WASTEWATER GRADE 1 TEST 2025 WITH
300 PRACTICE QUESTIONS AND CORRECT
ANSWERS/ WASTEWATER TREATMENT
OPERATOR GRADE 1 CERTIFICATION
TEST 2025 (BRAND NEW!)
Which one of the following infectious diseases is NOT transmitted by wastewater
a. tetanus
b. tuberculosis
c. AIDS
d. polio
the acquired immune deficiency syndrome AIDS virus
How often should sedimentation basics with mechanical sludge removal equipment
be drained and inspected?
b. once a year
What is the most important reason to reduce turbidity?
b. to remove pathogens
Which is the filtration flow rate through a manganese green-sand pressure filter?
b. 2-3 gpm/sq. ft
The saying "When a filter is ripening", what does it mean?
c. it is becoming more efficient in particle removal
Virgin green-sand can be regenerated by soaking the filter bed for several hours in
a solution of chlorine containing:
c. 100 mg/L CL2
It is hardest to kill the organism that causes which one of the following illnesses?
a. Cholera
b. Typhoid
pg. 1
,c. Cryptosporidiosis
d. Infectious hepatitis
c. Cryptosporidiosis
Disinfection of water wells with free chlorine requires exposure
for ____at a concentration of
_____
c. 12 to 24hrs; 50 mg/L
Which role does the action of straining of suspended particles play during
filtration?
a. minor
The turbidity of settled water before it is applied to the filters (post sedimentation
process) should always be kept below:
a. 1-2 ntu
What precipitate can foul a cation exchange resin?
d. iron and manganese
What process works best from sequestering manganese?
d. poly-phosphates and chlorine
When should poly-phosphates used for sequestration of iron and manganese from a
well, be inject into the process?
d. right after the water leaves the cell
Re-carbonation is:
a. adding CO2 to the water
In the ion-exchange softening process, once the resin can no longer soften water it
must be______
c. regenerated
Under no circumstances should a composite sample be collected for which type of
analysis?
a. bacteriological
pg. 2
,The number on monthly distribution system chlorine residual samples required is:
c. based on population
What is the ideal indicator for pathogens
b. coliform group bacteria
When one substance is dissolved in another and will not settle out, its is called a
________
d. solution
Acids, bases, and salts lacking carbon are:
inorganic compounds
Which type of violation requires an all clear notification to the public?
a. tier I
b. tier 2
c. tier 3
d. tier 4
a. tier 1
How many coliform positive samples are allowed each month for water systems
that collect less than 40 samples per month?
a. 1
If a water sample tests positive for coliforms, the system must collect a set of
repeat samples within:
b. 24 hours
A public water system has at least_____, service connections or serves____or
more persons_____or more days each year.
c. 15;25;60
Where are the sampling points located for required sampling of coliform bacteria
in a community water system?
a. at consumers' faucets
Which one of the following gases is least likely to collect in a below-ground vault?
pg. 3
, carbon monoxide
When working in a manhole, your vehicle, whenever possible, should be placed
between the manhole and oncoming traffic
OSHA requires that adequate protection, such as shoring, be placed in any trench
that is
5 ft or greater in depth
How far back from the opening of a trench should soil be excavated from that
trench be placed
2 ft at least
In a trench, ladders are required every
25 ft
How many ladders are required to be in a 5-ft deep trench when 6 people are
working down the trench
6 ladders
which is not an essential ingredient for all ordinary fires?
a. ignition source
b. fuel
c. heat
d. oxygen
ignition source
If some clothes are on fire, what class of fire is it?
class D
If some magnesium is on fire, what class of fire is it?
3
What is the minimum number of people that should be on-site working at a
confined space site? where one of them is entering a manhole
3
pg. 4
300 PRACTICE QUESTIONS AND CORRECT
ANSWERS/ WASTEWATER TREATMENT
OPERATOR GRADE 1 CERTIFICATION
TEST 2025 (BRAND NEW!)
Which one of the following infectious diseases is NOT transmitted by wastewater
a. tetanus
b. tuberculosis
c. AIDS
d. polio
the acquired immune deficiency syndrome AIDS virus
How often should sedimentation basics with mechanical sludge removal equipment
be drained and inspected?
b. once a year
What is the most important reason to reduce turbidity?
b. to remove pathogens
Which is the filtration flow rate through a manganese green-sand pressure filter?
b. 2-3 gpm/sq. ft
The saying "When a filter is ripening", what does it mean?
c. it is becoming more efficient in particle removal
Virgin green-sand can be regenerated by soaking the filter bed for several hours in
a solution of chlorine containing:
c. 100 mg/L CL2
It is hardest to kill the organism that causes which one of the following illnesses?
a. Cholera
b. Typhoid
pg. 1
,c. Cryptosporidiosis
d. Infectious hepatitis
c. Cryptosporidiosis
Disinfection of water wells with free chlorine requires exposure
for ____at a concentration of
_____
c. 12 to 24hrs; 50 mg/L
Which role does the action of straining of suspended particles play during
filtration?
a. minor
The turbidity of settled water before it is applied to the filters (post sedimentation
process) should always be kept below:
a. 1-2 ntu
What precipitate can foul a cation exchange resin?
d. iron and manganese
What process works best from sequestering manganese?
d. poly-phosphates and chlorine
When should poly-phosphates used for sequestration of iron and manganese from a
well, be inject into the process?
d. right after the water leaves the cell
Re-carbonation is:
a. adding CO2 to the water
In the ion-exchange softening process, once the resin can no longer soften water it
must be______
c. regenerated
Under no circumstances should a composite sample be collected for which type of
analysis?
a. bacteriological
pg. 2
,The number on monthly distribution system chlorine residual samples required is:
c. based on population
What is the ideal indicator for pathogens
b. coliform group bacteria
When one substance is dissolved in another and will not settle out, its is called a
________
d. solution
Acids, bases, and salts lacking carbon are:
inorganic compounds
Which type of violation requires an all clear notification to the public?
a. tier I
b. tier 2
c. tier 3
d. tier 4
a. tier 1
How many coliform positive samples are allowed each month for water systems
that collect less than 40 samples per month?
a. 1
If a water sample tests positive for coliforms, the system must collect a set of
repeat samples within:
b. 24 hours
A public water system has at least_____, service connections or serves____or
more persons_____or more days each year.
c. 15;25;60
Where are the sampling points located for required sampling of coliform bacteria
in a community water system?
a. at consumers' faucets
Which one of the following gases is least likely to collect in a below-ground vault?
pg. 3
, carbon monoxide
When working in a manhole, your vehicle, whenever possible, should be placed
between the manhole and oncoming traffic
OSHA requires that adequate protection, such as shoring, be placed in any trench
that is
5 ft or greater in depth
How far back from the opening of a trench should soil be excavated from that
trench be placed
2 ft at least
In a trench, ladders are required every
25 ft
How many ladders are required to be in a 5-ft deep trench when 6 people are
working down the trench
6 ladders
which is not an essential ingredient for all ordinary fires?
a. ignition source
b. fuel
c. heat
d. oxygen
ignition source
If some clothes are on fire, what class of fire is it?
class D
If some magnesium is on fire, what class of fire is it?
3
What is the minimum number of people that should be on-site working at a
confined space site? where one of them is entering a manhole
3
pg. 4
