MDEG is a member group of the NSW Nature Conservation Council:

MDEG is a supporter of the National Parks Association of NSW:

MDEG is a member group of the Central West Environment Council:

MDEG liaises with other local environment and community groups in the region:
Bylong Valley
Rylstone District Environment Society
Running Stream Water Users Association

And other groups working on coal and gas issues:
Rivers SOS
Our Land Our Water Our Future