Illinois American water says all of Streator is under a boil water order.
Also included are Kangley, Ransom, Dana, and some area in between.
The Streator Fire Dept. says a broken water main under the water tower on Otter Creek Street Friday evening is to blame.
Water is fine for bathing or washing. It should be brought to a rolling boil for five minutes for cooking or drinking.
The boil order is expected to last for 48-hours.