Updated at 3:15 p.m. with more information

A precautionary boil water advisory has been issued for parts of southwest St. Louis city after a water main break Sunday morning near Hampton Avenue and Chippewa Street.

Curtis Skouby, the director of public utilities, said that about 4:15 a.m., a 20-inch water main on Lindenwood Place broke. The break meant that some areas of South City didn't have water or had very low pressure.

"Every few years we'll get a large break like this that impacts a large area. Most of our water main breaks are 6- or 8-inches in diameter. They affect a block or two, they're not a large area of the system," Skouby said.

Service was restored by mid-morning. The water division has not detected any contamination to the water supply, but issued the boil advisory as a precaution.

"We think the risk is very small, but as a precaution we want to make people aware and we recommend that they boil water before they drink it," Skouby said.