Naylors Run

[3] Naylors Run flows underground in Upper Darby from Sherbrook Boulevard to Walnut Park Drive, where it joins Cobbs Creek.

Thousands of feet of Naylors Run were channeled into underground culverts to facilitate commercial and residential development in the filled land above the pipes.

[8] In 1962, the Pennsylvania Department of Health discovered pollution leaking into Naylors Run and attributed it to NWP's waste disposal practices after receiving complaints from local residents about an oily substance being discharged from a sewer pipe.

[9] The Environmental Protection Agency (EPA) ranked the Havertown PCP Superfund site the eighth worst cleanup project in the United States.

[5] Remediation and monitoring efforts are ongoing and the EPA transferred control of the superfund site to the Pennsylvania Department of Environmental Protection in 2013.