CA-NV AWWA WATER USE EFFICIENCY
(WUE) GRADE 1] ACTUAL QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
Section 1: Water Supply & Demand Fundamentals
1. What is the primary goal of water use efficiency (WUE) programs?
A) Increase water sales revenue
B) Reduce non-beneficial water use while maintaining benefits
C) Eliminate all outdoor watering
D) Replace all fixtures with the cheapest models
Answer: B
Rationale: WUE focuses on optimizing water use—reducing waste without sacrificing
economic, social, or environmental benefits. It differs from simple conservation, which
may restrict beneficial use .
2. How many gallons are in 1 "Acre-Foot" of water?
A) 748 gallons
B) 325,851 gallons
C) 1,000,000 gallons
D) 43,560 gallons
Answer: B
Rationale: An acre-foot is the volume required to cover one acre of land to a depth of
one foot. It is a standard unit for large-scale water management .
,3. What does "gallons per capita per day" (GPCD) measure?
A) Total water produced divided by population
B) Total residential water use divided by population served
C) Water used in cooling towers
D) Water discharged from treatment plants
Answer: B
Rationale: GPCD is a key performance metric for urban water suppliers, measuring
average daily residential water use per person served .
4. Which California law mandates urban water suppliers to set annual water use
targets?
A) Porter-Cologne Act
B) Sustainable Groundwater Management Act (SGMA)
C) Making Conservation a California Way of Life (SB 606/AB 1668)
D) Clean Water Act
Answer: C
Rationale: SB 606 and AB 1668 (2018) established long-term water use efficiency
standards, including indoor residential use targets .
5. What is "Evapotranspiration" (ET)?
A) Water lost through leaks in the distribution system
B) The sum of evaporation from soil and transpiration from plants
C) The amount of water stored in reservoirs
D) The rate of water flow through a pipe
Answer: B
Rationale: ET is measured in inches per day or week and is the primary driver of
landscape water demand .
,6. "Transpiration" is the process where:
A) Water evaporates from the soil
B) Water is absorbed through the leaves from the air
C) Water vapor is released through the pores (stomata) of a plant's leaves
D) Water turns into ice
Answer: C
Rationale: Transpiration is the "plant sweat" process and is a major component of the
Evapotranspiration (ET) equation .
7. Which soil type has the fastest "Infiltration Rate"?
A) Clay
B) Silt
C) Sand
D) Loam
Answer: C
Rationale: Sandy soil has large particles and large pore spaces, allowing water to soak
in quickly .
8. The Colorado River Compact of 1922 allocates water to which basin states?
A) Only California
B) Upper Basin and Lower Basin states
C) Only Nevada
D) Only Arizona
Answer: B
Rationale: The Compact divides the Colorado River into the Upper Basin (Colorado,
New Mexico, Utah, Wyoming) and Lower Basin (California, Arizona, Nevada) states .
, 9. An acre-foot is the volume required to cover one acre of land to a depth of how
many feet?
A) 1 foot
B) 2 feet
C) 6 inches
D) 10 feet
Answer: A
Rationale: By definition, an acre-foot covers one acre to a depth of one foot .
10. What is the average indoor residential water use target in California as of
2026?
A) 35 GPCD
B) 47 GPCD
C) 55 GPCD
D) 65 GPCD
Answer: B
Rationale: SB 606/AB 1668 set a target of 47 GPCD by 2025 and 42 GPCD by 2030 .
Section 2: Residential Water Conservation & Fixtures
11. A residential toilet labeled 1.28 gpf is installed. What efficiency measure does
this represent?
A) Low-flow fixture
B) Irrigation system control
C) Leak detection tool
D) Water quality sample
(WUE) GRADE 1] ACTUAL QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
Section 1: Water Supply & Demand Fundamentals
1. What is the primary goal of water use efficiency (WUE) programs?
A) Increase water sales revenue
B) Reduce non-beneficial water use while maintaining benefits
C) Eliminate all outdoor watering
D) Replace all fixtures with the cheapest models
Answer: B
Rationale: WUE focuses on optimizing water use—reducing waste without sacrificing
economic, social, or environmental benefits. It differs from simple conservation, which
may restrict beneficial use .
2. How many gallons are in 1 "Acre-Foot" of water?
A) 748 gallons
B) 325,851 gallons
C) 1,000,000 gallons
D) 43,560 gallons
Answer: B
Rationale: An acre-foot is the volume required to cover one acre of land to a depth of
one foot. It is a standard unit for large-scale water management .
,3. What does "gallons per capita per day" (GPCD) measure?
A) Total water produced divided by population
B) Total residential water use divided by population served
C) Water used in cooling towers
D) Water discharged from treatment plants
Answer: B
Rationale: GPCD is a key performance metric for urban water suppliers, measuring
average daily residential water use per person served .
4. Which California law mandates urban water suppliers to set annual water use
targets?
A) Porter-Cologne Act
B) Sustainable Groundwater Management Act (SGMA)
C) Making Conservation a California Way of Life (SB 606/AB 1668)
D) Clean Water Act
Answer: C
Rationale: SB 606 and AB 1668 (2018) established long-term water use efficiency
standards, including indoor residential use targets .
5. What is "Evapotranspiration" (ET)?
A) Water lost through leaks in the distribution system
B) The sum of evaporation from soil and transpiration from plants
C) The amount of water stored in reservoirs
D) The rate of water flow through a pipe
Answer: B
Rationale: ET is measured in inches per day or week and is the primary driver of
landscape water demand .
,6. "Transpiration" is the process where:
A) Water evaporates from the soil
B) Water is absorbed through the leaves from the air
C) Water vapor is released through the pores (stomata) of a plant's leaves
D) Water turns into ice
Answer: C
Rationale: Transpiration is the "plant sweat" process and is a major component of the
Evapotranspiration (ET) equation .
7. Which soil type has the fastest "Infiltration Rate"?
A) Clay
B) Silt
C) Sand
D) Loam
Answer: C
Rationale: Sandy soil has large particles and large pore spaces, allowing water to soak
in quickly .
8. The Colorado River Compact of 1922 allocates water to which basin states?
A) Only California
B) Upper Basin and Lower Basin states
C) Only Nevada
D) Only Arizona
Answer: B
Rationale: The Compact divides the Colorado River into the Upper Basin (Colorado,
New Mexico, Utah, Wyoming) and Lower Basin (California, Arizona, Nevada) states .
, 9. An acre-foot is the volume required to cover one acre of land to a depth of how
many feet?
A) 1 foot
B) 2 feet
C) 6 inches
D) 10 feet
Answer: A
Rationale: By definition, an acre-foot covers one acre to a depth of one foot .
10. What is the average indoor residential water use target in California as of
2026?
A) 35 GPCD
B) 47 GPCD
C) 55 GPCD
D) 65 GPCD
Answer: B
Rationale: SB 606/AB 1668 set a target of 47 GPCD by 2025 and 42 GPCD by 2030 .
Section 2: Residential Water Conservation & Fixtures
11. A residential toilet labeled 1.28 gpf is installed. What efficiency measure does
this represent?
A) Low-flow fixture
B) Irrigation system control
C) Leak detection tool
D) Water quality sample
