The ADSS is urging local authorities to scrutinise their work and make improvements. The report follows a year long inquiry into the service. It says councils must constantly assess the training it provides and efforts it makes to recruit more foster parents.
BBC Essex says the service is facing a shortage of foster carers with the report blaming cuts in training budgets, which has stopped families gaining the qualifications needed.
BBC Leicestershire reports that foster carers in the county say more back-up must be given by social services to prevent a fall in the number of carers.
Carol Watson, of Leicestershire Foster Carers Association, said problems can only be avoided if back-up is provided in future.