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ADWR Arizona (AZ) CR-53 (Dual Commercial/Residential)
License Examination | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the Arizona CR-53
(Dual Water Well Drilling) License Examination, administered by the Arizona Department
of Water Resources (ADWR). The exam is computer-based, open-book, and assesses a
candidate's technical proficiency across the full scope of water well drilling, construction,
repair, and servicing for both residential and commercial applications. Content areas
include well construction and drilling methods, hydrology and geology, pumps and
controls, well maintenance and troubleshooting, and Arizona-specific regulations and
safety requirements drawn from ADWR rules, Arizona Revised Statutes, and OSHA
standards, with heavy reliance on guidelines from the National Ground Water Association.
QUESTION 1
What is the minimum depth for the annular seal (sanitary seal) in a water well when
drilling through unconsolidated formations, according to Arizona Department of Water
Resources (ADWR) rules?
A) 10 feet below land surface
B) 20 feet below land surface
C) 50 feet below land surface
D) 100 feet below land surface
CORRECT ANSWER: C
EXPERT RATIONALE: ADWR requires a minimum of 50 feet of continuous annular seal in
unconsolidated material to prevent contamination. Consolidated rock has different
minimum depths (20 feet unless overlying unconsolidated).
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QUESTION 2
Which drilling method is generally best suited for rapidly advancing through hard,
consolidated rock formations such as granite?
A) Cable tool
B) Hollow‑stem auger
C) Direct mud rotary
D) Down‑the‑hole air percussion
CORRECT ANSWER: D
EXPERT RATIONALE: DTH air percussion hammers deliver high‑frequency impacts
directly on the bit, making them extremely efficient in hard rock. Mud rotary and cable
tool are slower in crystalline rocks.
QUESTION 3
During gravel pack placement, what is the primary purpose of a “tremie pipe”?
A) To measure water level inside the casing
B) To introduce grout from the bottom up
C) To place gravel pack uniformly without bridging from the bottom of the annular
space upward
D) To develop the well by airlifting
CORRECT ANSWER: C
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EXPERT RATIONALE: A tremie pipe fills the annulus from the bottom up, minimizing
segregation and bridging of gravel pack material. It ensures a continuous, even
envelope around the screen.
QUESTION 4
According to NGWA guidelines, what is the minimum diameter difference between the
borehole and the well casing to allow an effective gravel pack of at least 3 inches
thickness?
A) 4 inches
B) 6 inches
C) 8 inches
D) 10 inches
CORRECT ANSWER: B
EXPERT RATIONALE: A minimum 3‑inch gravel pack requires a borehole at least 6 inches
larger than the casing outside diameter. This allows uniform placement and proper
filtering.
QUESTION 5
Which ADWR well construction standard applies to the minimum concrete pad thickness
required around a water well in a flood‑prone area?
A) 2 inches thick, sloped away
B) 4 inches thick, extending 2 feet from the casing
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C) 6 inches thick, extending 3 feet from the casing, and 2 inches above ground
D) No pad required if the annular seal is grouted
CORRECT ANSWER: C
EXPERT RATIONALE: ADWR rules for flood‑prone areas mandate a reinforced concrete
pad at least 6 inches thick, extending 3 feet from the casing edge, with the top 2 inches
above finished grade.
QUESTION 6
Which A.R.S. Title 45 provision requires a driller to notify ADWR at least 48 hours before
commencing a new well?
A) A.R.S. §45‑834.01
B) A.R.S. §45‑595
C) A.R.S. §45‑596
D) A.R.S. §45‑593
CORRECT ANSWER: D
EXPERT RATIONALE: A.R.S. §45‑593 requires a notice of intent to drill be filed and
acknowledged by the Director at least 48 hours prior to beginning construction, unless
emergency provisions apply.
QUESTION 7
In reverse‑circulation drilling, the drilling fluid and cuttings travel up through the:
A) Annulus between drill pipe and borehole
ADWR Arizona (AZ) CR-53 (Dual Commercial/Residential)
License Examination | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION:
This comprehensive set of multiple-choice questions is designed for the Arizona CR-53
(Dual Water Well Drilling) License Examination, administered by the Arizona Department
of Water Resources (ADWR). The exam is computer-based, open-book, and assesses a
candidate's technical proficiency across the full scope of water well drilling, construction,
repair, and servicing for both residential and commercial applications. Content areas
include well construction and drilling methods, hydrology and geology, pumps and
controls, well maintenance and troubleshooting, and Arizona-specific regulations and
safety requirements drawn from ADWR rules, Arizona Revised Statutes, and OSHA
standards, with heavy reliance on guidelines from the National Ground Water Association.
QUESTION 1
What is the minimum depth for the annular seal (sanitary seal) in a water well when
drilling through unconsolidated formations, according to Arizona Department of Water
Resources (ADWR) rules?
A) 10 feet below land surface
B) 20 feet below land surface
C) 50 feet below land surface
D) 100 feet below land surface
CORRECT ANSWER: C
EXPERT RATIONALE: ADWR requires a minimum of 50 feet of continuous annular seal in
unconsolidated material to prevent contamination. Consolidated rock has different
minimum depths (20 feet unless overlying unconsolidated).
,2|Page
QUESTION 2
Which drilling method is generally best suited for rapidly advancing through hard,
consolidated rock formations such as granite?
A) Cable tool
B) Hollow‑stem auger
C) Direct mud rotary
D) Down‑the‑hole air percussion
CORRECT ANSWER: D
EXPERT RATIONALE: DTH air percussion hammers deliver high‑frequency impacts
directly on the bit, making them extremely efficient in hard rock. Mud rotary and cable
tool are slower in crystalline rocks.
QUESTION 3
During gravel pack placement, what is the primary purpose of a “tremie pipe”?
A) To measure water level inside the casing
B) To introduce grout from the bottom up
C) To place gravel pack uniformly without bridging from the bottom of the annular
space upward
D) To develop the well by airlifting
CORRECT ANSWER: C
,3|Page
EXPERT RATIONALE: A tremie pipe fills the annulus from the bottom up, minimizing
segregation and bridging of gravel pack material. It ensures a continuous, even
envelope around the screen.
QUESTION 4
According to NGWA guidelines, what is the minimum diameter difference between the
borehole and the well casing to allow an effective gravel pack of at least 3 inches
thickness?
A) 4 inches
B) 6 inches
C) 8 inches
D) 10 inches
CORRECT ANSWER: B
EXPERT RATIONALE: A minimum 3‑inch gravel pack requires a borehole at least 6 inches
larger than the casing outside diameter. This allows uniform placement and proper
filtering.
QUESTION 5
Which ADWR well construction standard applies to the minimum concrete pad thickness
required around a water well in a flood‑prone area?
A) 2 inches thick, sloped away
B) 4 inches thick, extending 2 feet from the casing
, 4|Page
C) 6 inches thick, extending 3 feet from the casing, and 2 inches above ground
D) No pad required if the annular seal is grouted
CORRECT ANSWER: C
EXPERT RATIONALE: ADWR rules for flood‑prone areas mandate a reinforced concrete
pad at least 6 inches thick, extending 3 feet from the casing edge, with the top 2 inches
above finished grade.
QUESTION 6
Which A.R.S. Title 45 provision requires a driller to notify ADWR at least 48 hours before
commencing a new well?
A) A.R.S. §45‑834.01
B) A.R.S. §45‑595
C) A.R.S. §45‑596
D) A.R.S. §45‑593
CORRECT ANSWER: D
EXPERT RATIONALE: A.R.S. §45‑593 requires a notice of intent to drill be filed and
acknowledged by the Director at least 48 hours prior to beginning construction, unless
emergency provisions apply.
QUESTION 7
In reverse‑circulation drilling, the drilling fluid and cuttings travel up through the:
A) Annulus between drill pipe and borehole
