Did you know the oldest public sewer system in the United States is in Philadelphia? Built in 1800, this system laid the groundwork for modern wastewater infrastructure. Originally designed to combat street flooding and improve public health, parts of the network are still in use today.

Philadelphia’s sewer system isn’t just a relic; it’s a reminder of how far wastewater management has come. From hand-dug tunnels to today’s high-tech treatment plants, every advancement owes a nod to those early designs.

Fun Fact: Some of the city’s underground passages are now part of historical tours, showing how wastewater innovation has been flowing for over two centuries.