CLASS D WATER
OPERATOR LICENSE
ACTUAL EXAM TCEQ
QUESTIONS AND
CORRECT ANSWERS
2025/2026 GRADED A+ .
,1. T/F In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. ✓✓
CORRECT ANSWER True
2. Water covers approximately of Earth's surface. ✓✓ CORRECT ANSWER 71%
3. Drought is an extended period when a region receives a deficiency in its
water supply. ✓✓ CORRECT ANSWER atmospheric, ground, or surface
4. T/F Only about 1 gallon of tap water per person/day is used for drinking and cooking ✓✓ CORRECT
ANSWER True
5. Excluding outside water use, the average household uses about gal-
lons of water per month for inside use ✓✓ CORRECT ANSWER 2,000
6. T/F Only 3% of all the fresh water on earth can be easily accessed for use. ✓✓ CORRECT ANSWER False (only 1%)
7. T/F In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the
EPA. ✓✓ CORRECT ANSWER True
8. T/F PWS officials should be pro-active in their approach to terrorism. ✓✓ CORRECT ANSWER True
9. permits the owner of a well to pump as much water as desired, even if the water is drained from
beneath the land of others. ✓✓ CORRECT ANSWER Ruleof Capture
10. In Texas, agricultural water demand accounts for about % of the total water
used. ✓✓ CORRECT ANSWER 57%
11. T/F An example of a non-transient non-community PWS is a rural school. ✓✓ CORRECT ANSWER True
12. Monitoring average and maximum daily water enables us to plan ahead
for growth. ✓✓ CORRECT ANSWER Demand
13. T/F ✓✓ CORRECT ANSWER The Safe Drinking Water Act sets standards for drinking water including
physical, chemical, bacteriological, and radiological characteristics. ✓✓ CORRECT ANSWER True
14. "Potable" means water is safe to drink and has a measurable chlorine
. ✓✓ CORRECT ANSWER Residual
15. The plant operator is responsible for a sufficient supply of safe and
drinking water. ✓✓ CORRECT ANSWER Palatable
16. T/F The Texas State Board of Fire Insurance requires utilities that provide fire protection to have a minimum amount
of water available based on 30 gals per person per day. ✓✓ CORRECT ANSWER False (130 gals per person per day)
17. T/F The primary state regulator of water utilities is the TCEQ. ✓✓ CORRECT ANSWER True
, 18. T/F ✓✓ CORRECT ANSWER All community and non-transient non-community PWS, regardless of
source of water, must be under the supervision of a licensed water works operator. ✓✓ CORRECT ANSWER
True
19. Meter readers bring in operating revenue and profoundly impact rela-
tions. ✓✓ CORRECT ANSWER Public
20. The federal regulator of drinking water is the . ✓✓ CORRECT ANSWER EPA
21. T/F ✓✓ CORRECT ANSWER Duties of distribution operator include repairing leaks, making taps, flushing
mains, and taking radiological samples. ✓✓ CORRECT ANSWER False(Repairleaks,Make taps,Flush mains, Operate pumps, Take
*bacteriological* samples)
22. A service area has 1000 service connections. What can we estimate the population of this service area to be?
✓✓ CORRECT ANSWER 3,000 (multiply connections x 3)
23. T/F ✓✓ CORRECT ANSWER The State must be notified after an existing facility is changed or after
construction of a new facility. ✓✓ CORRECT ANSWER False (must notify *before*)
24. T/F ✓✓ CORRECT ANSWER A Class "D" license is valid for 2 years at ground and purchase water
systems with 250 connections or less. ✓✓ CORRECT ANSWER False (3 years)
25. T/F ✓✓ CORRECT ANSWER The physical characteristics of water are color, taste, odor, temperature, and
turbidity. ✓✓ CORRECT ANSWER True
26. An alkaline or basic solution has a pH greater than . ✓✓ CORRECT ANSWER 7
27. T/F ✓✓ CORRECT ANSWER The terms mg/L and ppm are not interchangeable. ✓✓ CORRECT ANSWER False(they
areinterchange- able)
28. Suspended solids in water cannot be filtered out. ✓✓ CORRECT ANSWER False(theycan)
29. Solids, water hardness, pH and gases are characteristics. ✓✓ CORRECT ANSWER
Chemical
30. T/F ✓✓ CORRECT ANSWER There are 2 hydrogen atoms and 1 oxygen atom in each water mole- cule.
✓✓ CORRECT ANSWER True
31. T/F ✓✓ CORRECT ANSWER The State recommends a water pH of less than 7 to be maintained at all time. ✓
✓ CORRECT ANSWER False (The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.)
32. T/F ✓✓ CORRECT ANSWER Taste and odor can come from organisms such as vegetation, bacteria, and
OPERATOR LICENSE
ACTUAL EXAM TCEQ
QUESTIONS AND
CORRECT ANSWERS
2025/2026 GRADED A+ .
,1. T/F In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. ✓✓
CORRECT ANSWER True
2. Water covers approximately of Earth's surface. ✓✓ CORRECT ANSWER 71%
3. Drought is an extended period when a region receives a deficiency in its
water supply. ✓✓ CORRECT ANSWER atmospheric, ground, or surface
4. T/F Only about 1 gallon of tap water per person/day is used for drinking and cooking ✓✓ CORRECT
ANSWER True
5. Excluding outside water use, the average household uses about gal-
lons of water per month for inside use ✓✓ CORRECT ANSWER 2,000
6. T/F Only 3% of all the fresh water on earth can be easily accessed for use. ✓✓ CORRECT ANSWER False (only 1%)
7. T/F In 1978, the Texas Department of Health (TDH) assumed primacy over the Safe Drinking Water Act from the
EPA. ✓✓ CORRECT ANSWER True
8. T/F PWS officials should be pro-active in their approach to terrorism. ✓✓ CORRECT ANSWER True
9. permits the owner of a well to pump as much water as desired, even if the water is drained from
beneath the land of others. ✓✓ CORRECT ANSWER Ruleof Capture
10. In Texas, agricultural water demand accounts for about % of the total water
used. ✓✓ CORRECT ANSWER 57%
11. T/F An example of a non-transient non-community PWS is a rural school. ✓✓ CORRECT ANSWER True
12. Monitoring average and maximum daily water enables us to plan ahead
for growth. ✓✓ CORRECT ANSWER Demand
13. T/F ✓✓ CORRECT ANSWER The Safe Drinking Water Act sets standards for drinking water including
physical, chemical, bacteriological, and radiological characteristics. ✓✓ CORRECT ANSWER True
14. "Potable" means water is safe to drink and has a measurable chlorine
. ✓✓ CORRECT ANSWER Residual
15. The plant operator is responsible for a sufficient supply of safe and
drinking water. ✓✓ CORRECT ANSWER Palatable
16. T/F The Texas State Board of Fire Insurance requires utilities that provide fire protection to have a minimum amount
of water available based on 30 gals per person per day. ✓✓ CORRECT ANSWER False (130 gals per person per day)
17. T/F The primary state regulator of water utilities is the TCEQ. ✓✓ CORRECT ANSWER True
, 18. T/F ✓✓ CORRECT ANSWER All community and non-transient non-community PWS, regardless of
source of water, must be under the supervision of a licensed water works operator. ✓✓ CORRECT ANSWER
True
19. Meter readers bring in operating revenue and profoundly impact rela-
tions. ✓✓ CORRECT ANSWER Public
20. The federal regulator of drinking water is the . ✓✓ CORRECT ANSWER EPA
21. T/F ✓✓ CORRECT ANSWER Duties of distribution operator include repairing leaks, making taps, flushing
mains, and taking radiological samples. ✓✓ CORRECT ANSWER False(Repairleaks,Make taps,Flush mains, Operate pumps, Take
*bacteriological* samples)
22. A service area has 1000 service connections. What can we estimate the population of this service area to be?
✓✓ CORRECT ANSWER 3,000 (multiply connections x 3)
23. T/F ✓✓ CORRECT ANSWER The State must be notified after an existing facility is changed or after
construction of a new facility. ✓✓ CORRECT ANSWER False (must notify *before*)
24. T/F ✓✓ CORRECT ANSWER A Class "D" license is valid for 2 years at ground and purchase water
systems with 250 connections or less. ✓✓ CORRECT ANSWER False (3 years)
25. T/F ✓✓ CORRECT ANSWER The physical characteristics of water are color, taste, odor, temperature, and
turbidity. ✓✓ CORRECT ANSWER True
26. An alkaline or basic solution has a pH greater than . ✓✓ CORRECT ANSWER 7
27. T/F ✓✓ CORRECT ANSWER The terms mg/L and ppm are not interchangeable. ✓✓ CORRECT ANSWER False(they
areinterchange- able)
28. Suspended solids in water cannot be filtered out. ✓✓ CORRECT ANSWER False(theycan)
29. Solids, water hardness, pH and gases are characteristics. ✓✓ CORRECT ANSWER
Chemical
30. T/F ✓✓ CORRECT ANSWER There are 2 hydrogen atoms and 1 oxygen atom in each water mole- cule.
✓✓ CORRECT ANSWER True
31. T/F ✓✓ CORRECT ANSWER The State recommends a water pH of less than 7 to be maintained at all time. ✓
✓ CORRECT ANSWER False (The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.)
32. T/F ✓✓ CORRECT ANSWER Taste and odor can come from organisms such as vegetation, bacteria, and
