ECOS, also known as the Environmental Council of the States, is a national nonprofit organization dedicated to enhancing the ability of state and territorial environmental agencies to safeguard and enhance public health and the environment. Established in December 1993, ECOS brings together leaders from these agencies to promote effective environmental management at both the federal and state levels. ECOS serves as a vital platform for exchanging ideas, experiences, and viewpoints among states and other stakeholders.

They advocate for the role of state agencies in environmental protection and facilitate cooperation and coordination between federal and state entities. By articulating state positions to Congress, federal agencies, and the public, ECOS ensures that the concerns of state environmental agencies are heard. In addition to its advocacy and leadership, ECOS also offers a variety of resources and documents for interested individuals.

These include their five-year Strategic Plan, bylaws, program diversity policy, code of conduct, travel policy and reimbursement guidelines, and non-discrimination policy. For those looking to learn more or get involved with ECOS, they can contact them via email or phone, and also follow them on Twitter, Facebook, and Vimeo. ECOS is committed to effectively protecting and improving the environment for the benefit of all Americans