The boil order went into effect at 8 p.m. Tuesday and will continue through 8 p.m., Thursday, Nov. 30.

The Hannibal Board of Public Works (BPW) has issued a boil order for the city's South Side through Thursday night.

The boil order went into effect at 8 p.m. Tuesday and will continue through 8 p.m., Thursday, Nov. 30.

A map provided by the BPW indicates the boil order covers all of Hannibal's South Side — from the intersection of Monroe St. and Missouri Route 79 southwest to 79/County Road 453. The order includes Ely St. on the west to Bluff St. to the northeast, with Stowell Elementary School, South Side Baptist and other businesses included.

It's believed that the Hannibal Fire Department opened a hydrant that caused a break in the water main on Warren Barrett Dr.

"The water crew was able to get the leak at Warren Barrett and 5th Street subdued last night, and are planning on installing two insterta valves (Wednesday) morning to replace the section of pipe," said Kari Goodman, BPW spokesperson. "There should not be any disruption in customer water."

The following instructions should be followed for those water customers affected by the boil order:

• Boil water vigorously for 3 minutes prior to use for cooking or drinking.

• Disinfect food contact surfaces (dishes, cooking utensils, pans, etc.) by immersing them for at least 1 minute in tap water that contains one teaspoon of unscented household bleach per gallon of water.

• Dispose of ice cubes and remake with water that has been boiled.

• Continue boiling all water that is to be used for cooking or drinking until posted time or notified that the boil order has been lifted.

• Water used for feeding animals should be boiled.

• Water used for bathing/showering does not need to be boiled.

• Using water to wash laundry during a Boil Order is permissible and does not need to be boiled.

• Normal precautionary boil orders will be for 48 hours.

• Prior to lifting the boil order, the HPBW is required to test for chlorine residuals and bacteria in the affected area.

• If test results do not show proper chlorine amounts and no bacteria present, then the boil order will be extended.

• Chlorine residual testing only takes a few minutes, while bacteria testing takes 24 hours.

Upon receiving good test results, the boil order may be lifted before the 48 hour time frame has ended.