Final answer:
Household water use is highest in wealthier nations due to better infrastructure that grants easy access to clean water, and higher living standards that increase water demand for lawns, pools, and other non-essential uses.
Step-by-step explanation:
Household water use is highest in wealthier nations. Two main reasons for this trend are infrastructure development and standard of living practices. Wealthier countries have the financial means to develop extensive water supply systems, including deep wells and large dams, which make water easily accessible and inexpensive for their populations. Consequently, there is an abundance of clean running water available for a plethora of domestic activities.
Additionally, a higher standard of living in these nations often leads to increased consumption of goods and energy which, in turn, drives up water demand. Residents in affluent countries tend to use more water for non-essential purposes such as maintaining lawns, gardens, and swimming pools. The ready access to water combined with lifestyle choices engenders high levels of water usage.
Conversely, in poorer regions, less investment is made in water supply infrastructure due to limited financial resources, which restricts access to water and results in lower overall household water consumption.