Class D Water Operator UPDATED ACTUAL Questions and CORRECT
Answers
1. What are some physical characteristics of wa- Temperature, turbidity, color, taste,
ter? odor
2. What are some chemical characteristics of Hardness, pH, solids, and gases
water?
3. What is turbidity? the amount of suspended matter, such
as clay, silt, organic matter, and mi-
croorganisms in water
4. T/F Water is never found pure in nature. True
5. Is turbidity more of a problem in groundwa- Surface water
ter or surface water?
6. A system's filtered water must be 0.3
Nephelometric Turbidity Units (NTU) or less 1
in at least 95% of the measurements taken
each month, and no sample can exceed
NTU.
7. T/F True color is dissolved in water (in solu- True. Tea in water is an example of true
tion) and cannot be removed by filtering. color.
8. Suspended color is called color. apparent
9. Color above units is objectionable in a 15 units
public water supply.
10. A scale called the measures odor. Threshold Odor Number (TON)
11. Odor greater than a scale of is unde- 3
sirable.
,12. Taste and odors in water result from , algae
bacteria, decaying organic matter, gases, and
chemicals such as manganese, zinc, copper,
iron, magnesium, sodium, and potassium.
13. Chemical characteristics of water generally laboratory analysis
cannot be detected by sight, smell, or taste
and must be determined by .
14. Chemical laboratory analysis must be sam- once/year for surface water
pled per year for surface water and once every three years for groundwater
normally for groundwater.
15. Water weighs lbs/gal. 8.34 lbs/gal
16. T/F True
For water, 1 mg/L is equal to 1 part per million
(ppm) by weight.
17. Which two minerals mainly cause hardness in Calcium and magnesium
water?
18. Is hardness more of a problem in groundwa- Groundwater
ter or surface water?
19. Water is considered hard when it exceeds 100 mg/L of calcium carbonate
.
20. The pH scale ranges from to . 0 to 14
21. On the pH scale: Acidic
0 to <7 is . Neutral
7 is . Basic or alkaline
>7 to 14 is .
, 22. Sulfuric, hydrochloric, and nitric acids can be Lower
used to pH. Raise
Caustic, lime, or soda ash can be used to
pH.
23. Suspended solids can be removed by Filtration
.
24. Can dissolved solids be removed by filtration? No
25. Total dissolved solids should not ex- 1000 mg/L
ceed .
26. What are three common gasses found in wa- Hydrogen sulfide, carbon dioxide, and
ter? methane
27. Excess can cause blue baby syn- Nitrogen or Nitrates
drome.
28. What is the major source of nitrogen into Fertilizer and animal waste carried by
drinking water? rainwater runoff
29. What is the EPA primary MCL (maximum con- 4.0 mg/L
taminant level) for fluoride?
30. At what level will fluoride cause mottling of 4.0 mg/L
teeth, a condition known as fluorosis?
31. What is the state of Texas secondary standard 2.0 mg/L
for fluoride?
32. chlorination
Answers
1. What are some physical characteristics of wa- Temperature, turbidity, color, taste,
ter? odor
2. What are some chemical characteristics of Hardness, pH, solids, and gases
water?
3. What is turbidity? the amount of suspended matter, such
as clay, silt, organic matter, and mi-
croorganisms in water
4. T/F Water is never found pure in nature. True
5. Is turbidity more of a problem in groundwa- Surface water
ter or surface water?
6. A system's filtered water must be 0.3
Nephelometric Turbidity Units (NTU) or less 1
in at least 95% of the measurements taken
each month, and no sample can exceed
NTU.
7. T/F True color is dissolved in water (in solu- True. Tea in water is an example of true
tion) and cannot be removed by filtering. color.
8. Suspended color is called color. apparent
9. Color above units is objectionable in a 15 units
public water supply.
10. A scale called the measures odor. Threshold Odor Number (TON)
11. Odor greater than a scale of is unde- 3
sirable.
,12. Taste and odors in water result from , algae
bacteria, decaying organic matter, gases, and
chemicals such as manganese, zinc, copper,
iron, magnesium, sodium, and potassium.
13. Chemical characteristics of water generally laboratory analysis
cannot be detected by sight, smell, or taste
and must be determined by .
14. Chemical laboratory analysis must be sam- once/year for surface water
pled per year for surface water and once every three years for groundwater
normally for groundwater.
15. Water weighs lbs/gal. 8.34 lbs/gal
16. T/F True
For water, 1 mg/L is equal to 1 part per million
(ppm) by weight.
17. Which two minerals mainly cause hardness in Calcium and magnesium
water?
18. Is hardness more of a problem in groundwa- Groundwater
ter or surface water?
19. Water is considered hard when it exceeds 100 mg/L of calcium carbonate
.
20. The pH scale ranges from to . 0 to 14
21. On the pH scale: Acidic
0 to <7 is . Neutral
7 is . Basic or alkaline
>7 to 14 is .
, 22. Sulfuric, hydrochloric, and nitric acids can be Lower
used to pH. Raise
Caustic, lime, or soda ash can be used to
pH.
23. Suspended solids can be removed by Filtration
.
24. Can dissolved solids be removed by filtration? No
25. Total dissolved solids should not ex- 1000 mg/L
ceed .
26. What are three common gasses found in wa- Hydrogen sulfide, carbon dioxide, and
ter? methane
27. Excess can cause blue baby syn- Nitrogen or Nitrates
drome.
28. What is the major source of nitrogen into Fertilizer and animal waste carried by
drinking water? rainwater runoff
29. What is the EPA primary MCL (maximum con- 4.0 mg/L
taminant level) for fluoride?
30. At what level will fluoride cause mottling of 4.0 mg/L
teeth, a condition known as fluorosis?
31. What is the state of Texas secondary standard 2.0 mg/L
for fluoride?
32. chlorination
