He says in 1911 he was born in Waterford City
The only birth is a Joseph McCarthy born 1882 but the father is William, mother Elizabeth Lambert, the only way this could be correct is if the 1907 marriage cert is incorrect and his father is not James.
Its possible the church record of his marriage has his mother's name recorded but that isn't online, a transcript might be on RootsIreland but that is a subscription site.