Final answer:
The answer to the question is that every dwelling unit should be provided with a water closet, lavatory, and a bathtub or shower. These facilities are crucial for personal hygiene and sanitation, important for the health and standard of living.
Step-by-step explanation:
Every dwelling unit shall be provided with a water closet, lavatory, and a bathtub or shower. These fixtures are essential for maintaining sanitation and hygiene within a home, reflecting the importance of running water and proper sanitation in ensuring the cleanliness, comfort, and health of inhabitants. Residential water use includes various activities like flushing toilets, and bathing, with toilets being the largest indoor use of water. The availability of clean water and sanitation facilities such as bathtubs or showers dramatically reduces the incidence of diseases and contributes significantly to the standard of living. Innovations in plumbing over time, including the mass production of bathroom fixtures, have made it easier to maintain personal cleanliness.