NEHA RS/REHS FINAL EXAM 2026/2027 QUESTIONS
AND SOLUTIONS RATED A+
✔✔Milligrams per Liter (mg/L) is the equivalent metric measure to: - ✔✔parts per million
(ppm)
✔✔liable to ignite spontaneously on exposure to air - ✔✔Pyrophoric
✔✔"RATITE" means - ✔✔a flightless bird such as an emu, ostrich, or rhea.
✔✔Which organization requires cover for baking dough - ✔✔BISSC (Baking Industry
Sanitation Standards Committee)
✔✔The Registered Sanitarians are first and foremost: - ✔✔Educators
✔✔Common microorganism associated with skin rash in whirlpools? -
✔✔Pseudomonas aeruginosa
✔✔Complaining of extreme eye irritation by swimmers in a swimming pool may be: -
✔✔Improper pH value
✔✔Workers in dental care may receive: - ✔✔Mercury Vapor poisoning
✔✔Most accidents that occur in the home to infants aged 1-4 is caused by: -
✔✔Walking/falling
✔✔Most accidents around swimming pools: - ✔✔Drowning
✔✔Which can adversely effect the nerve cell? - ✔✔Neurotoxin
✔✔This is usually found with Salmonella, caused by contaminated chicken source. High
rate of infection: - ✔✔Campylobacter jejuni
✔✔What is the most enteric disease: - ✔✔Norwalk virus
✔✔The LEAST amount of backfill over the absorption field should be: - ✔✔12-18 inches
✔✔Best method to avoid UST (Underground Storage Tank)problems: - ✔✔Prevent
corrosion
✔✔Filters will: - ✔✔Reduce stray radiation
✔✔Swimmers ear is caused by: - ✔✔Pseudomonas
,✔✔A principle for effective radiation protection: - ✔✔distance, time, shielding
✔✔Radiation could scatter and bounce off the - ✔✔wall, floor, ceiling
✔✔Know characteristics of alpha particles - ✔✔Are they made of protons & neutrons?
Yes
Is absorbed the most matter? No
Do they have a high penetration rate? No
✔✔Which test is initially used if water is suspected of contamination with fecal matter? -
✔✔FECAL coliform.
✔✔Which one is the correct sequence? - ✔✔Coagulation-flocculation-sedimentation-
filtration
✔✔The minimum retention time recommended for a septic tank is: - ✔✔24 hours
✔✔Which filter is BEST to use for small communities in developing areas and in rural
locations? - ✔✔Slow sand filter
✔✔Which filter is BEST for removal of Giardia cysts from low turbidity water - ✔✔Slow
sand filter
✔✔Microbial pollution travels only a short distance through: - ✔✔Smooth clay
✔✔Backsiphonage may be prevented by all of the following methods except: -
✔✔Hydrostatic loops
✔✔Which of the following is NOT REQUIRED at a water treatment plant? - ✔✔A Pre-
incident Plan
✔✔Giardia is classified as a - ✔✔protozoa
✔✔Entamoeba Histolytica is a - ✔✔Protozoa
✔✔Which is the preferred field test for a water system (for residual chlorine)? - ✔✔DPD
✔✔Which is the measurement of the amount of light scattered by particles suspended
in water test sample? - ✔✔Nephelometric Turbidity Units (NTU)
✔✔Which is transmitted by food or water? - ✔✔Hepatitis A
,✔✔What is another name for swimmer's itch? - ✔✔Schistosoma spp
✔✔High concentrations of Nitrates in drinking water are: - ✔✔A possible cause of
methemoglobinemia (Blue Baby Syndrome)
✔✔Well head protection? - ✔✔casing, cap and surface seal
✔✔If a water sample is chlorinated: - ✔✔Use a bottle with Sodium Thiosulfate (acts as a
dechlor)
✔✔Water sampling technique when transporting to the lab? - ✔✔sterile glass or plastic
bottle is the most important (also using the right preservative is important)
✔✔Which steps are correct in stream cleaning? - ✔✔Stream pollution (organic) is
apparent along its length by a Zone of Degradation (just below the source), the Zone of
Active Decomposition, and the a Zone of Recovery or Self-Purification. O2 decreased in
Zone of Degredation suspended solids increased and sludge on the stream bottom.
✔✔Emergency water treatment? - ✔✔Boil for 1 minute. (100 degrees Celsius is 212
degrees Fahrenheit). Also can add suggested amount of chlorine per gallon of water
and let sit for 30 minutes. Can also use 8 drops of iodine tincture per quart of water.
Can also use 1 tsp of bleach per gallon of water
✔✔The composition of soil under an OSS drainfield is very important in the removal of
both viruses and bacteria. Which of the following soil conditions is most favorable for
removal of viruses? - ✔✔Fine loamy sand over course sand or gravel
✔✔NTU are most commonly used to? - ✔✔Determine turbidity
✔✔What causes water hardness? - ✔✔Minerals (Dissolved calcium and magnesium
bicarbonates, sulfates, and chlorides)
✔✔Water containing Nitrates generally indicates? - ✔✔Evidence of agricultural pollution
(Note: Ammonia in the water comes from decomposition of organic matter and is
evidence of fresh water pollution.)
✔✔Microbial pollution only travels a short distance through: - ✔✔Sandy loam or clay
(most dense soil type)
✔✔which of these techniques is used to properly seal a drilled well to prevent
contamination of the water supply? - ✔✔Grouting
, ✔✔One of the most common reasons for the contamination of the water supply coming
from a drilled well through rock, clay or hardpan is; - ✔✔Failure to seal the well casing
properly, improper grouting
✔✔The flushometer valve is typically protected by? - ✔✔A non-pressure type vacuum
breaker
✔✔A physical cross connection? - ✔✔Is a connection which may permit/allow the flow
from an unapproved (non-potable, ie. sewer) water supply into a potable (approved)
water supply.
✔✔Which type of filter is best to use to strain/remove amoebic cysts? -
✔✔Diatomaceous Earth Filter, Slow Sand and/or Cartridge
✔✔What makes water have a color? - ✔✔Dissolved Solids
✔✔The importance of surveys for new well water? - ✔✔determine the safety and
adequacy of the water supply
✔✔Lime can be used to treat high concentrations of: - ✔✔contaminants
✔✔Which one is best used to remove/control color, taste, and odor? - ✔✔GAC-granular
activated carbon filter
✔✔Which type of filtration method is the least effective? - ✔✔Rapid sand filter
✔✔What are the four characteristics of hazardous wastes? - ✔✔TIRC - toxic, ignitable,
reactive, and corrosive
✔✔Most institutions are? - ✔✔Their own communities
✔✔the importance of a ground fault interrupter? - ✔✔Automatically shut off the electric
power at the source
✔✔What is the most common type of injury that occurs at home? - ✔✔Falling (children
1-4)
✔✔For fire safety requirements a room must have: - ✔✔Dual Egress
✔✔Asbestos found in older homes - ✔✔Found in homes built in and before the 1970's
(found in floor tiles and acoustic plaster ceiling when it deteriorates.)
AND SOLUTIONS RATED A+
✔✔Milligrams per Liter (mg/L) is the equivalent metric measure to: - ✔✔parts per million
(ppm)
✔✔liable to ignite spontaneously on exposure to air - ✔✔Pyrophoric
✔✔"RATITE" means - ✔✔a flightless bird such as an emu, ostrich, or rhea.
✔✔Which organization requires cover for baking dough - ✔✔BISSC (Baking Industry
Sanitation Standards Committee)
✔✔The Registered Sanitarians are first and foremost: - ✔✔Educators
✔✔Common microorganism associated with skin rash in whirlpools? -
✔✔Pseudomonas aeruginosa
✔✔Complaining of extreme eye irritation by swimmers in a swimming pool may be: -
✔✔Improper pH value
✔✔Workers in dental care may receive: - ✔✔Mercury Vapor poisoning
✔✔Most accidents that occur in the home to infants aged 1-4 is caused by: -
✔✔Walking/falling
✔✔Most accidents around swimming pools: - ✔✔Drowning
✔✔Which can adversely effect the nerve cell? - ✔✔Neurotoxin
✔✔This is usually found with Salmonella, caused by contaminated chicken source. High
rate of infection: - ✔✔Campylobacter jejuni
✔✔What is the most enteric disease: - ✔✔Norwalk virus
✔✔The LEAST amount of backfill over the absorption field should be: - ✔✔12-18 inches
✔✔Best method to avoid UST (Underground Storage Tank)problems: - ✔✔Prevent
corrosion
✔✔Filters will: - ✔✔Reduce stray radiation
✔✔Swimmers ear is caused by: - ✔✔Pseudomonas
,✔✔A principle for effective radiation protection: - ✔✔distance, time, shielding
✔✔Radiation could scatter and bounce off the - ✔✔wall, floor, ceiling
✔✔Know characteristics of alpha particles - ✔✔Are they made of protons & neutrons?
Yes
Is absorbed the most matter? No
Do they have a high penetration rate? No
✔✔Which test is initially used if water is suspected of contamination with fecal matter? -
✔✔FECAL coliform.
✔✔Which one is the correct sequence? - ✔✔Coagulation-flocculation-sedimentation-
filtration
✔✔The minimum retention time recommended for a septic tank is: - ✔✔24 hours
✔✔Which filter is BEST to use for small communities in developing areas and in rural
locations? - ✔✔Slow sand filter
✔✔Which filter is BEST for removal of Giardia cysts from low turbidity water - ✔✔Slow
sand filter
✔✔Microbial pollution travels only a short distance through: - ✔✔Smooth clay
✔✔Backsiphonage may be prevented by all of the following methods except: -
✔✔Hydrostatic loops
✔✔Which of the following is NOT REQUIRED at a water treatment plant? - ✔✔A Pre-
incident Plan
✔✔Giardia is classified as a - ✔✔protozoa
✔✔Entamoeba Histolytica is a - ✔✔Protozoa
✔✔Which is the preferred field test for a water system (for residual chlorine)? - ✔✔DPD
✔✔Which is the measurement of the amount of light scattered by particles suspended
in water test sample? - ✔✔Nephelometric Turbidity Units (NTU)
✔✔Which is transmitted by food or water? - ✔✔Hepatitis A
,✔✔What is another name for swimmer's itch? - ✔✔Schistosoma spp
✔✔High concentrations of Nitrates in drinking water are: - ✔✔A possible cause of
methemoglobinemia (Blue Baby Syndrome)
✔✔Well head protection? - ✔✔casing, cap and surface seal
✔✔If a water sample is chlorinated: - ✔✔Use a bottle with Sodium Thiosulfate (acts as a
dechlor)
✔✔Water sampling technique when transporting to the lab? - ✔✔sterile glass or plastic
bottle is the most important (also using the right preservative is important)
✔✔Which steps are correct in stream cleaning? - ✔✔Stream pollution (organic) is
apparent along its length by a Zone of Degradation (just below the source), the Zone of
Active Decomposition, and the a Zone of Recovery or Self-Purification. O2 decreased in
Zone of Degredation suspended solids increased and sludge on the stream bottom.
✔✔Emergency water treatment? - ✔✔Boil for 1 minute. (100 degrees Celsius is 212
degrees Fahrenheit). Also can add suggested amount of chlorine per gallon of water
and let sit for 30 minutes. Can also use 8 drops of iodine tincture per quart of water.
Can also use 1 tsp of bleach per gallon of water
✔✔The composition of soil under an OSS drainfield is very important in the removal of
both viruses and bacteria. Which of the following soil conditions is most favorable for
removal of viruses? - ✔✔Fine loamy sand over course sand or gravel
✔✔NTU are most commonly used to? - ✔✔Determine turbidity
✔✔What causes water hardness? - ✔✔Minerals (Dissolved calcium and magnesium
bicarbonates, sulfates, and chlorides)
✔✔Water containing Nitrates generally indicates? - ✔✔Evidence of agricultural pollution
(Note: Ammonia in the water comes from decomposition of organic matter and is
evidence of fresh water pollution.)
✔✔Microbial pollution only travels a short distance through: - ✔✔Sandy loam or clay
(most dense soil type)
✔✔which of these techniques is used to properly seal a drilled well to prevent
contamination of the water supply? - ✔✔Grouting
, ✔✔One of the most common reasons for the contamination of the water supply coming
from a drilled well through rock, clay or hardpan is; - ✔✔Failure to seal the well casing
properly, improper grouting
✔✔The flushometer valve is typically protected by? - ✔✔A non-pressure type vacuum
breaker
✔✔A physical cross connection? - ✔✔Is a connection which may permit/allow the flow
from an unapproved (non-potable, ie. sewer) water supply into a potable (approved)
water supply.
✔✔Which type of filter is best to use to strain/remove amoebic cysts? -
✔✔Diatomaceous Earth Filter, Slow Sand and/or Cartridge
✔✔What makes water have a color? - ✔✔Dissolved Solids
✔✔The importance of surveys for new well water? - ✔✔determine the safety and
adequacy of the water supply
✔✔Lime can be used to treat high concentrations of: - ✔✔contaminants
✔✔Which one is best used to remove/control color, taste, and odor? - ✔✔GAC-granular
activated carbon filter
✔✔Which type of filtration method is the least effective? - ✔✔Rapid sand filter
✔✔What are the four characteristics of hazardous wastes? - ✔✔TIRC - toxic, ignitable,
reactive, and corrosive
✔✔Most institutions are? - ✔✔Their own communities
✔✔the importance of a ground fault interrupter? - ✔✔Automatically shut off the electric
power at the source
✔✔What is the most common type of injury that occurs at home? - ✔✔Falling (children
1-4)
✔✔For fire safety requirements a room must have: - ✔✔Dual Egress
✔✔Asbestos found in older homes - ✔✔Found in homes built in and before the 1970's
(found in floor tiles and acoustic plaster ceiling when it deteriorates.)
