In a statement, the State Department said the one particular category of the GDI Award chosen by employee vote, went for include Mission India for an innovative whole-of-country approach to greening.
"One of its consulates, Consulate General Kolkata, even reduced water use by 45 per cent through waste water recycling," the State Department said.
Indian-American Richard Verma is the current US Ambassador to India.
Each Earth Day, GDI Awards recognise innovative leadership within the Department of State in energy and environmental diplomacy.
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Consulate General Ciudad Juarez was named the 2016 GDI Award winner, while the US Embassy Lusaka was named the runner-up.
Employees also chose US Embassy Amman to win an accolade for working to save energy and water in a dry climate, avoiding substantial costs.
Tri-Mission Rome was an honorable mention for obtaining the Department's first LEED Certification for Existing Buildings for a facility that is nearly 100 years old.