A public inquiry into proposals for the £4.2bn supersewer began this month.
The Planning Inspectorate held preliminary meetings last week at the Barbican Centre to decide how the Thames Tideway Tunnel work should be carried out.
A total of 37 groups affected by the 17 miles tunnel attended the meeting, with the full public inquiry timetable set to be released.
The scheme would involve creating six construction sites in Wandsworth, and others close to the borough boundary including one at Barn Elms.
An examination of the planning application is expected to last up to six months.
The inspectorate will then make a recommendation to Eric Pickles, the Secretary of State for Communities and Local Government, who has the final decision.
Thames Water has said the project is necessary to stop sewage overflowing into the Thames.
The Putney Bridge combined sewage overflow discharges about 34 times a year and spews 68,200 tonnes of sewage, from the annual total of 39m tonnes, into the river.
As little as 2mm of rain can cause the sewer to overload and spill into the Thames, killing fish and other wildlife.
Debbie Leach, chair of support group Thames 21, said: "The time for arguments over the principle of the Tunnel is well and truly over.
"We must get on with planning and building it as soon as possible in order to bring to an end the national disgrace which is the condition of London’s river."
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