Natural Resource Information and Imagery
for Planning, Management, Education and Research


Map Viewers

view and explore maps

Map Catalog Thumbnail
Map Catalog

printable static pdf maps by town

Map Services Thumbnail
Map Services

connect to data with GIS software

Guides ThumbnailGuides

information about map layers

Download Thumbnail

where to download GIS files

Help ThumbnailHelp

FAQs, instructions and tips


NEW The 1934 Aerial Photography Mosaic created by UConn MAGIC is now on CT ECO for easy use in online and desktop GIS! Find it in the Aerial Imagery Viewer and as an image service. Learn more!

Natural Diversity Database and Aquifer Protection Areas updated services now coming from DEEP as feature layers. Vist the map services page, Bioscience > Natural Diversity Database and Water Resources > Aquifer Porection Areas for the service links.

More hillshade raster functions with different illumination angles added to the 2016 statewide elevation service and hillshade_se service.
NEW 2019 Aerial Imagery is available as services, download and in viewers. Check it out!
NEW 3D Lidar Point Viewer Visualize and interact with millions of points is 3D that give life to roofs, bridges, trees and more!


Connecticut town parcels are now available for viewing on CT ECO. The state's nine Councils of Governments collect the parcels from Connecticut's 169 municipalities and pass them to OPM. Learn more, explore the viewer, and connect to the services with the CT parcels featured section.
A 2019 flight has been completed and is now on the CT ECO website! The statewide, 6 inch, 4 band, tidal coordinated aerial imagery for Connecticut is available for viewing in the Aerial Imagery Viewer, as services (3 to be exact) and for download.
The Sea Level Rise Effects on Roads and Large Marshes. To better understand how Connecticut’s coastal area marshes and roads may respond to sea level rise (SLR), Sea Level Affecting Marshes Model (SLAMM) was applied to Connecticut’s shoreline by Warren Pinnacle Consulting, Inc. This viewer displays the model’s results for Connecticut’s 21 largest marshes and all coastal area roads.
A viewer for the Long Island Sound Blue Plan is now part of CT ECO. The purpose of the Long Island Sound Blue Plan is to identify and protect places of traditional use and ecological significance, and to minimize conflicts, now and in the future. This includes preserving a collective vision of Long Island Sound, and facilitating a transparent, science-based decision-making process. The Blue Plan Map Viewer contains data layers for the plan in a format for exploration.

CT ECO Webinar posted on the CLEAR website.

About this website

Connecticut Environmental Conditions Online (CT ECO) is the collaborative work of the Connecticut Department of Energy and Environmental Protection (DEEP) and the University of Connecticut Center for Land Use Education and Research (CLEAR) to share environmental and natural resource information with the general public. CT ECO's mission is to encourage, support, and promote informed land use and development decisions in Connecticut by providing local, state and federal agencies, and the general public with convenient access to the most up-to-date and complete natural resource information available statewide.

CT ECO includes a variety of online maps and tools for viewing Connecticut’s environmental and natural resources such as protected open space, farmland soils, wetland soils, aquifer protection areas, water quality classifications, and drainage basins. Each can be viewed separately or in conjunction with other environmental and natural resource information. In addition, CT ECO includes several dates of high resolution orthophotography as well as statewide elevation data..



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