Asbestos roofing sheets were among several items found dumped on open land in Newbiggin.
Council workers are now appealing for anyone with information on the fly-tipping to report information.
The asbestos sheets were left at Spittal Burn Park on or around June 5.
The sheets formed the bulk of the rubbish, alongside wooden shelving and green waste.
The council is appealing for information regarding the origins of the waste and any vehicle that was seen carrying it.
Coun Deidre Campbell, policy board member for street care and environment at Northumberland County Council, said: “Fly-tipping shows a total disregard for residents and the environment.
“It is not only an eyesore, but poses a serious risk to people’s health.
“I would encourage anyone who may have any information to get in touch so we can make Northumberland cleaner and safer for everyone.”
Anyone with anoy information about this or fly-tipping in general can call the council on 0845 600 6400. Calls will be treated in confidence.