Plumber Interview Questions and Answers


A plumber installs, maintains, and repairs pipes and fixtures associated with heating, cooling, water distribution, and sanitation systems in homes and commercial facilities.

While hiring a plumber, employers look for individuals who have theoretical knowledge and who respect safety precautions, work well in teams and have a good problem-solving attitude. Requirements will vary depending on whether you’re hiring for an apprentice, a journeyman or a master plumber. If you are being hired as an apprentice or by a company that sends out plumbers for residential support, then the interview questions aimed at you will be easy. With other candidates, questions are asked to determine their level of technical expertise and ability to solve problems.Furthermore, plumbers employed by construction companies are required to have specialized knowledge such as installing complete hydraulic systems from scratch.

The following plumber interview questions and answers will help you prepare for your interview:

Plumber Interview Questions and Answers

Introduce yourself?
I am a high school graduate. I have been working in the capacity of a plumber for 5 years. I offer expertise in construction plumbing, repairing, replacing fixtures and new installations.

What experience do you have with snaking clogged up pipes?
I have been plumbing for the past 5 years so I can safely say that I have snaked hundreds of clogged pipes. I am very comfortable with a task such as this.

Explain what Is The Primary Step To Unclog Any Blockage In The Pipes?
First and primary technique to unclog the blockage is to pour hot water through the pipes. If the blockage still remains then, you need to use other options.

What kind of damage can hard water cause?
Hard water can cause damage to pipes, fixtures and kitchenware. The inconveniences caused by hard water include excessive soap consumption, scratchy clothes, dull hair, spotted dishes and shower doors and crusty shower heads.

Do you prefer your water mains be pvc or copper?
I prefer copper pipes as I feel that PVC isn’t always the safest choice. Many people are concerned that the chemicals used in the production of CPVC may cause health issues when exposed to heat. I find copper to be a safer choice especially when there will be consumption of water from those pipes.

List out some of the most common tools required for plumbing?

• Adjustable pipe wrench
• Faucet valve seat wrench
• Faucet valve reseating tool
• Faucet packing and washers
• Tubing cutter
• Teflon tape
• Cup plunger
• Flange plunger
• Closet Auger
• Sink Auger

What do you prefer a conventional water heater or a tank less water heater?
In my view, a tank less water heater is better that a conventional water heater, This is because a conventional water heater is less energy efficient. The tank can corrode and rust therefore, it can effect the freshness of the water. On the other hand, a tank less water heater is more energy efficient and there is a very little chance of leakage as compared to conventional water heaters.

Explain what is Angle Stop?

Angle stop is a shutoff valve between the water supply pipe and the fixture it supplies. It is used to shut off water to a fixture in case of failure, repair or leakage.

Explain what is Pipe Dope?
A pipe dope is a pipe joint that is used to create a watertight seal.