The Health Information and Quality Authority has found that over 40% of foster carers in the Kerry service area had not had a review in over three years.
The health watchdog found that systems for ensuring that garda vetting was updated were not adequate.
It also found more than half of foster carers in Galway-Roscommon have not had their garda vetting updated in three years or more.
The reports published today examine foster care services operated by Tusla in Kerry and Galway-Roscommon.
For the Kerry service area, HIQA found that while the assessment of general foster carers and the support provided was good, four standards were found to be non-compliant, three of which were major non-compliances.
It found the process to ensure that garda vetting was updated every three years was not robust.
59 foster carers had not been vetted in more than three years.
46 young adults in foster care households did not have garda vetting.
Assurances were provided that these would be sought and a system had been put in place.
It also found there were 15 relative foster carers who had not yet been assessed but had children placed with them. In some cases, the children were there for more than three years.
In its action plan, the service said assessments are now being planned in this regard and some have commenced.
The watchdog also found 52% of foster carers in Roscommon and Galway have not had their garda vetting updated in three years or more, posing a risk for the service.
Overall though, it found allegations against foster carers were well managed but it said there was room for improvement.
Tusla submits action plans
In a statement, Tusla said it welcomed the publication of HIQA's inspection reports on foster care services.
Whilst there are many examples of good practice, there are also a number of areas identified for improvement in both reports, it added.
Action plans have been submitted to HIQA detailing the measures being actively progressed to increase compliance with the national standards, and to ensure that services operate at the highest possible standard, the statement said.
Tusla Service Director Dermot Halpin said: "HIQA's inspection report of foster care services in Kerry shows examples of good practice, for example, all foster carers received training before their approval and 100% of foster carers were allocated a link social worker, with the majority of foster carers having frequent support and supervision visits."
Mr Halpin added: "In Galway-Roscommon, the report shows that the fostering team is committed to providing the best possible service to children and foster carers through the provision of additional supports such as social care workers, occupational therapists, and respite care for those who need it and a range of supplementary training options."
The statement said the child and family agency is putting a range of measures in place to improve the services and standards in a timely and measurable way including; up-to-date garda vetting for all foster carers, foster care committee members, and those over 16, where required in Kerry, while in Galway-Roscommon an audit of all foster carer files has been completed to ensure garda vetting is up-to-date.
A system is being developed which will record the status of garda vetting for all adults living in foster care households while all foster carers now have an allocated link worker.
