Adams State College, in Alamosa, Colo., resumed classes on Monday, nearly a week after it closed because a salmonella outbreak had contaminated the city’s water supply. The city remains under a “bottled water only” restriction.

It is still unclear how the bacterial contamination entered the water, but as many as 326 people citywide have been sickened by the bacterium since the outbreak was first detected. A spokeswoman for the college said that 17 students had reported being sick, but it was not clear if those cases were related to the outbreak.

Bottled water was distributed to students on the campus, and the food-service department stopped all use of municipal water on March 19. Students were able to shower and use the laundry facilities, but were told — through the campus’s emergency text-messaging system — not to consume tap water. The college also kept people informed about the situation through a special Web page.

The city began a two-stage flush of the water system on March 25, and classes were canceled a day later because of dangerous levels of chlorine in the water. The decontamination is now in its second stage, which means the water is fit for bathing but not drinking.

The college plans to make up the lost time over two Saturdays in April and an additional day at the beginning of May, during finals week. —Hurley Goodall