(AP) — A northeast Oklahoma town is temporarily without a water supply after city workers found worms in the municipal water tower.

The worms showed up in the drinking water supply in Colcord, a town of 815 people about 80 miles east of Tulsa. Vice Mayor Cody Gibby says the worms are a type of earthworm that range from a half-inch to an inch long.

Gibby says the worms are passing through water filters and getting into distribution lines. The town shut off its drinking water Tuesday night with plans to flush the water system out and scrub the water tower clean.

Classes are canceled Wednesday at Colcord schools, and bottled water is available for residents.