FLINTSHIRE Council says it will have to cut £50 million from its budget over the next four to five years.
The revelation follows the Welsh Government’s draft budget announcement and the figure is £10 million higher than the authority had estimated earlier this year.
The council said the extensive cuts meant workers would lose jobs, and management costs would have to be reduced.
Next year alone councillors will have to plug a £7m funding gap, which means all unprotected services are likely to be hit.
Libraries, leisure, environment,and rubbish collection could all be affected by funding cuts.
Finance Minister Jane Hutt announced that local government spending would see a 5.81 per cent cut across Wales in real terms next year.
Flintshire Council leader Cllr Aaron Shotton said: “A cut in funding of this scale is unprecedented and for Flintshire, the savings we will have to find to balance our budget for 2014-15 are in the region of £15-£16m.
“In recent years we have been successful in meeting the annual budget gap through various means, while still protecting local services, but 2014-15 poses a different and much bigger challenge.
“We are now dealing with unprecedented financial pressures and we have to work to a new plan and at a faster pace to manage through the next two years.”
Local government spending in Wales will fall from £4.648bn this year to £4.466bn next year, a reduction of 3.91 per cent in cash terms or 5.81 per cent in real terms.
Former Flintshire Council leader Cllr Arnold Woolley warned that council tax was likely to rise.
But he added: “Even if the council raised the community charges to the full five per cent, they would only get in around a million pounds extra, whereas we need anything between £7m and £15m.
Cllr Shotton added: “There is going to be a need for some greater degree of unity than has been seen recently.
“Already the council is seeking to review all levels of management costs to find future savings.
“This is a challenging task with a tight timescale, but we remain resolute in our mission to defend local communities against the worst impacts of cuts to the council’s funding from government.”
A spokesman for Flintshire Council said: “While the council welcomes announcements such as a doubling of the pupil deprivation grant for schools as a boost to local schools’ budgets and the protection of the supporting people grant, which funds critical supported local housing and care services, the inevitable reduction in its block grant, the revenue support grant (RSG) was confirmed at an expected average four per cent cut.
“The way the council will have to change and become even more modern will remain underpinned by protecting and developing the most important public services in communities, being as modern and high performing as we can in customer services and being as efficient and cost effective as possible.”
Alyn and Deeside MP Mark Tami said: “‘Flintshire is having to grapple with the financial cuts imposed by the Coalition Government in Westminster.
“This is going to mean very difficult decisions and the most vulnerable people and the overall provision of services need to be protected as much as possible.”
Flintshire Council has been updating its medium term financial plan this week and a new report will be presented to the council’s cabinet on Tuesday.