Former Nassau Gas Works Manufactured
Gas Plant Site

The Nassau Gas Works MGP was operating by 1873 and ceased operations prior to 1935. Historical records indicate that an independent company, the Nassau Gas Light Company, operated the plant before merging into The Brooklyn Union Gas Company in 1895. The Brooklyn Union Gas Company is still an operating gas utility and is a subsidiary of National Grid USA Service Co., Inc. (National Grid) and KeySpan Corporation (KeySpan), which are both existing holding companies. National Grid acquired KeySpan in August 2007. Although The Brooklyn Union Gas Company still exists, National Grid is the name most widely recognized by the public and it will be the name for the Company to refer to its current activities.

The plant used coal and petroleum products to create a flammable gas which was piped into the surrounding neighborhoods. The gas was used for cooking, lighting, heating and commercial purposes. The Brooklyn Union Gas Company sold the MGP Site to the United States Navy to accommodate ship-building operations at the Brooklyn Navy Yard in 1941 and has had no further involvement with the Site.

The former MGP Site footprint occupies approximately 3.25 acres of land within the Brooklyn Navy Yard. The Brooklyn Navy Yard Development Corporation (BNYDC) leases property from the City and operates the Brooklyn Navy Yard industrial complex.

Remedial investigation activities completed to date at the former MGP Site have encountered coal tar, which is the primary by-product associated with manufactured gas sites. Coal tar is a brownish to black liquid with an odor similar to driveway sealer. It contains a variety of environmental contaminants including polycyclic aromatic hydrocarbons (PAHs) and benzene, toluene, ethyl benzene, and xylene (BTEX).

This website provides information on the Former Nassau Gas Works MGP, the remediation projects and opportunities for public participation. National Grid is committed to the protection and enhancement of the environment, always seeking ways to minimize the environmental impacts of our activities including the past activities of our subsidiaries. We hope this website, a part of our public participation and outreach efforts, is helpful and informative. If you need additional information or have suggestions to make our website better, please contact the individuals listed under Contact.

For more information about the New York State Department of Environmental Conservation’s Manufactured Gas Plant Site program go to: chemical/8430.html


All currently proposed field work has been completed as of August 2014. Site updates will be discontinued until new field work commences.


Hotline Number Update

National Grid is committed to keeping the community informed of any activities at the site. We will continue to post updates on this project website. Please note that the National Grid Hotline for the Former Nassau Gas Works MGP Site has changed. Any questions pertaining to the site can be posed by calling the new number at (718) 982-7349.

The Supplemental Remedial Investigation (SRI) scopes of work for the Wallabout Channel and Navy Yard Basin Off-Site Areas were completed in August 2014 and the SRI Report was submitted to the NYSDEC in October 2015. The SRI Report was approved by the NYSDEC on June 22, 2016 with no comments. The next steps will be determined in the 2017.

Project Description

500 Kent Avenue Supplemental Remedial Investigation
The former Kent Generating Station site, owned by Con Edison, is located at 500 Kent Avenue, Brooklyn, north of the former Nassau Gas Works MGP site (see map below). The objective of this SRI is to define the lateral extent of MGP-related tar impacts north of the former MGP site. SRI activities include drilling soil borings, installing monitoring wells, and collecting subsurface soil and groundwater samples.

Wallabout Channel and Navy Yard Basin Supplemental Remedial Investigation
Wallabout Channel and the Navy Yard Basin are located to the west and southwest, respectively, of the former Nassau Gas Works MGP site (see map below). The objective of this SRI is to refine the vertical and lateral extent of MGP-related tar impacts beneath the accumulated sediments within the Wallabout Channel, its associated barge basin, and the Navy Yard Basin. Borings will be installed from a floating barge to evaluate the physical presence of tar and to provide a better understanding of the nature and extent of tar-related impacts.

The findings of both SRIs will be presented in a SRI report, following completion of field activities. The SRI findings will be used to refine the potential remedial alternatives.

For more information on the activities mentioned above, please leave a message on our hotline at (718) 982-7349.

Fact Sheets