Master Plumber Exam Administration, Codes, and Regulations 4

Question 1

Which federal agency regulates lead content in plumbing materials used in public water systems under the Safe Drinking Water Act?

Accepted Answer

EPA

Answer

The EPA enforces the Safe Drinking Water Act, including the Reduction of Lead in Drinking Water Act limiting lead in plumbing products.

Question 2

Under the 2021 IPC, what is the maximum allowable lead content by weighted average for solder and flux used in potable water systems?

Accepted Answer

0.25%

Answer

Federal law and the IPC limit lead content in solder and flux to no more than 0.25% by weighted average for potable water systems.

Question 3

Which plumbing code standard governs water supply fixture units (WSFU) used to size water distribution systems?

Accepted Answer

IPC Table 604.3

Answer

IPC Table 604.3 provides the water supply fixture unit values used to calculate demand loads for sizing water supply piping.

Question 4

A master plumber takes on an apprentice who performs work unsupervised and causes property damage. Who bears primary liability?

Accepted Answer

The master plumber who is responsible for supervision

Answer

The master plumber is legally responsible for supervising and is liable for work performed under their license.

Question 5

Under the IPC, what must be done with all plumbing systems before a certificate of occupancy is issued?

Accepted Answer

Tested, inspected, and approved by the AHJ

Answer

All plumbing systems must pass all required tests and inspections and receive AHJ approval before occupancy is permitted.

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