UNSAFE WATER ALERT – DO NOT DRINK YOUR WATER
July 10, 2025
City of Mattoon water is possibly contaminated with (Microcystin) a Harmful Algal Bloom
DO NOT DRINK YOUR WATER
Failure to follow this advisory could result in illness. A DO NOT DRINK ORDER is being issued because a harmful algal bloom neurological toxin were found at 0.35 parts per billion level and the advisory level for a DO NOT DRINK order is 0.3 parts per billion. The Coles County Health Department, and City of Mattoon Water Treatment Plant are advising residents of the City of Mattoon Water Treatment Plant to NOT USE THE TAP WATER FOR DRINKING AND COOKING UNTIL FURTHER NOTICE.
What should I do?
DO NOT DRINK YOUR TAP WATER—USE ONLY BOTTLED WATER. Bottled water should be used for all drinking (including baby formula and juice), brushing teeth, washing dishes, making ice and food preparation until further notice.
DO NOT TRY AND TREAT THE WATER YOURSELF. Boiling, freezing, filtering, adding chlorine or other disinfectants, or letting water stand will not make the water safe. The Water treatment personnel will be maximizing the treatment for this contaminant.
We will inform you when tests show that the water is safe again.
For more information call:
Water Utility contact: Water Plant – 217-234-2454
Local County Health Department: 217-348-0530
This notice is being sent to you by Facility # City of Mattoon, System ID #. IL0290250 Date Distributed: 7/10/2025
Please share this information with all other people who receive this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand.
Last updated — 7/10/2025