Class A Water Operator Exam
Questions With Correct Detailed
And Verified Solutions Graded A+
(2025-2026 Latest Update)!!!
How many Training Hours and experience for a class D Water
Operator
16 Hours Training and No Experience
How many Training Hours and experience for a class C Water
Operator
36 Hours Training and 1 year Experience
How many Training Hours and experience for a class B Water
Operator
100 Hours Training and 3 years’ Experience (must include 1 year of
hands on experience)
How many Training Hours and experience for a class A Water
Operator
200 Hours Training and 5 years’ Experience (must include 2 years of
hands on experience)
How many Training Hours and experience for a Class C Lab Operator
32 Hours and no experience
How many Training Hours and experience for a Class B Lab Operator
,32 hours of C and 32 hours of B and 6 months experience.
***associate in science can substitute 32hrs of C level training
How many Training Hours and experience for a Class A Lab Operator
32 hours of B and 1 year experience. ***Must include a Bachelor in
science
How many Training Hours and experience for a Class C Distribution
Operator
36hours and 1 year experience
How many Training Hours and experience for a Distribution
Technician
8 hours and no training.
Community Water System
A public water supply that has at least 15 service connections or
serves 25 or more persons on a regular basis
Primary Contaminants
Contaminants identify by the EPA as harmful to umal health
Maximum Containment Level (MCL)
The level in which contaminants must not exceed or public
notification is required.
Cryptosporidium
A microscopic parasite that can be found in water. It produces cysts
that are very resistant to harsh environmental conditions. It is
responsible for intestinal illness called cryptosporidiosis. Symptoms
include diarrhea, cramps, gas, bodily discomfort, fatigue, and weight
loss. Occurs one week after exposure and can last for 1-4 weeks
Disinfection Profiling
A water system assesses the level of disinfection currently provided
and then determines the impact a proposed change in disinfection
practice would have.
E. coli
, A bacterium that is commonly used as an indicator of human health
risk from harmful microorganisms that can be present in water.
Symptoms include sever cramps and diarrhea. Blood is often seen in
the stool. Symptoms begin 1-9 days after exposure and last a week or
less.
Giardia
A microscopic parasite that can be found in water. It produces cysts
that are resistant to harsh environmental conditions. Giardia causes
intestinal illness called giardiasis. Symptoms similar to
cryptosporidiosis. Vomiting, chills, headache and fever may also
occur. Symptoms begin one week after exposure and can last up to a
month.
Hard Water
A characteristic of water caused mainly by the salts of calcium (Ca++)
and magnesium (Mg++). Undesirable due to formation of soap curds,
increase use of soap, and scale deposits in boilers and water heaters.
Defines as having hardness of 100mg/L or greater
Maximum Residual Disinfectant Level (MDRLs)
The highest level of disinfectant allowed in drinking water. Standards
set by the US EPA
Microbial Pathogens
Micro-organisms that cause disease
Safe Drinking Water Act (SDWA)
An Act passed by the US Congress in 1974. It establishes a
cooperative program among local, state, and federal agencies to
ensure safe drinking water for customers.
Ch 1 - One gallon of water weighs
8.34 pounds
Ch 1- The average domestic water usage per person per day is
usually somewhere in the range of
100-130 gallons
Questions With Correct Detailed
And Verified Solutions Graded A+
(2025-2026 Latest Update)!!!
How many Training Hours and experience for a class D Water
Operator
16 Hours Training and No Experience
How many Training Hours and experience for a class C Water
Operator
36 Hours Training and 1 year Experience
How many Training Hours and experience for a class B Water
Operator
100 Hours Training and 3 years’ Experience (must include 1 year of
hands on experience)
How many Training Hours and experience for a class A Water
Operator
200 Hours Training and 5 years’ Experience (must include 2 years of
hands on experience)
How many Training Hours and experience for a Class C Lab Operator
32 Hours and no experience
How many Training Hours and experience for a Class B Lab Operator
,32 hours of C and 32 hours of B and 6 months experience.
***associate in science can substitute 32hrs of C level training
How many Training Hours and experience for a Class A Lab Operator
32 hours of B and 1 year experience. ***Must include a Bachelor in
science
How many Training Hours and experience for a Class C Distribution
Operator
36hours and 1 year experience
How many Training Hours and experience for a Distribution
Technician
8 hours and no training.
Community Water System
A public water supply that has at least 15 service connections or
serves 25 or more persons on a regular basis
Primary Contaminants
Contaminants identify by the EPA as harmful to umal health
Maximum Containment Level (MCL)
The level in which contaminants must not exceed or public
notification is required.
Cryptosporidium
A microscopic parasite that can be found in water. It produces cysts
that are very resistant to harsh environmental conditions. It is
responsible for intestinal illness called cryptosporidiosis. Symptoms
include diarrhea, cramps, gas, bodily discomfort, fatigue, and weight
loss. Occurs one week after exposure and can last for 1-4 weeks
Disinfection Profiling
A water system assesses the level of disinfection currently provided
and then determines the impact a proposed change in disinfection
practice would have.
E. coli
, A bacterium that is commonly used as an indicator of human health
risk from harmful microorganisms that can be present in water.
Symptoms include sever cramps and diarrhea. Blood is often seen in
the stool. Symptoms begin 1-9 days after exposure and last a week or
less.
Giardia
A microscopic parasite that can be found in water. It produces cysts
that are resistant to harsh environmental conditions. Giardia causes
intestinal illness called giardiasis. Symptoms similar to
cryptosporidiosis. Vomiting, chills, headache and fever may also
occur. Symptoms begin one week after exposure and can last up to a
month.
Hard Water
A characteristic of water caused mainly by the salts of calcium (Ca++)
and magnesium (Mg++). Undesirable due to formation of soap curds,
increase use of soap, and scale deposits in boilers and water heaters.
Defines as having hardness of 100mg/L or greater
Maximum Residual Disinfectant Level (MDRLs)
The highest level of disinfectant allowed in drinking water. Standards
set by the US EPA
Microbial Pathogens
Micro-organisms that cause disease
Safe Drinking Water Act (SDWA)
An Act passed by the US Congress in 1974. It establishes a
cooperative program among local, state, and federal agencies to
ensure safe drinking water for customers.
Ch 1 - One gallon of water weighs
8.34 pounds
Ch 1- The average domestic water usage per person per day is
usually somewhere in the range of
100-130 gallons
