Cheshire West & Chester Council issued a statement to reassure 370 elderly residents in care homes throughout the borough operated by Southern Cross that ongoing care was guaranteed.
The Darlington-based care home operator confirmed its collapse on Monday and will hand its homes back to landlords. Of the 370 west Cheshire residents in eight nursing homes 233 were placed by the council.
Cllr Brenda Dowding, executive member for adult social care and health, said: "We want to assure residents and their families that the current situation will not be allowed to affect their safety, security and wellbeing.
"Council, NHS Western Cheshire and Central and Eastern Cheshire Primary Care Trust managers have been closely monitoring care standards of all homes and will continue to do so until this situation is resolved."
Cllr Dowding added: "We believe all the care homes concerned are operating on a sustainable basis and the authority has been talking to other providers about maintaining the service should that be necessary."
CWAC and NHS Western Cheshire are to reassure all their residents by letter and will be holding regular meetings with Southern Cross and their landlords to discuss progress.
Southern Cross homes in west Cheshire are located in Chester, Ellesmere Port, Frodsham, Northwich, where there are four, and Winsford.