CLASS D WATER OPERATOR LICENSE
EXAM TEST BANK / 400 + COMPLETE
QUESTIONS AND VERIFIED
SOLUTIONS LATEST GUIDE 2025/2026.
,1. T/F CORRECT ANSWER 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 CORRECT ANSWER 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
gallons of water per month for inside use CORRECT ANSWER 2,000
6. T/F CORRECT ANSWER Only 3% of all the fresh water on earth can be easily accessed for use.
CORRECT ANSWER False (only 1%)
7. T/F CORRECT ANSWER 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 CORRECT ANSWER 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 Rule of Capture
10. In Texas, agricultural water demand accounts for about % of the total
water used. CORRECT ANSWER 57%
11. T/F CORRECT ANSWER 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 includ- ing
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 CORRECT ANSWER 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 CORRECT ANSWER The primary state regulator of water utilities is the TCEQ. CORRECT ANSW
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
relations. 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 (Repair leaks, 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, tempera- ture, 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
EXAM TEST BANK / 400 + COMPLETE
QUESTIONS AND VERIFIED
SOLUTIONS LATEST GUIDE 2025/2026.
,1. T/F CORRECT ANSWER 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 CORRECT ANSWER 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
gallons of water per month for inside use CORRECT ANSWER 2,000
6. T/F CORRECT ANSWER Only 3% of all the fresh water on earth can be easily accessed for use.
CORRECT ANSWER False (only 1%)
7. T/F CORRECT ANSWER 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 CORRECT ANSWER 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 Rule of Capture
10. In Texas, agricultural water demand accounts for about % of the total
water used. CORRECT ANSWER 57%
11. T/F CORRECT ANSWER 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 includ- ing
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 CORRECT ANSWER 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 CORRECT ANSWER The primary state regulator of water utilities is the TCEQ. CORRECT ANSW
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
relations. 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 (Repair leaks, 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, tempera- ture, 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
