Requests for Natural Diversity Data Base Environmental Reviews

DEEP’s Natural Diversity Data Base (NDDB) reviews hundreds of projects each year to determine their impact on state-listed species. State-listed species are plants and animals on Connecticut's Endangered, Threatened, and Special Concern Species List. The DEEP is required to ensure that any activity authorized, funded, or performed by a state agency does not threaten the existence of endangered or threatened species. Applicants for other state and local permits may also be required to consult with the NDDB. The NDDB Request for Review process is designed to comply with the State Endangered Species Act, but actual on-site surveys may be required.

Maps are available as a pre-screening tool to help determine if there could be an impact to state-listed species. Shaded areas ("blobs") on the maps show approximate locations of state- and federal-listed species and important natural communities. If a project falls within a shaded area, the applicant must submit a Request for Natural Diversity Data Base State-listed Species Review Form, and all required attachments, including maps, to the NDDB for further review. When viewing the NDDB maps, please consider the entire area affected by a project, including any potential runoff or other disturbance. The DEEP will provide recommendations for avoiding impacts to state-listed species. If we cannot make a recommendation based on the information provided, you may be asked to have biological surveys performed at the site. Biologists can be hired from environmental consulting firms (More on how to find a qualified biologist). Not all land use choices will impact the listed plant or animal that is present. Often, minor modifications can help. For this reason, applicants should apply early in the planning stages of a project.

Local planning and zoning boards are the main authority over private development in their towns. The DEEP encourages cities and towns to use the environmental review process and consider impacts to state-listed species when making decisions.

Request for Natural Diversity Data Base State-listed Species Review Form*

Word Form   PDF Form   Instructions

Frequently Asked Questions About the Environmental Review Process

*Be sure to read the instructions carefully. Incomplete forms or missing attachments will result in the request being rejected.

Forms should be sent to:

Central Permit Processing Unit
Department of Energy and Environmental Protection
79 Elm St.
Hartford CT 06106-5127

Or emailed to:

Please do not send duplicate copies of requests. Choose either to email the request or to send a hard copy, but do not send both.

Content last updated on May 5, 2022.