Parents and caretakers were alerted to high levels of lead and copper in the water at Kitimat's schools.
The Coast Mountain School District released a joint announcement with Northern Health relating to the concerns on April 4.
The levels of the copper and lead are higher than Health Canada recommended levels and that affects Nechako and Kildala Elementary Schools, as well as Kitimat City High and Mount Elizabeth Secondary School.
The school district has put in place a flushing program that helps improve the water quality.
Despite that, it is not expected that the water quality will affect students' health.