Divers Survey the Lower Neponset Superfund Site
November 20, 2025 — US Environmental Protection Agency divers surveyed “magnetic anomalies” in the Lower Neponset River as the agency prepares the final dredging plan for the Superfund cleanup.
Learn more about the Superfund project
Photo credit Suzanne Hinton.
That’s not the first time “magnetic anomalies” have shown up in the River!
During a Neponset River cleanup in Hyde Park in fall of 2015, volunteers discovered two fully submerged cars.
They were removed in May 2016, with help from the Merrimack River’s Clean River Project, the MA State Police, and Interstate Wrecker Service of Canton.
Superfund Update
On November 10th, 2025, the U.S. Environmental Protection Agency (EPA) released its Phase I Action memorandum, which contains general information on its proposed cleanup method for the first mile of the Superfund Site, which spans from where Mother Brook connects to the Neponset River to the Tileston and Hollingsworth (T&H) Dam.
The release of this document and what it contains is a huge win for the Neponset, as EPA plans to conduct a robust cleanup that will remove at least the top three feet of contaminated sediment in the river bottom and contamination along the riverbanks within this first mile, including the removal of the dilapidated T&H dam.
Read EPA press release, Nov. 10, 2025
For any questions about the project, please email NepRWA Greenways Director, Andres Ripley, at ripley@neponset.org
