REHS/RS Waste Water and Potable Water Practice Test

These questions are part of the practice quiz. Start practicing

• How much liquid bleach should be used to treat 1000 gallons of bacteria-contaminated water for drinking?
• Which of the following are the main stages of wastewater treatment?
• What is a key outcome of proper lead testing in drinking water?
• What is commonly used for the disinfection of water?
• What causes backflow of nonpotable materials into a potable water system?
• What is the primary goal of water conservation?
• What role does a drain field play in a septic system?
• What is the primary purpose of a water sampling plan?
• What is one major challenge in managing drinking water supplies?
• What defines potable water?
• Which of the following is NOT commonly used for disinfecting water?
• What is a common cause of well contamination?
• Which of the following describes a challenge posed by pollution in water management?
• What are coliform bacteria used for in water testing?
• What is the best method for preventing backflow in water systems?
• What are the end products of a properly functioning septic system?
• How frequently should water samples be tested in a community water system?
• What is the primary reason for establishing effluent discharge permits?
• What are the two major classifications of water from the water supply?
• Which contaminants can ozone treatment effectively eliminate?
• What disease is a wastewater treatment plant employee at high risk of contracting?
• What is not a satisfactory solution to chemical contamination in a well?
• What is one of the factors NOT influencing groundwater pollution?
• What classification should water be given when coliform organisms are detected?
• What is the primary purpose of using an air gap in water systems?
• A stream with dissolved oxygen levels below 6 mg/L is likely to:
• How does chlorine interact with pH levels during disinfection?
• What is a crucial factor in ensuring the quality of water resources?
• What is included in the concept of 'risk assessment' for potable water systems?
• What process is used to control the growth of algae and protozoa in water?
• What is considered a safe dissolved oxygen level to ensure aquatic life viability?
• How soon can a new septic system be used after installation?
• Granular activated carbon (GAC) filters are particularly effective for which of the following?
• What does effective community education around water quality typically include?
• In the context of water quality, high fecal coliform levels typically indicate:
• Which water treatment method aims to remove particulate matter and pathogens?
• What is the wastewater from a water closet commonly referred to as?
• What represents a level of fecal coliform contamination that requires attention?
• What kind of finish does a new concrete septic tank need?
• What is the minimum distance of separation between a sewage line and a water line in a mobile home park?
• Which method is commonly used to assess the potability of drinking water?
• What determines the frequency of water sampling?
• When locating a groundwater supply, what factor should not be a prime consideration?
• How often should fluoride levels be monitored in potable water systems?
• How deep and level should the absorption beds and trenches in a septic system drain field be?
• Diatomaceous earth filters should be enhanced by what method?
• Which stage of wastewater treatment involves the removal of larger solids?
• Which factors affect surface water quality?
• What does the Safe Drinking Water Act regulate?
• Which factor contributes to the risk of harmful bacteria in well water?
• How much sewage do residential cesspool and septic tank systems discharge annually?
• What does the control of infectious intestinal diseases in humans require?
• What is a common method to reduce fluoride levels in drinking water?
• What is the significance of chlorine residual in drinking water distribution systems?
• How does disinfection work in wastewater treatment?
• Which of the following compounds contributes to water hardness?
• What will water turbidity do to the quality of water?
• Which of the following is a consequence of well casings not being properly sealed?
• Which method can remove over 90% of sodium arsenate from water?
• At what exposure level can hydrogen sulfide be fatal?
• What is a common method for monitoring drinking water quality?
• What is a common strategy to manage increased water demand?
• Which establishment produces the highest amount of wastewater?
• What is the process of desalination?
• What is the most widely used chemical to destroy microorganisms?
• What information can be obtained from groundwater monitoring wells?
• What is the primary reason for conducting a sanitary survey?
• What is a common indicator of septic system failure?
• What is fundamental for the control of chemicals in drinking water?
• What should be done with a septic tank lid after service is performed?
• Which of the following is NOT a common cause of septic tank seepage field system failure?
• What is an essential benefit of nutrient removal in water treatment?
• What contributes significantly to the challenge of drinking water supply management?
• What type of well is NOT considered a groundwater system?
• What is the most favorable soil condition for removing viruses?
• Which types of soils are most suitable for subsurface absorption of wastewater?
• What is the primary goal of managing wastewater reuse?
• What is the function of the biosolids treatment process?
• In environmental assessments, extension of existing utilities is preferred because it:
• What kind of water makes it difficult to produce suds or to rinse laundry?
• What should the characteristics of a temporary water tank include?
• Which factor does NOT affect the reliability of the soil percolation test?
• What is the primary objective of a water quality testing program?
• What organism is most easily identified by laboratory analysis in water contaminated by feces?
• Which method is not practical for the removal of cadmium from water?
• What is an aquifer?
• A centrifugal pump is limited to a lift of how many feet?
• What does hydraulic conductivity measure?
• Which of the following indicates high levels of organic pollution in water?
• How many hours should a community water system pump average daily water demands to the storage tank?
• What is the recommended distance from the faucet to the top of the sink?
• Effective water resource management in subdivisions typically involves:
• What is the EPA stream quality indicator for dissolved oxygen in stream water?
• Which indicators signify a successful wastewater treatment process?
• What method for disease transmission is encouraged by the exposure of excreta or sewage on the surface of the ground?
• What effect does thermal pollution have on wastewater treatment?
• What primarily causes water hardness?
• For how long should a 1,000 gallon septic tank ideally hold wastewater?
• Which of the following is NOT used to disinfect water?
• What factors influence the safe distance between a well and a waste disposal system?
• What is often a consequence of increased demand on water resources?
• What contributes to the natural purification of surface water?
• What is the purpose of chemical coagulation in water treatment?
• What does infiltration refer to in wastewater systems?
• Where can low-pressure, vacuum, and cluster systems be effectively used?
• What is the role of activated sludge in wastewater treatment?
• Which chemical is most commonly used for disinfection in municipal water treatment?
• Under what circumstances should a contaminated well be abandoned?
• Which pathogens are known to travel the furthest in a wastewater treatment plant drain field?
• Which water characteristic is essential for ensuring proper disinfection efficiency?
• How does pollution impact drinking water sources?
• What does a Waste Discharge Permit regulate?
• What is the EPA stream water quality rate for fecal coliforms?
• If a sample of water contains 5,000 fecal coliform colonies per 100 ml of water, which environmental impact category does it fall into?
• What practice is utilized to monitor microbial water quality in potable systems?
• The traditional absorption field should be laid in trenches not more than how many inches below the ground surface?
• What is the main reason for regular monitoring of drinking water for microbial contaminants?
• What is a septic system?
• What is meant by the term effluent?
• What methods can be employed to prevent backsiphonage?
• Which factor is essential in the effective reuse of treated wastewater?
• What could high concentrations of nitrates in drinking water potentially lead to?
• Why is rigorous testing important in wastewater management?
• By what percentage should the size of a septic tank be increased if it has a garbage disposal unit?
• Which process increases the clarity of water by reducing particles?
• Which nutrients are primarily associated with eutrophication?
• What prevents run-off water from contaminating a well?
• How long can some common pathogenic organisms found in wastewater survive?
• Which of the following is NOT a common method for treating potable water?
• What is the relationship between effective water treatment and public health?
• Proper disinfection of water using chlorine depends on which factors?
• Who is typically not found at a wastewater treatment plant?
• Which soil type is least suitable for the subsurface absorption of wastewater?
• Which factors influence the rate of sedimentation in clarifiers?
• Which kind of well is considered the most dependable source of water?
• Why is the use of a cesspool prohibited?
• What are the main sources of potable water?
• What can high levels of coliform bacteria indicate about a water source?
• How often should a wastewater treatment facility conduct flow measurement?
• What is a soil percolation test?
• Using wastewater for irrigation can pose a health hazard if it contains which harmful metal?
• If there is no running water for flushing toilets, what is the best way to control raw sewage?
• What does the pilot testing process in water treatment plants involve?
• How much water can a leak no larger than 1/8 inch in diameter waste in a 24 hour period?
• What is least likely to be an issue in contaminating a well?
• Regular monitoring of fecal coliform is necessary to prevent:
• How much more groundwater is typically available compared to surface water?
• What is the desirable hardness level in drinking water?
• How is the strength of wastewater from a home or community commonly expressed?
• How can urban areas address challenges in drinking water sustainability?
• What does a septic system not include?
• On what factor does soil permeability primarily depend?
• What does the term “sludge” refer to in wastewater management?
• What is the best way to fix a leaking septic tank?
• What is the primary focus during the drinking water treatment process?
• What filters are best at removing amebic cysts?
• What effect can high turbidity in water have on disinfection processes?
• What can be considered a potential source of contamination for surface water supplies?
• Subdivision plans involving individual wells and sewage disposal systems must be designed to:
• How many gallons per year has sludge accumulation in a tank serving a normal home been estimated at?
• What is a bad way of taking groundwater samples?
• What is the potential health effect of drinking water with high nitrate concentrations?
• Which disinfecting compound can be used full strength for disinfection purposes?
• The preferred method for providing water and sewerage service in a subdivision is to:
• What is the purpose of chemical treatment in sewage sludge management?
• Calcium chloride affects water quality in what way?
• Which of the following is important when reusing treated wastewater?
• What is used to properly seal a drilled well to prevent contamination of the water supply?
• How is the amount of coliforms in water detected?
• What type of filter is recommended for use in small communities and rural areas?
• What substance is known for being non-toxic to aquatic organisms and adding oxygen to treated wastewater?
• In emergencies, what can small quantities of water be disinfected with?
• Which type of well is least likely to be contaminated?
• What does TSS represent in the context of wastewater management?
• The presence of coliform bacteria is often monitored to ensure:
• What establishment produces the most Biochemical Oxygen Demand (BOD)?
• What treatment stage follows primary treatment in wastewater management?
• How many porta potties should be available for a festival with 1,000 attendees and no alcohol?
• What is the most effective method for conducting a percolation test?
• What is the first thing to do when a new septic tank is installed?
• What typically causes cross-connections in water supply systems?
• What is a groundwater monitoring well used for?
• What is effective porosity or specific yield?
• What does the term "cross-connection" refer to in water systems?
• What could potentially happen if a septic tank is pumped during a wet period?
• What does the process of coagulation help to achieve in water treatment?
• What is the most common method of applying wastewater to land?
• What defines a cross connection in water systems?
• Why is lead testing important in older plumbing systems?
• What is the best type of drain field if there is a water table that raises 6 inches?
• What is water hardness an indication of?
• How is well contamination typically prevented?
• Which gases found in water encourage corrosion?
• Which residential feature can increase the load on a septic system?
• When a body of water has high Jackson Turbidity Units (JTU), what does it mean?
• What does BOD stand for in wastewater treatment?
• What is the primary function of a wastewater treatment plant?
• What is the role of filtration in water treatment?
• How often should septic tanks be pumped?
• What is a possible consequence of a septic tank sitting in a high water table?
• What distinguishes point source pollution from non-point source pollution?
• Why is pH important for potable water quality?
• What is the major constituent of wastewater?
• What is the primary focus of chlorine residual maintenance in water systems?
• Combined chlorine is effective in reducing fecal coliforms to what level?
• When drafting regulations for a wastewater system, an REHS should consult with which organization?
• What is the primary purpose of a septic tank?
• How does nutrient removal affect wastewater treatment efficiency?
• Which factor is most important for ensuring safe drinking water quality?
• How does temperature affect the treatment of wastewater?
• Ozone is effective against which of the following contaminants?
• Why is backflow prevention important?
• What should be monitored regularly in a septic system to ensure proper function?
• Why is pathogen reduction critical in sewage sludge management?
• Which of the following is a common method for wastewater disinfection?
• What is the significance of reducing pollutants before wastewater discharge?
• Which organism indicates past or possibly intermittent pollution in water?
• Which geophysical methods are utilized to investigate groundwater pollution?
• What are Nephelometric Turbidity Units (NTU) used to measure?
• What processes help to reduce EPA priority pollutants in water?
• What effect does the GAC filtration process promote?
• Are pharmaceuticals successfully removed by a wastewater treatment plant?
• Examples of groundwater systems include which of the following?
• What is the process known as quiescent settling in water bodies without additives called?
• What type of filtration system should be implemented in a small community?
• What is the purpose of an emergency response plan in water treatment facilities?
• What does porosity measure in geological terms?
• What is the most practical method for removing nitrates from water?
• What role do advanced treatment technologies play in wastewater management?
• What can enhance the sustainability of drinking water supplies?
• What level of alkalinity in water is considered desirable?
• How should the control of man-made pollutants in water begin?
• Microbial pollution typically travels only a short distance through which type of soil?
• Which of the following is an important consideration when planning sewage disposal in subdivisions?
• What does turbidity measure in water quality?
• When the water table is at 6 inches, what formation should the absorption bed be?
• Why shouldn't a septic tank be disinfected after cleaning?
• High concentrations of nitrates in drinking water can lead to which of the following conditions?
• What are the health risks associated with lead in drinking water?
• What percentage of BOD is typically removed by a trickling filter?
• What role does ultraviolet (UV) light play in wastewater treatment?
• What is the EPA stream water quality standard for fecal coliform?
• How often should a septic tank be inspected?
• What is an example of surface water supply?
• What does a mottled brown and red soil indicate?
• What water quality characteristic enables direct filtration to produce good quality water at a lower cost?
• What is essential to effectively manage wastewater quality?
• What are Nephelometric Turbidity Units (NTU) primarily used for?
• What does the presence of coliform bacteria in water indicate?
• What role does community education play in potable water quality protection?
• Which gases may sewer gas potentially contain?
• In the absence of running water for flushing toilets during a disaster, what is the best method to manage raw sewage?
• What is the purpose of a clarifier in wastewater treatment?
• Why is monitoring ammonia levels in treated wastewater important?