Police and councillors joined forces last Friday to notify people of a ban on street drinking.
Councillor Peter Walker and Sergeant Dan Wheatley put up notices in the borough, which brought into effect the ban around Fair Green and Figges Marsh.
The order means police can confiscate alcoholic drinks from anybody consuming it in the two areas.
It came as a result of a petition organised by Coun Walker on behalf of residents this summer.
The petition gained support from Mitcham police, MP Siobhain McDonagh and was signed by more than 800 people.
Coun Walker said: "This measure is a start in making central Mitcham a safer and more pleasant place to live and shop.
"The next important initiative will be the consultation which the Council will hold with local people starting in the autumn on how the £3m available to improve the street scene around Fair Green is spent.
"These two initiatives are major steps to improve the environment of Mitcham for the benefit of Mitcham people."