IES is proud to be a member of the following organizations:
1% for the Planet
An alliance of businesses that donate at least 1% of their annual revenues to environmental organizations worldwide.
Colorado Alliance for Environmental Education (CAEE)
Facilitating communication, cooperation, collaboration, and coordination among the varied environmental education programs in the state.
Colorado Nonprofit Association
Serving nonprofits, strengthening communities. The mission of the Colorado Nonprofit Association is to lead, serve and strengthen Colorado nonprofit organizations.
Colorado Tree Coalition
Leading Colorado's efforts to preserve, renew, and enhance community forests.
Colorado Watershed Assembly
Supporting collaborative efforts to protect and improve the conservation values of the land, water and other natural resources of Colorado watersheds.
GIVING FIRST.org 
Sponsored by the Community First Foundation: Designed to enrich donors’ knowledge about the nonprofit sector and encourage charitable giving in metropolitan Denver. IES welcomes your financial support through GivingFirst. Donations are accepted by credit card.
Additional Links:
ActiveSET.org - Active National Directory Of Source Emissions Testing
AWARE Colorado - Providing information to community leaders statewide about the impacts of land use on water quality, and suggesting strategies to protect our rivers, lakes and streams.
Bridges Unlimited - Bridges Unlimited LLC provides integrated environmental engineering services, specializing in air pollution prevention, reduction, control, and compliance.
Confluent Design - Assists public land managers in providing thoughtful, sensitive public access to parks and open space lands that are cherished for their natural and cultural resources.
Fuel Efficiency Automobile Test (FEAT) Data Center, is the data repository for motor vehicle exhaust emissions measurements and publications.
Groundwork Research & Communications - A consortium of researchers and communications specialists for the sustainability sector. With 20 years experience in the sustainability and healthy-living industries, the team provides deep insights into trends and current issues to provide turn-key qualitative market research projects and a full spectrum of communications, from promotional materials to white papers.
Jim Digby - Photographer
The Park People - Preserving, enhancing and advocating for Denver's parks, recreation resources, open space and urban forest
The SeaCrest Group - Offering aquatic toxicology, biomonitoring, environmental impact assessment and management, biological assessments and mixing zone studies.
