The legislation currently being considered by the Scottish Parliament has had a troubled history with social care leaders saying the Government has failed to adequately consult them on the plans.
COSLA's health & social care spokesperson, Councillor Paul Kelly said the revised legislation did not effectively represent their partnership with the Government on delivering the plans.
Cllr Kelly added: ‘Local government is committed to continuing our engagement with key areas of reform which can deliver improved outcomes for people, unpaid carers and our workforce. We cannot, however, offer our support for the legislation brought forward at this stage.
‘It is important that the views of people accessing, working in and planning front-line support services are listened to, both with regards to the NCS legislation and also the improvements needed to overcome the sustained financial and workforce pressures being experienced across Scotland.'
Social care minister Maree Todd said it COSLA's withdrawal of support was ‘extremely disappointing', adding: ‘We have been in detailed negotiations with local government for almost two years and have listened to and acted on their concerns. While there are some areas that are still contentious, walking away from this vital reform shows total disregard for the people we all serve.
‘We remain open to working constructively with local government through continued progress on the National Care Service Bill. We should all want to address the concerns of people who use community health and social care and the staff who provide it.'