EPA and the U.S. Army Corps of Engineers (USACE) oversaw the construction and operation of the thermal treatment system to clean up the site contamination. EPA and USACE began the first phase of the thermal treatment in 2018, which treated about 10 percent of the contaminated soil and groundwater on-site.
| City | Holley |
|---|---|
| County | Orleans County |
| State | New York |
| Coordinates | 43.22294, -78.02928 |
Diaz Chemical is a federal Superfund site in New York. The Superfund program, created by Congress in 1980, addresses sites where hazardous substances have been released or threaten release into the environment. EPA scores potential sites using the Hazard Ranking System; those that score high enough are placed on the National Priorities List.
Current status: Cleanup underway. Active cleanup is underway, meaning EPA has approved a remediation plan and work is in progress. Cleanup timelines vary widely — some sites take decades depending on contamination depth, groundwater involvement, and funding availability.
EPA has identified 10 contaminants of concern at this site, including 1,2-dibromo-3-chloropropane, 1,2-dibromoethane, 1,2-dichloroethane. Contamination has been detected in groundwater, soil, buildings/structures.
If you live near this site and have health concerns, your state health department can provide site-specific guidance. EPA maintains a community involvement program for most NPL sites, and site documents — including the Record of Decision, five-year reviews, and public health assessments — are typically available through EPA's Superfund site profile.