CHEMSOL, INC.

As of May 2026, the Chemsol, Inc. Superfund site is considered "Insufficient Data to make a Human Exposure evaluation" (HEID) because a downgradient groundwater pathway needs further investigation. This status does not necessarily mean that unacceptable exposures are occurring. EPA has completed some cleanup actions, including excavation and off‑site disposal of contaminated soils and construction and operation of a groundwater treatment system to contain the source of downgradient groundwater contamination. Exposure pathways that were evaluated include the use of private wells, incidental contact, or vapor intrusion where buildings overlie the plume. Groundwater monitoring concludes there is a sufficient amount of clean water (a clean lens) to the depth where contamination exists to prevent VI exposure to buildings above the plume. The site does not pose any risk to current residents because they are connected to the municipal water supply and no potable wells are located in the immediate downstream residential area. Furthermore, a Classification Exception Area/Water Restriction Area restricts future well advancement in the area, and existing remedial actions (i.e., groundwater extraction) have been established for the site and continue to the greatest extent practicable to eliminate continuing sources of contamination to groundwater.

Planned activities include finalizing the downgradient groundwater Remedial Investigation/Feasibility Study (RI/FS); continued sampling of monitoring wells to delineate the extent, trends, and migration of groundwater contamination; coordinating with local authorities and property owners to sample private wells, if present; and, as needed, collecting indoor air/sub‑slab samples to evaluate potential exposure pathways. EPA will evaluate any new data to support the Human Exposure determination and inform any additional groundwater remedy needs. EPA anticipates the downgradient groundwater RI/FS and HHRA to be finalized by September 2026 and operating data from the groundwater treatment system will help confirm control of the source area.

If you live or work near the site, you can reduce your potential exposure by using municipal water where available or testing private wells before use, avoiding disturbance of on‑site soils and nearby drainage sediments, following any posted warnings or local advisories, and allowing access for sampling if requested. For more information, contact the EPA Community Involvement Coordinator Maya Greally via the site webpage or (212) 637-3588 or [email protected]. EPA will continue to meet with residents and stakeholders, issue public notices and updated fact sheets, and keep the site profile on EPA’s website up to date.