https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification Practice Questions and Answershttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupachttps://www.stuvia.com/usehttps://www.stuvia.com/user/
edupacr/edupac
California Grade 1 Water
Treatment Operator
Certification Practice
Questions and Answers
https://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupachttps://www.stuvia.com/uhttps://www.stuvia.com/user/
edupacser/edupac
https://www.stuvia.com/user/edupacPage 1 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
, https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certificationhttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification
Study online at https://quizlet.com/_hmfe4w
1. What is one reason the chlorine demand would sud- A contaminant entered the
denly increase from 0.7 to 3.2 mg/L while treating raw aquifer
water from a well?
2. How will a decrease in water temperature affect the The disinfection is less ef-
disinfecting action of chlorine? fective
3. Examples of protozoa that must be removed from Giardia and Cryptosporid-
drinking water to protect public health ium
4. How is water prevented from entering a gas chlorina- A check valve
tor?
5. Of the following characteristics of raw water, the least physical
likely to cause health issues in consumers is ______?
6. What is the never-ending transmission of water from The Hydrologic Cycle
the Earth into the atmosphere and back again?
7. What fraction of the earth surface is covered with Three-Quarters (3/4)
water?
8. What is the process by which water becomes a gas and Evaporation
rises?
9. To deliberately form chloramines, a water supplier Ammonia (ammonia +
mixes chlorine gas with _____? chlorine = chloramines)
10. To remove a calcium scale deposit from the liquid A weak solution of hy-
head of a chemical feed pump, remove it, then soak drochloric acid
it in_____?
11. Why is turbidity in drinking water is considered unde- Because it necessi-
sirable? tates extensive treatment
https://www.stuvia.com/user/edupacPage 2 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
, https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certificationhttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification
Study online at https://quizlet.com/_hmfe4w
and produces greater
amounts of sludge
12. What does HTH (high test hypochlorite), a dry white 65 to 70% chlorine
granular compound, contain?
13. What is a non-halogenic oxidizing chemical that may Potassium Permanganate
be substituted for pre-chlorination to avoid formation
of DBP's?
14. Which of the following forms the strongest disinfec- Dichloramines
tant in solution?
15. The Colilert Method can detect the presence of both 18 to 24 hours
total and fecal coliforms after how many hours of
incubation?
16. At what temperature is a fusible plug on a chlorine 158 to 165°F
cylinder designed to melt and release chlorine gas?
17. What alternative disinfectant is most commonly used Ozone (oxygen)
to avoid the formation of THM's (trihalomethanes) at
larger water treatment plants?
18. What are the nutrients in water taken up by algae carbon, nitrates, and am-
during sunlight periods? monia
19. What is the moisture passing from trees and other Evapotranspiration
plants into the atmosphere referred to as?
20. What is capillary fringe? The porous material just
above the water table
which holds small quan-
https://www.stuvia.com/user/edupacPage 3 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
, https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certificationhttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification
Study online at https://quizlet.com/_hmfe4w
tities of water by capillary
action
21. What is the ground water table? The upper surface of
the zone of saturation of
groundwater in a confined
aquifer
22. Where can pure water be found? A laboratory
23. What is described as the universal solvent? Water
24. What primary sources of water do the hydrologic cy- Ground and Surface Wa-
cles create? ter
25. What is red water usually caused by? Iron
26. What forms in the mixing of precipitation and certain Acid Rain
gases in the atmosphere?
27. Raw water sources that eventually serve the public are True
greater in the amount of surface water used.
28. While pumping from Well #1, the static level of Well #2 An overlapping field of in-
drops. What is this condition called? fluence
29. When should the minimum number of bacteriological by the end of the first week
samples be collected? in the month
30. What does a positive sample require an operator to re-sample at the same site
do? where the positive sample
was resulted
31. Weight
https://www.stuvia.com/user/edupacPage 4 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification Practice Questions and Answershttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupachttps://www.stuvia.com/usehttps://www.stuvia.com/user/
edupacr/edupac
California Grade 1 Water
Treatment Operator
Certification Practice
Questions and Answers
https://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupachttps://www.stuvia.com/uhttps://www.stuvia.com/user/
edupacser/edupac
https://www.stuvia.com/user/edupacPage 1 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
, https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certificationhttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification
Study online at https://quizlet.com/_hmfe4w
1. What is one reason the chlorine demand would sud- A contaminant entered the
denly increase from 0.7 to 3.2 mg/L while treating raw aquifer
water from a well?
2. How will a decrease in water temperature affect the The disinfection is less ef-
disinfecting action of chlorine? fective
3. Examples of protozoa that must be removed from Giardia and Cryptosporid-
drinking water to protect public health ium
4. How is water prevented from entering a gas chlorina- A check valve
tor?
5. Of the following characteristics of raw water, the least physical
likely to cause health issues in consumers is ______?
6. What is the never-ending transmission of water from The Hydrologic Cycle
the Earth into the atmosphere and back again?
7. What fraction of the earth surface is covered with Three-Quarters (3/4)
water?
8. What is the process by which water becomes a gas and Evaporation
rises?
9. To deliberately form chloramines, a water supplier Ammonia (ammonia +
mixes chlorine gas with _____? chlorine = chloramines)
10. To remove a calcium scale deposit from the liquid A weak solution of hy-
head of a chemical feed pump, remove it, then soak drochloric acid
it in_____?
11. Why is turbidity in drinking water is considered unde- Because it necessi-
sirable? tates extensive treatment
https://www.stuvia.com/user/edupacPage 2 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
, https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certificationhttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification
Study online at https://quizlet.com/_hmfe4w
and produces greater
amounts of sludge
12. What does HTH (high test hypochlorite), a dry white 65 to 70% chlorine
granular compound, contain?
13. What is a non-halogenic oxidizing chemical that may Potassium Permanganate
be substituted for pre-chlorination to avoid formation
of DBP's?
14. Which of the following forms the strongest disinfec- Dichloramines
tant in solution?
15. The Colilert Method can detect the presence of both 18 to 24 hours
total and fecal coliforms after how many hours of
incubation?
16. At what temperature is a fusible plug on a chlorine 158 to 165°F
cylinder designed to melt and release chlorine gas?
17. What alternative disinfectant is most commonly used Ozone (oxygen)
to avoid the formation of THM's (trihalomethanes) at
larger water treatment plants?
18. What are the nutrients in water taken up by algae carbon, nitrates, and am-
during sunlight periods? monia
19. What is the moisture passing from trees and other Evapotranspiration
plants into the atmosphere referred to as?
20. What is capillary fringe? The porous material just
above the water table
which holds small quan-
https://www.stuvia.com/user/edupacPage 3 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
, https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certificationhttps://www.stuvia.com/user/edupac
https://www.stuvia.com/user/edupac
California Grade 1 Water Treatment Operator Certification
Study online at https://quizlet.com/_hmfe4w
tities of water by capillary
action
21. What is the ground water table? The upper surface of
the zone of saturation of
groundwater in a confined
aquifer
22. Where can pure water be found? A laboratory
23. What is described as the universal solvent? Water
24. What primary sources of water do the hydrologic cy- Ground and Surface Wa-
cles create? ter
25. What is red water usually caused by? Iron
26. What forms in the mixing of precipitation and certain Acid Rain
gases in the atmosphere?
27. Raw water sources that eventually serve the public are True
greater in the amount of surface water used.
28. While pumping from Well #1, the static level of Well #2 An overlapping field of in-
drops. What is this condition called? fluence
29. When should the minimum number of bacteriological by the end of the first week
samples be collected? in the month
30. What does a positive sample require an operator to re-sample at the same site
do? where the positive sample
was resulted
31. Weight
https://www.stuvia.com/user/edupacPage 4 of 18 https://www.stuvia.com/user/edupac 7/4/2026, 8:44:31 AMhttps://www.stuvia.com/user/edupac
