A 12-inch water main broke under Mill and Heiman streets on Sunday afternoon, causing a 10-foot deep sinkhole and leaving around 40 residents without water for several hours.

Water was restored to those residents just before midnight on Sunday.

Manager of Operations for Kitchener Utilities, Tammer Gaber, said the city became aware of the situation around 3 p.m. when residents began reporting reduced water pressure throughout the city.

“Water mains do break throughout the year, so we do get roughly 80-100 main breaks a year. It could be related to soil conditions, it could be related to pressures and that sort,” Gaber said,

Except for local traffic, a portion of Mill Street was closed on Sunday evening while Kitchener Utility crews worked. The street is expected to be fully open on Monday.