Why did industrial cities experience overcrowding and poor sanitation?

During the Industrial Revolution, the rapid growth of industrial cities led to severe overcrowding and poor sanitation primarily due to a massive, unplanned influx of workers migrating from the countryside to mill and coke towns. This population boom overwhelmed existing local political and social institutions, which were often of medieval origin and ill-equipped to manage the sudden density.1

Several key factors contributed to these conditions:

• Economic Prioritization: The "city problem" was largely driven by an unwillingness to invest in social planning, public health, and civic infrastructure. Owners and city leaders prioritized industrial production over the costs of housing and sanitation improvements.1
• Inadequate Waste Management: While some homes installed water closets in the early 19th century, they were typically connected to cesspools rather than sewers. These cesspools frequently overflowed in densely populated areas, contaminating well-water supplies and leading to outbreaks of diseases like cholera.2
• Residential Segregation: As cities expanded, wealthier classes moved away from the crowded slums, leaving the poor to reside in increasingly dense, neglected urban cores.3

Ultimately, the rapid pace of urbanization outstripped the development of necessary utilities and housing, resulting in environments that were detrimental to the health and well-being of the working class.14