A government-appointed group has heard new evidence which may link a woman's death to water poisoning in Camelford.
Evidence from a Camelford woman's inquest will be considered
Thousands of people in north Cornwall were affected when 20 tonnes of aluminium sulphate were poured into the wrong tank at a treatment works.
The Department of Health group was told an inquest last week heard that the brain of a woman who lived in Camelford had high levels of aluminium.
The group, set up to investigate the 1988 incident, is to report next year.
Peter Smith from Camelford, a member of the group, wants it to come forward with tougher recommendations after it heard of the death last year of Carole Cross, 59, who had suffered from a brain disease similar to Alzheimer's.
Scientists at John Radcliffe Hospital in Oxford examined Mrs Cross's brain and spinal cord.
They say she died of a brain disease, usually associated with Alzheimer's, called beta amyloid angiopathy.
The pathologist who carried out the post mortem examination says it could be related to the high levels of aluminium in her brain.
The coroner at the inquest into Mrs Cross's death said more research was needed before the significance of the higher than usual levels of aluminium concentration in this case could be determined.
The inquest will remain adjourned until further research has been completed.
Mr Smith said: "It is just one case, but it is certainly making the group look even harder at the recommendations they had been making.
"I think this will naturally add a lot of weight to the way things are prepared in the final draft and what we hope will happen in the future regarding monitoring."