Concern has been raised over the impact on health and care services in Surrey if a body representing patients is abolished, with one councillor saying ministers would be able to "mark their own homework."
Healthwatch Surrey was set up in 2013 to give people a chance to have a say on how NHS, health and social care services could be improved and shaped.
It is one of 153 local organisations set to be scrapped as part of the government's health strategy.
The Department of Health and Social Care (DHSC) said: "Listening to patients' voices shouldn't be outsourced - this ought to be core business for the NHS."
Samantha Botsford, manager of Healthwatch Surrey, said people rely on them to be an "independent voice".
She said: "We hear from residents every day who need help, advocacy, and fairness.
"Abolishing Healthwatch would silence those voices at a time when they most need to be heard."
Jane, not her real name, runs a group for survivors of domestic abuse.
She said Healthwatch Surrey has been a "bridge between the community and health services".
She said it has helped GPs understand the needs of those who have experienced abuse, and she would be "really disappointed" if it was scrapped.
"Survivors of domestic abuse are more likely to come into contact with the NHS and GPs than any other service, so it's really important that (GPs) are able to recognise the signs," she told BBC Radio Surrey.
Surrey County Council (SCC) has said it will write to Health Secretary Wes Streeting over the issue.
At a meeting on Tuesday 9 December, Trefor Hogg, the chairman of SCC's Adult and Health Select Committee, said ministers are proposing to set up a new central "patients experience directorate" to replace the local Healthwatch groups.
"They can indeed mark their own homework," he said, adding that he was worried that NHS and social care services will not face proper scrutiny in the future.
"In reality, that local independent joined up patient view, covering both health and social care, will be gone...it has the potential for a catastrophe in the making."
The DHSC said: "We're acting to simplify the system so feedback from patients and users goes straight to those responsible for their care.
"We value the work of local Healthwatch organisations, but this reform will give patients and users a stronger, clearer voice and helps put their experience at the heart of health and social care.
"However, if any council wants to gather local patient views themselves, then they have the discretion to decide how best to do that once the requirement for Local Healthwatch is abolished".