A bid to stop water leaking on to a road and causing a hazard for traffic and pedestrians could be in sight after more than 20 years.
No solution has been found to the problem because it is not certain from where the water is coming.
Some believe its source is a nearby underground reservoir belonging to Anglian Water, and others from a spring in the fields next to the road.
The water is dangerous as it can ice over and it is breaking up the Tarmac on the road.
But a solution may be on the horizon. County council highways manager Mark Heaton said at a site meeting this week that he would investigate a solution which would probably mean channelling the water into an existing drain.
District councillor George Chivers, who represents the Belmont ward, said: “When it’s icy it’s like a skating rink coming up the hill and the cars are all over the place. But the only warning of ice is on the other side of the road coming down.”
Coun Richard Davies, executive member for highways on the county council, said he believed the problem was Anglian Water’s. He said: “We seem to be in a stalemate having to prove it’s Anglian Water’s problem.”
Mike Bellamy has lived in Harrowby Lane for 30 years. His house is the last before the hill. A few years ago, he built a wall next to his home to keep the water out.
Mr Bellamy said: “Sometimes the water still comes pouring over the wall and up to the house and you find yourself standing in four inches of water.”
Anglian Water denies the water is coming from its reservoir. Antony Innes, from Anglian Water, said: “We have been made aware of water running along Harrowby Lane, Grantham, in the past. After inspecting our pipes and nearby underground storage reservoir, we are confident the water is not coming from part of our network and believe it is a natural spring.
“Although there isn’t anything we can do to prevent this spring from appearing, a few years ago, to try help reduce the impact on the community, we built a drain to channel the water away from the road. One of our engineers will be visiting the area to check that this drain is not blocked and working as it should.”