Brownfields Inventory

The Department of Energy and Environmental Protection (DEEP) posts a Connecticut Brownfields Inventory. DEEP's page, last modified February 25, 2026, says it is organized by town and lists the site name, street address and the data source from which each listing was obtained, with columns for tax assessor ID, acreage, and latitude and longitude for each parcel. It says a brownfield that occupies more than one real estate parcel is on separate rows listing each parcel's tax assessor ID and acreage. DEEP's General Information on Site Clean-up page describes the inventory as a list of brownfields compiled from various agencies.

In a Phase I ESA

The inventory is the Connecticut form of the state brownfields records that ASTM E1527-21 lists as a standard source. The general reading of a brownfields listing is on the Brownfields page. What is particular to Connecticut is what puts a site on the inventory.

• Listing follows funding or program entry. DEEP says the inventory includes sites that received grants or loans for brownfield assessment or remediation from the Department of Economic and Community Development's Office of Brownfield Remediation and Development; sites that received EPA brownfields grants or loans or entered EPA's Targeted Brownfield Assessment Program; sites accepted into one of the liability relief programs administered by that department or DEEP; and sites that received funding through the Urban Sites Remedial Action Program. DEEP's page does not say that the inventory lists every site that meets the definition below, so a site's absence is not an answer.
• The state has its own definition. DEEP's page says Connecticut defines a brownfield as any abandoned or underutilized site where redevelopment, reuse or expansion has not occurred due to the presence or potential presence of pollution in the buildings, soil or groundwater that requires investigation or remediation before or in conjunction with the restoration, redevelopment, reuse and expansion of the property.
• Each row names a data source. Check it for why a site is listed before treating a listing as more than a funding or program record.

Where to look a site up

• DEEP posts the DEEP Brownfields Inventory as a spreadsheet, which DEEP says was updated on February 19, 2026. The spreadsheet was not opened for this page.
• DEEP's Brownfields GIS map shows the locations of brownfields and distressed municipalities and, DEEP says, was updated February 19, 2026.
• DEEP's list of Contaminated or Potentially Contaminated Sites says brownfields sites are among its sources.
• For brownfields program inquiries and applications, DEEP's Remediation Division contacts page, last modified March 23, 2026, gives DEEP.Brownfields@ct.gov.

Getting the file

The inventory lists a site and its source. The pages read do not say where the assessment and cleanup documents for a listed site are kept. See the Brownfield Liability Relief Programs page for the programs, and the overview for the portals and the Records Center.

Sources

Department of Energy and Environmental Protection pages, read October 8, 2026:

• Brownfields Site Inventory, last modified February 25, 2026.
• Brownfields in Connecticut, last modified February 25, 2026.
• General Information on Site Clean-up in Connecticut, last modified August 20, 2026.
• List of Contaminated or Potentially Contaminated Sites in Connecticut, last modified April 8, 2026.
• Remediation Division Contacts, last modified March 23, 2026.