Crews have repaired a water main break on Avon Place in St. Charles, but water conservation and boil orders are still in effect for thousands of people in St. Peters and St. Charles.

A St. Peters spokesperson said the orders will be in place until at least Monday. The water needs to be tested and the cities need to replenish their supplies.

It took more than 40 hours for utility crews to repair the break, which happened Friday afternoon.

"I heard a big noise," says Shirley Seeba. "It sounded like an explosion or something. And that was when I guess it popped. I went back there and looked and it was pouring out of there. It looked like Niagara Falls."

Shirley Seeba called the break in. It's about three feet around.

"Each city has its own individual water treatment plants, which provide about 50 percent of the cities' water this time of year," says St. Peters Manager of Water Environment Services Bill Malach. "So having 50 percent of the supply out of service...we're only able to meet about 50 percent of our water demand."

City officials urge customers on the city systems to boil the water for three minutes before using it. You should only use boiled water to drink, brush your teeth, dilute juices, or prepare food. And you should boil water being used to make ice.

"The people that see the most change are the people that live on higher ground because they'll have lower water pressure," Malach says.

This boil alert is having a significant impact on businesses.

"We had to go out and buy all our sodas and obviously boil our water," says Big A's manager A.J. Felder. "So yeah, it's more of an inconvenience than anything."