AWWA Water Treatment Grade 1 Study
Guide | Class D Water Treatment
Operator Exam Prep 2026/2027
, Coliform Bacteria group Organism(s) that is/are the ideal indicator for pathogenic presence in water:
Inorganic Compounds Acids, bases, and salts lacking carbon are:
Coliform Bacteria The organisms used to indicate the likelihood that pathogenic bacteria may be
present are:
Turbidity A physical property, as opposed to a chemical property, that is important to water
treatment is:
Calcium & Magnesium Two principal chemicals that cause water HARDNESS are:
Viruses Which type of organism is described by:
-Having no independent metabolism and depend on living cells for reproduction.
-Range in diameter from 10-25 nanometers (nm); smaller than can be seen with an
Optical Microscope.
-Able to survive in the environment outside of a host for varying periods of time.
-Some kinds may cause acute epidemics of Gastroenteritis.
Presence of Coliform Bacteria What is commonly used as an indicator of drinking water quality?
Atom The smallest particle that retains the characteristics of the element that it forms is
known as an:
Radical A group of elements that bond together and act like single atoms or ions in forming
compounds is known as a:
mg/L or grains per gallon (gpg) Two measurements that are used to express the WEIGHT of a Solute dissolved in a
given VOLUME of a solution are:
15, 755 gpm (R: 15,800 gpm) Convert 35.1 CFS to gpm:
11.9 CFS (R: 12 CFS) Convert 7.7 MGD to CFS:
103.6 million gallons (R: 104 MG) How many million gallons are there in 308 acre-feet?
2.2% Soda Ash slurry If 8.25lbs of Soda Ash are mixed into 45gal of water, what is the percentage of Soda
Ash in the slurry?
Guide | Class D Water Treatment
Operator Exam Prep 2026/2027
, Coliform Bacteria group Organism(s) that is/are the ideal indicator for pathogenic presence in water:
Inorganic Compounds Acids, bases, and salts lacking carbon are:
Coliform Bacteria The organisms used to indicate the likelihood that pathogenic bacteria may be
present are:
Turbidity A physical property, as opposed to a chemical property, that is important to water
treatment is:
Calcium & Magnesium Two principal chemicals that cause water HARDNESS are:
Viruses Which type of organism is described by:
-Having no independent metabolism and depend on living cells for reproduction.
-Range in diameter from 10-25 nanometers (nm); smaller than can be seen with an
Optical Microscope.
-Able to survive in the environment outside of a host for varying periods of time.
-Some kinds may cause acute epidemics of Gastroenteritis.
Presence of Coliform Bacteria What is commonly used as an indicator of drinking water quality?
Atom The smallest particle that retains the characteristics of the element that it forms is
known as an:
Radical A group of elements that bond together and act like single atoms or ions in forming
compounds is known as a:
mg/L or grains per gallon (gpg) Two measurements that are used to express the WEIGHT of a Solute dissolved in a
given VOLUME of a solution are:
15, 755 gpm (R: 15,800 gpm) Convert 35.1 CFS to gpm:
11.9 CFS (R: 12 CFS) Convert 7.7 MGD to CFS:
103.6 million gallons (R: 104 MG) How many million gallons are there in 308 acre-feet?
2.2% Soda Ash slurry If 8.25lbs of Soda Ash are mixed into 45gal of water, what is the percentage of Soda
Ash in the slurry?
