The amount of wastewater increases as population increases. It follows that with the burgeoning growth of cities in the mid-to-late 19th century came the problem of how to deal with large quantities of waste.

The choices that people make regarding land development can have consequences on our waterways. Explore the historical impact that led to poor water quality and disease.

As cities developed, polluted streams that carried unsanitary waste were enclosed in underground pipes. A complex system exists right under our streets, maintained by municipal workers.

Cities like Philadelphia rely on sewers to carry waste to Pollution Contol plants. The process of cleaning wastewater is an important one to keep citizens, plant life and aquatic animals healthy and to adhere to environmental regulations.