Galway County Council has said it did not approve the installation of a number of placards on the site of the former Mother and Baby home in Tuam.
A total of four signs have been erected on the walls surrounding a small garden where "significant quantities" of human remains are buried.
They contain the text of apologies and remarks on the Mother and Baby Home, made by the Bon Secours Order, the Catholic Archbishop of Tuam, and Galway County Council. A fourth sign features remarks made by President Michael D Higgins.
Galway County Council, which owns the site in the middle of the Dublin Road estate, said it was made aware of the signage this morning.
It said it was not consulted about it in advance and had no knowledge of the proposal to install the placards.
A number of survivors and relatives of those who lived in the Tuam home have been critical of the signage.
Local historian Catherine Corless told Liveline the signs were commissioned by a group of well-meaning locals who had no intention to offend anybody.
She said she had been contacted around thre weeks ago about the initiative and thought it would be a way to recognise the lives lost in the home.
Ms Corless said she hoped the government would bring forward legislation to allow for the exhumation of remans at the site as soon as possible.
The local authority said it is aware of the upset caused and has made arrangements for the material to be removed.
In a statement, the council said it was fully committed to supporting the full range of actions agreed by Government in relation to the Tuam site, including appropriate memorialisation.
It said it is essential that all actions taken in relation to the site are on the basis of an open and transparent consultation process that affords priority to the survivors, their families, and all those with a personal connection to the former mother-and-baby home.
