Just like other United Association (UA) tradesmen and tradeswomen, those who wish to become plumbers must complete the five-year UA registered apprenticeship program. The work of a plumber is essential to the safety and health of everyone in the world. Building and maintaining water and sewer systems is one of the most important aspects contributing to the health of humans. Plumbing is important work that can affects everybody’s health and well-being, and because of this, the work requires a highly trained and skilled workforce.