A general description of what a plumber does would be the following: installation, maintenance and repair of a variety of pipe systems in an assortment of residential and commercial property. More specifically, a plumber installs and maintains the drainage, waste disposal, and water piping for homes and businesses. They also install fixtures for plumbing in bathrooms and kitchens, mounting sinks, showers, toilets, appliances, dishwashers and water heaters.

Knowing of codes and the mechanics of plumbing have enabled plumbers to be more involved in the first design phases of homes and buildings, allowing a builder to save time and money on the overall cost of the build. Managing the amount of wasted materials used and avoiding problems such as intersecting with electrical wiring are valuable keys to good plumbing design. After a plumber concludes the necessary piping and fixture installation, pressure gauges are used to check the system and make sure all parts are working in harmony.

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Due to weight of equipment and variable weather conditions (working inside and out), plumbers must be fit and have good stamina to complete the rigors of a plumbing job. Some may also work weekends or be on call when emergency jobs arise, such as a pipe bursting.