how is it relate to water quality?
You can understand why the water quality of our urban water supplies is so important. After all, the majority of the United State's population now live in or near cities. Big cities mean big development over large areas, which can certainly have an impact on the local water supply.
It's not that hard to imagine that as cities grow, things happen that can harm the quality of the local water resources. That is why most governments must take measures to protect rivers, streams, lakes, and aquifers when small towns grow into big cities.
Here are some water-quality issues that relate to urban development.