Arizona CR-6 Swimming Pool Service & Repair
Contractor Exam – 200+ Practice Questions &
Answers
Below is a comprehensive test bank for the Arizona CR-6 Swimming Pool Service
and Repair Contractor Exam. This guide covers the exam scope, key topics, and
200+ practice questions with verified answers and rationales.
PART 1: EXAM OVERVIEW & SCOPE
CR-6 License Details
| Feature | Detail |
|:|:|
| License Type | CR-6 Swimming Pool Service & Repair (Residential) |
| Regulatory Agency | Arizona Registrar of Contractors (ROC) |
| Renewal | Biennially (every 2 years) |
| Exam Length | Typically 30 questions in 75 minutes |
| Scope | Service and minor repair of residential pools and accessories |
CR-6 License Scope
1
,The Arizona CR-6 classification allows service and minor repair of residential
pools and accessories, including :
- Included: Pool circulation, filtration, maintenance, operation, water chemistry,
safety, equipment service, minor repair, pool accessories, and service procedures
- Excluded: Certain plumbing, gas, gas chlorine, electrical work, full replacement
of plaster or pebble pool interiors, and decks
Key Regulatory Requirements
| Requirement | Details |
|:|:|
| Pool Barrier Height | Minimum 4 feet with self-closing, self-latching gates |
| Gate Latch Height | 54 inches on pool side or inaccessible to small children |
| Fence Openings | Maximum 4 inches to prevent children from passing through |
| VGB Act | Anti-entrapment drain covers required on all pools |
| Drain Cover Lifespan | 3-7 years; replace sooner in Arizona's high UV index |
PART 2: WATER CHEMISTRY (Questions 1-40)
Q1. What is the ideal pH range for a residential swimming pool?
2
,A) 6.0-7.0
B) 7.2-7.6
C) 8.0-8.5
D) 9.0-9.5
Answer: B
Rationale: A pH of 7.2-7.6 optimizes chlorine effectiveness and protects pool
surfaces from corrosion and scaling .
Q2. If Total Alkalinity (TA) is measured at 40 ppm, what corrective action is
recommended?
A) Add muriatic acid to lower TA
B) Add sodium bicarbonate to raise TA
C) Increase calcium hardness to 400 ppm
D) Add cyanuric acid to stabilize chlorine
Answer: B
3
, Rationale: Low TA (ideal 80-120 ppm) is raised with sodium bicarbonate, which
acts as a pH buffer .
Q3. What is the primary purpose of cyanuric acid in outdoor pool water?
A) To act as a pH buffer
B) To stabilize chlorine from UV degradation
C) To increase calcium hardness
D) To neutralize chloramines
Answer: B
Rationale: Cyanuric acid acts as a stabilizer that protects chlorine from rapid
degradation caused by sunlight, extending its effectiveness in outdoor pools .
Q4. How does increasing pH affect chlorine efficacy?
4
Contractor Exam – 200+ Practice Questions &
Answers
Below is a comprehensive test bank for the Arizona CR-6 Swimming Pool Service
and Repair Contractor Exam. This guide covers the exam scope, key topics, and
200+ practice questions with verified answers and rationales.
PART 1: EXAM OVERVIEW & SCOPE
CR-6 License Details
| Feature | Detail |
|:|:|
| License Type | CR-6 Swimming Pool Service & Repair (Residential) |
| Regulatory Agency | Arizona Registrar of Contractors (ROC) |
| Renewal | Biennially (every 2 years) |
| Exam Length | Typically 30 questions in 75 minutes |
| Scope | Service and minor repair of residential pools and accessories |
CR-6 License Scope
1
,The Arizona CR-6 classification allows service and minor repair of residential
pools and accessories, including :
- Included: Pool circulation, filtration, maintenance, operation, water chemistry,
safety, equipment service, minor repair, pool accessories, and service procedures
- Excluded: Certain plumbing, gas, gas chlorine, electrical work, full replacement
of plaster or pebble pool interiors, and decks
Key Regulatory Requirements
| Requirement | Details |
|:|:|
| Pool Barrier Height | Minimum 4 feet with self-closing, self-latching gates |
| Gate Latch Height | 54 inches on pool side or inaccessible to small children |
| Fence Openings | Maximum 4 inches to prevent children from passing through |
| VGB Act | Anti-entrapment drain covers required on all pools |
| Drain Cover Lifespan | 3-7 years; replace sooner in Arizona's high UV index |
PART 2: WATER CHEMISTRY (Questions 1-40)
Q1. What is the ideal pH range for a residential swimming pool?
2
,A) 6.0-7.0
B) 7.2-7.6
C) 8.0-8.5
D) 9.0-9.5
Answer: B
Rationale: A pH of 7.2-7.6 optimizes chlorine effectiveness and protects pool
surfaces from corrosion and scaling .
Q2. If Total Alkalinity (TA) is measured at 40 ppm, what corrective action is
recommended?
A) Add muriatic acid to lower TA
B) Add sodium bicarbonate to raise TA
C) Increase calcium hardness to 400 ppm
D) Add cyanuric acid to stabilize chlorine
Answer: B
3
, Rationale: Low TA (ideal 80-120 ppm) is raised with sodium bicarbonate, which
acts as a pH buffer .
Q3. What is the primary purpose of cyanuric acid in outdoor pool water?
A) To act as a pH buffer
B) To stabilize chlorine from UV degradation
C) To increase calcium hardness
D) To neutralize chloramines
Answer: B
Rationale: Cyanuric acid acts as a stabilizer that protects chlorine from rapid
degradation caused by sunlight, extending its effectiveness in outdoor pools .
Q4. How does increasing pH affect chlorine efficacy?
4
