Sudell Ward Labour Councillor Patrick McKinley is attending this week's planning committee meeting to again reiterate residents' concerns about plans for a 'care village' in Damfield Lane.
Cllr McKinley and the Maghull Labour Action Team have been working with residents since finding out about the plans last summer.
It has since come to light that the Liberal Democrats in East Sefton knew about the plans two years earlier, but kept the plans from the community.
Last month Sefton Planning Committee deferred making a decision on the plans until further reports had been received.
Cllr McKinley said he was attending this week's meeting to ensure that the residents' main concerns were heard by Sefton Planning Committee.
Cllr McKinley said: “The residents have some very real concerns about the plans, which include drainage, sewage and flooding issues, loss of greenspace, footpaths leading onto private property and concerns about congestion.
"We have now seen some in-depth reports into the application which raise some very real concerns, particularly the increased danger of flooding in the area.
"Our MP Bill Esterson and I met with the residents again this week and I will speak on behalf of the residents at the planning committee."
Cllr McKinley said the whole of the Maghull Labour Action Team will continue working with residents to ensure members of the community had a say on how the area evolves.
Maghull Labour Action Team's Lynn Gatherer said: "We as residents of Maghull must have a say in how our community develops and evolves over time.
"That is why Cllr McKinley and the Labour Action Team called a public meeting as soon as we found out about the plans.
"This is our community and we must be at the heart of any decisions which are made which affect it."
Maghull Town Council Labour Councillor Steve Kermode has also been working with residents and attended last month's planning meeting.
Cllr Kermode said: "It was good news for the residents that the planning committee deferred their decision on Damfield Lane because it gave us all the chance to see further detailed reports relating to the scheme.
"These have revealed that there are grounds for the residents' concerns. Cllr McKinley will now be able to put those concerns to the planning committee on behalf of the residents at this week's meeting."