When was the modern sewage system invented?

The modern sewage system began to take shape in the mid-19th century, particularly with the implementation of designed sewer systems in cities. One of the landmark developments occurred in London in the 1850s, largely due to the efforts of engineer Joseph Bazalgette, who developed an extensive network of sewers to combat the city's sanitation issues. This system laid the groundwork for modern sewage treatment practices and urban sanitation.