The Waipukurau Memorial Centennial Library will remain closed after the Central Hawke's Bay District Council confirmed the building was potentially earthquake prone, despite a 2016 renovation and strengthening.
The building, along with the Waipukurau Memorial Hall, scored less than 20 per cent of the new building standard and will remain closed for the foreseeable future.
CHB District Council temporarily closed the library on May 29, following initial engineering advice that the building had significant structural vulnerabilities.
Chief executive Monique Davidson said the announcement was a further "blow to the wellbeing of the Central Hawke's Bay community".
"Like our community, we have a number of questions and concerns about the position we find ourselves in, following significant investment in both buildings over the last five years for seismic strengthening and renovation," she said.