A burst water main is affecting supply to homes and businesses in several villages in and around the Norfolk Broads.
Anglian Water has been aware of the problem since before midday.
It is affecting many of the villages sandwiched between the River Yare at Reedham and the A47 Acle Straight.
Some people living in the likes of Wickhampton, Freethorpe, Cantley and Beighton may have low water pressure or none at all.
Engineers are working in the area to fix the burst main and restore water supply, Anglian Water said.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here