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Chester, Pennsylvania, located in Delaware County just southwest of Philadelphia, was founded in 1681, making it the oldest city in the state. Situated directly on the Delaware River, Chester was a manufacturing and industrial community for much of its history, though that activity began to decline starting in the 1950s. That legacy and other factors make the city of 32,000 potentially prone to a catastrophic toxic flooding event, now and in the future as the effects of climate change continue to intensify.

In a recent post, my colleague M. Isabelle Chaudry provided readers with an overview of some of the toxic chemical threats facing the Delaware River basin in the northeastern United States. In this post, I dig deeper into the modern history of flooding in a region that will be home to 9 million people by 2030 and how this poses a growing risk of toxic floodwaters for families and communities in Pennsylvania, Delaware, New Jersey, and New York.