?
• Which of the following is a critical component in monitoring water quality?
• What is the purpose of poly-pigging a water main?
• What is the primary benefit of knowing the flow rate of a hydrant?
• What is the effect of increased chlorine levels in water?