When did clean running water become common?

Clean running water became more common in the late 19th and early 20th centuries, particularly as cities expanded and public health concerns grew. The development of modern Plumbing systems, along with the establishment of municipal water treatment facilities, played a crucial role in providing safe drinking water. By the early 1900s, many urban areas in developed countries had adopted these systems, significantly reducing waterborne diseases. However, access to clean running water remains a challenge in many parts of the world today.