Illinois EPA Class C Practice Test

These questions are part of the practice quiz. Start practicing

• What do the initials M.S.D.S stand for?
• What is the form of iron known as ferrous iron?
• What action should be taken when water pressure drops below the minimum required level?
• If water pH is 8.5, is it considered acidic or alkaline?
• Which chlorine residual contains hypochlorous acid and hypochlorite ion?
• How many inches above sewer lines should water mains ideally be located?
• Which type of fluoride should not be mixed with chlorine?
• What happens to trihalomethane levels when water stays in the distribution system longer?
• What is the typical size of a water meter for a single-family home?
• What type of test is most commonly used for a fluoride test?
• What does the water table define?
• Which practice is essential when collecting a bacteria water sample to ensure its accuracy?
• What should be included in monthly water reports at a Class C facility?
• From a one-ton chlorine cylinder, which valve is used to release liquid chlorine?
• If a chlorine gas victim experiences slight throat irritation, what action should be taken?
• To what maximum percentage will NaF go into solution?
• High levels of trihalomethanes have been associated with which health concern?
• What is the correct procedure if a chlorine cylinder falls?
• What is the proper way to store a 150-pound chlorine cylinder?
• Which type of samples must be collected without any air in them?
• Which device is typically used to prevent backflow in water supply systems?
• What condition would indicate that breakpoint chlorination is being used?
• What does the presence of coliform bacteria in a routine water sample indicate?
• How should a room housing the gas chlorination feed system be designed?
• What is a prerequisite for an applicant seeking Class C operator certification, assuming they are a high school graduate?
• What type of water meter is commonly found in residential homes?
• What substance combines with leaking chlorine gas to form a white smoke?
• How long should a sample collector flush a line while collecting a Bacti sample?
• In a water system, what is typically used to isolate part of the system?
• Which method can prevent issues with fluoride feed equipment?
• Why should water never be applied to a leaking chlorine cylinder?
• What is the risk of not maintaining proper chlorine residual in the water distribution system?
• What term is used for disease-causing microorganisms?
• A saturator is used for feeding which solution?
• Which of the following is a key consideration when designing a water distribution system?
• What health issue can high nitrate levels in water cause in infants?
• A fluoride level above 2.0 mg/l in drinking water may cause what condition?
• How often must a Reduced Pressure Zone (RPZ) device be tested?
• What is the primary purpose of a gate valve in a water system?
• How many years of hands-on experience is required for an applicant for the Class C operator certification?
• Which types of safety equipment are necessary when filling a hypochlorinator?
• What is the advantage of having a looped water system?
• What does a Variable Frequency Drive (VFD) motor control?
• What impact does tuberculation in piping have?
• Which kit is necessary to repair a leaking 150-pound chlorine cylinder?
• What is the first action taken upon receiving a chemical analysis printout?
• What is chloramine commonly referred to as?
• Which compound is utilized to sequester iron and/or manganese in water treatment?
• In a chemical feed pump, where does the solution typically enter the water line?
• What component should a chemical feed machine have on the feed line to avoid back siphonage when pumping sodium fluoride?
• What is the main advantage of using DPD testing for chlorine levels?
• To operate a chlorine cylinder valve at full capacity, it must be opened how far?
• Why is proper maintenance of water distribution system valves important?
• How often does the Illinois EPA require routine bacteria samples to be taken and analyzed?
• What could happen if the air vent plugs up in a water storage tank?
• What type of test is used to measure chlorine levels in water?
• What is the purpose of an anti-siphon valve in a positive displacement chemical feed pump?
• What do check valves in the discharge line of a chemical feed pump prevent?
• When replacing a rotameter, how should the small ball be handled?
• How soon must a bacteria water sample be mailed to initiate lab analysis?
• If a water plant needs to be fed more than 40 pounds of chlorine gas in a single day, what should be done?
• In order to function properly, what must be checked regularly in a chemical feed system?
• What is essential for the accurate operation of the fluoride feed system?
• What is the first component used when installing a water service?
• Where should gas chlorination equipment be located within a water treatment plant?
• In a gas chlorination unit, if water is venting to the atmosphere, what is the likely cause?
• What is the purpose of a fusible plug in a chlorine cylinder?
• What is the required distance between water lines and sewer lines?
• After adding powdered test reagent, when should the total chlorine residual be measured?
• What is the purpose of gravel packing a well?
• What is the main purpose of disinfection in well water systems?
• What is the drawdown of a well defined as?
• When should fluoride ion testing occur at the sampling location?
• Where is the foot valve located in a positive displacement chemical feed pump system?
• From a one-ton chlorine cylinder, which valve releases gaseous chlorine?
• Where are the pressure relief valves typically located in a water system?
• Who is qualified to perform a turbidity test?
• When treating well water containing soluble iron, when should polyphosphates be added?
• A higher C factor in a pipe indicates what?
• How should calcium hypochlorite be introduced when disinfecting a new water main?
• What is the action level for lead in drinking water?
• When collecting a total coliform sample, what is considered good practice regarding the sample cap?
• What is the Maximum Contaminant Level (MCL) for nitrates in drinking water?
• What should you do if a phosphate is added to your well water?
• At a manganese level of 0.04 mg/l, what kind of problems should be expected?
• If an altitude valve fails to close, what could potentially happen to the water storage tank?
• If a pump runs backwards momentarily after shutdown, what is the likely issue?
• What commonly causes issues with fluoride feed equipment?
• What does "MCL" stand for in relation to drinking water quality?
• What does the total chlorine residual include?
• What is the typical size of a water service line for a single family?
• What is the optimum range in mg/l for fluoride in treated water?
• Which factor can help determine the yield of a well?
• Who is responsible for determining chlorine residuals in the distribution system?
• How should any acid be mixed with water to ensure safety and effectiveness?
• A finished water with a negative Langelier index may be considered what?
• If a fluoride feed pump is clogged with hardness deposits, which diluted chemical should be used to dissolve the deposits?
• What is a safe practice when handling chlorine cylinders?
• Why must make-up or dilution water for a saturator be metered?
• What type of disinfection is used in wastewater treatment involving chlorination?
• What is the minimum combined chlorine residual required throughout a water distribution system in mg/l?
• At what temperature does a fusible plug in a chlorine cylinder melt?
• What can be done to prevent calcium tuberculation in a water main?
• Before operating a chemical feed pump, what must the operator ensure?
• When must the monthly operation report be submitted to the IEPA?
• In a chlorination process, which chemical is crucial for maintaining water quality?
• What defines a hypochlorinator used in a disinfection process?
• What is the chemical form of fluoride delivered to the treatment plant in liquid form?
• What chemical is used to raise the pH of water to reduce its corrosive action?
• What is the purpose of flushing a water main?
• What additional test should be conducted at the same time and location as a bacteria sample?
• How often should inspections occur in a water distribution system to ensure its efficiency?
• What is a water-bearing geological formation used as a water source called?
• Does turbidity affect THM levels?
• What is the primary function of a well screen?
• What color is SPADNS reagent?
• What does the term "disinfecting" refer to in water treatment?
• Which of the following is a key operational guideline for chemical feed pumps?
• What is the purpose of using a saturator in the fluoride feed system?
• At which iron level (mg/l) might discoloration in water occur?
• What is the recommended method for removing deposits on pumps or valves in a fluoride feed system?
• A medicinal taste in water may develop when free chlorine reacts with what?
• What is the minimum water pressure in psi that should be maintained in a water distribution system?
• Which water storage system utilizes compressed air to enhance water pressure?
• If the maximum chlorine gas withdrawal rate is exceeded from a 150-pound cylinder or a 1-ton container, what occurs?
• How many times heavier is chlorine gas compared to air?
• What is the main reason for adding fluoride ion to drinking water?
• A C factor in water treatment is an indication of what?
• What is a major consequence of a water service line being too small?
• If a bacteria test shows coliform and subsequent tests show fecal growth, how many samples must be collected?
• Which type of chemical feed pump is best suited for applications where accurate dosing is critical?
• What reacts with chlorine to create combined chlorine?
• What unit is commonly used to express velocity in water distribution systems?
• Where should the self-contained oxygen tank (SCOT pack) be stored?
• During a 24-hour operation time, what is the maximum withdrawal rate for a 150-pound chlorine gas cylinder?
• What substance is used to remove chlorine from a bacteria sampling bottle?
• What is a potential result if fluoride feed equipment experiences hardness deposits?
• Which naturally occurring radioactive substance can be found in well water?
• Why is sodium thiosulfate added to bacteria water sampling bottles?
• What type of kit is required to replace a 1-ton chlorine cylinder?
• A positive Langelier index may indicate what type of water?
• What is the main risk of a chemical feed pump operating outside of recommended ranges?
• To what level should a bacteria sample bottle be filled with water?
• The rotometer tube of a gas chlorinator indicates what measurement?
• When conducting the SPANDS procedure for fluoride testing, what should be consistent?
• What is the minimum water pressure a water pipe should be able to withstand?
• What is a swab used for during the installation of a new water main?
• What is one advantage of using positive displacement pumps?
• If a chlorine cylinder is leaking, what should be done first?
• Which of the following is a method for testing water quality?
• What substance can produce a positive Langelier index when added?
• What is the primary risk associated with iron bacteria in well water?
• In cases of bacterial contamination, when should repeat samples be taken?
• How often should a water system test for fluoride in its lab?
• What is the maximum level of fluoride in mg/l allowed in drinking water without public notice?
• What is the characteristic of sequestered manganese?
• How can H2S be removed from well water?
• Where is the fusible plug for a 150-pound chlorine cylinder located?
• Why should positive displacement feed pumps be operated at a range of 30-70%?
• What substance will sodium arsenite in the SPADNS reagent effectively remove?
• Which component is NOT part of a gas chlorine cylinder?
• What should you do with a potentially contaminated bacteriological sample bottle?
• What type of pump is used to feed chemical solutions?
• Which of the following best describes potable water?
• If the chlorine demand is 2.5 mg/l and the desired residual is 0.6 mg/l, what should be the chlorine dose?
• What is the required free chlorine residual in solutions made from dry fluoride chemicals?
• What is the average per capita water usage in the United States per day?
• What is the minimum free chlorine residual required throughout a water distribution system in mg/l?
• At what angle should the corp stop be installed?
• At what percentage should a chemical feed pump be operated for optimal performance?
• Why is the corp stop required to be placed at 45 degrees?
• After addition of the powder test reagent, when should the free chlorine residual be determined?
• Which of the following is not an iron bacteria that occurs in well water?
• What might indicate a problem with well water quality?
• Which factor is crucial for ensuring safe drinking water?
• What should be done for an operator experiencing a mild case of chlorine gas inhalation?
• How should empty chlorine cylinders be stored?
• What is the first step in the process of shutting down a gas chlorinator?
• What should be avoided during the collection of a bacteria sample?
• What is considered an acceptable level of fluoride in drinking water?
• Why should a well pump and/or column pipe be disinfected before reinstallation?
• What type of water is recommended to avoid issues with fluoride feed systems?
• What should always be used when making a connection from a chlorine ton container or a 150-pound container to a gas chlorination system?
• Which of the following is a sign of a possible chlorine leak?
• What is the main risk when chlorine gas is exposed to heat?
• What is the primary purpose of an electrical circuit breaker?
• What is a pitless adapter?
• How do all chlorinators that feed chlorine gas into water operate?
• What does poly pigging do in a water main?
• What component is essential for controlling backflow in a water system?
• What is an expected pH range for most drinking water?
• Which type of chlorine residual is most likely to cause taste and odor problems?
• Chlorine dosage is equal to what?
• What is the Maximum Contaminant Level (MCL) for Total Trihalomethanes (TTHMs)?
• As the water pH increases, which substance will decrease in total amount?
• What is the primary concern when chlorine is present in a water sample meant for bacteria testing?
• Which property of fluoride can affect its testing compatibility with chlorine?
• If a chlorine cylinder is full at 150 pounds and marked with RW 125, how much chlorine does it contain?
• Where can the maximum contaminant levels for contaminants be found?
• Which chlorine residual is known to last the longest time in the distribution system?
• What does a foot valve do in a well's pump suction line?
• A full 150-pound chlorine gas cylinder with a tare weight of 90 pounds weighs about how many pounds?
• An evaporator is used for which purpose?