REHS STUDY GUIDE 2026 EXAM QUESTIONS AND
ANSWERS RATED A+
✔✔Pool inlets should be located a minimum of 10 inches to 15 inches below the water
line to:
a. ensure good mixing
b. prevent clogging
c. prevent loss of disinfectant
d. ensure mixing of pH additives poured into the pool - ✔✔prevent loss of disinfectant
✔✔When chlorine is added to water:
a. one acid is formed
b. two acids are formed
c. HCL is considered the primary product
d. ozone is produced in large quantities - ✔✔one acid is formed
✔✔The connection between the pool drain and the sanitary sewer must:
a. be solid copper no less than 3 inches in diameter
b. be solid cast iron or NSF approved PVC
c. have a properly located cleanout
d. be provided with an air gap no less than 2 pipe diameters of the discharge pipe -
✔✔be provided with an air gap no less than 2 pipe diameters of the discharge pipe
✔✔If an REHS receives a complaint about an abandoned swimming pool that is green
colored and has mice, what should he or she do first?
a. verify with an inspection
b. contact another agency and discuss the details
c. discuss code with complainant, dismiss the complaint
d. catch the mice - ✔✔verify with an inspection
✔✔Lighting, circuits and nearby receptacles should be protected by ground-fault circuit-
interupters are required to help prevent ____. - ✔✔Electrocution
✔✔___ ___ is used to reduce the chlorine loss by protecting the free chlorine in the pool
from the sun's ultraviolet rays, reducing the amount of chlorine needed to maintain
proper sanitizer levels. - ✔✔Cyanuric Acid
✔✔In Utah, concentration of cyanuric acid in the water must be at least ___ milligrams
per liter, but may not exceed 100 mg per liter - ✔✔10, 100
,✔✔Areas exposed to high levels of sunlight should maintain ___-___ ppm cyanuric acid
- ✔✔60-80
✔✔Under normal sunlight conditions ___-___ ppm cyanuric acid should be maintained -
✔✔30-50
✔✔Diarrhea in a pool, chlorine level is raised to what and for how long?
a. 3 ppm, 19 minutes
b. 20 ppm, 12.75 hours
c. 7 ppm, 120 hours
d. 10 ppm, 72 hours - ✔✔20 ppm, 12.75 hours
✔✔Which chemical will lower pH in a pool?
a. ozone
b. dichlor
c. trichlor
d. calcium hypochlorite - ✔✔trichlor
✔✔Which is the slowest pool filter? - ✔✔Cartridge
✔✔What is best for a leaking septic tank?
a. replace every 5 years
b. cover with a metal lining
c. inject seams with an epoxy resin - ✔✔inject seams with an epoxy resin
✔✔Common causes of failure of septic tank seepage field systems include improper
sizing, non-suitable soil, non-servicing, and:
a. insufficient nutrients in tank
b. excessive use of laundry detergents
c. leaking fixtures
d. use of wetting agents - ✔✔leaking fixtures
✔✔After servicing a septic tank, it is important that the tank or lid be: - ✔✔replaced and
secured for security purposes
✔✔After a septic tank has been cleaned it should not be disinfected, why?
a. the sludge sticking to the insides would have a seeding effect and assist in renewing
the bacterial activity
b. you cannot pay anybody enough money to crawl inside one and clean it
, c. it would be considered a safety hazard
d. a and c above - ✔✔a and c above
✔✔First thing you do when a new septic tank is installed?
a. add yeast, wait 6 months
b. use as normal - ✔✔use as normal
✔✔How deep should the absorption beds and trenches in a drainfield be for a septic
system?
a. Deep (12 ft) and sloped
b. shallow (1-5 ft) and level - ✔✔shallow (1-5 ft) and level
✔✔What formation should an absorption beds be with a water table of 6 inches? -
✔✔Mounded
✔✔How often should a septic tank be inspected?
a. annually
b. biannually
c. every 5 years - ✔✔biannually
✔✔How often should septic tank be pumped?
a. every 3-5 years, depending on use
b. everyday
c. never
d. annually - ✔✔every 3-5 years, depending on use
✔✔A septic tank is found to be sitting in a high water table, what is a possible
consequence? - ✔✔The tank may float or tilt
✔✔A newly installed septic system can be used within:
a. 24 hours
b. 6 months
c. immediately - ✔✔immediately
✔✔Sludge can be disposed of in all of the following ways except:
a. composting
b. landfill
c. ocean dumping
ANSWERS RATED A+
✔✔Pool inlets should be located a minimum of 10 inches to 15 inches below the water
line to:
a. ensure good mixing
b. prevent clogging
c. prevent loss of disinfectant
d. ensure mixing of pH additives poured into the pool - ✔✔prevent loss of disinfectant
✔✔When chlorine is added to water:
a. one acid is formed
b. two acids are formed
c. HCL is considered the primary product
d. ozone is produced in large quantities - ✔✔one acid is formed
✔✔The connection between the pool drain and the sanitary sewer must:
a. be solid copper no less than 3 inches in diameter
b. be solid cast iron or NSF approved PVC
c. have a properly located cleanout
d. be provided with an air gap no less than 2 pipe diameters of the discharge pipe -
✔✔be provided with an air gap no less than 2 pipe diameters of the discharge pipe
✔✔If an REHS receives a complaint about an abandoned swimming pool that is green
colored and has mice, what should he or she do first?
a. verify with an inspection
b. contact another agency and discuss the details
c. discuss code with complainant, dismiss the complaint
d. catch the mice - ✔✔verify with an inspection
✔✔Lighting, circuits and nearby receptacles should be protected by ground-fault circuit-
interupters are required to help prevent ____. - ✔✔Electrocution
✔✔___ ___ is used to reduce the chlorine loss by protecting the free chlorine in the pool
from the sun's ultraviolet rays, reducing the amount of chlorine needed to maintain
proper sanitizer levels. - ✔✔Cyanuric Acid
✔✔In Utah, concentration of cyanuric acid in the water must be at least ___ milligrams
per liter, but may not exceed 100 mg per liter - ✔✔10, 100
,✔✔Areas exposed to high levels of sunlight should maintain ___-___ ppm cyanuric acid
- ✔✔60-80
✔✔Under normal sunlight conditions ___-___ ppm cyanuric acid should be maintained -
✔✔30-50
✔✔Diarrhea in a pool, chlorine level is raised to what and for how long?
a. 3 ppm, 19 minutes
b. 20 ppm, 12.75 hours
c. 7 ppm, 120 hours
d. 10 ppm, 72 hours - ✔✔20 ppm, 12.75 hours
✔✔Which chemical will lower pH in a pool?
a. ozone
b. dichlor
c. trichlor
d. calcium hypochlorite - ✔✔trichlor
✔✔Which is the slowest pool filter? - ✔✔Cartridge
✔✔What is best for a leaking septic tank?
a. replace every 5 years
b. cover with a metal lining
c. inject seams with an epoxy resin - ✔✔inject seams with an epoxy resin
✔✔Common causes of failure of septic tank seepage field systems include improper
sizing, non-suitable soil, non-servicing, and:
a. insufficient nutrients in tank
b. excessive use of laundry detergents
c. leaking fixtures
d. use of wetting agents - ✔✔leaking fixtures
✔✔After servicing a septic tank, it is important that the tank or lid be: - ✔✔replaced and
secured for security purposes
✔✔After a septic tank has been cleaned it should not be disinfected, why?
a. the sludge sticking to the insides would have a seeding effect and assist in renewing
the bacterial activity
b. you cannot pay anybody enough money to crawl inside one and clean it
, c. it would be considered a safety hazard
d. a and c above - ✔✔a and c above
✔✔First thing you do when a new septic tank is installed?
a. add yeast, wait 6 months
b. use as normal - ✔✔use as normal
✔✔How deep should the absorption beds and trenches in a drainfield be for a septic
system?
a. Deep (12 ft) and sloped
b. shallow (1-5 ft) and level - ✔✔shallow (1-5 ft) and level
✔✔What formation should an absorption beds be with a water table of 6 inches? -
✔✔Mounded
✔✔How often should a septic tank be inspected?
a. annually
b. biannually
c. every 5 years - ✔✔biannually
✔✔How often should septic tank be pumped?
a. every 3-5 years, depending on use
b. everyday
c. never
d. annually - ✔✔every 3-5 years, depending on use
✔✔A septic tank is found to be sitting in a high water table, what is a possible
consequence? - ✔✔The tank may float or tilt
✔✔A newly installed septic system can be used within:
a. 24 hours
b. 6 months
c. immediately - ✔✔immediately
✔✔Sludge can be disposed of in all of the following ways except:
a. composting
b. landfill
c. ocean dumping
