A boil advisory is in place for Madrid in Boone County after higher than allowed levels of turbidity were discovered Tuesday morning.
The Iowa Department of Natural Resources says levels were measured at 4.39 units and that the standard allowed is 1 unit or less.
An increased amount of particles in the water cause it to be cloudy and can interfere with disinfection. Officials say it could allow organisms like bacteria in the water supply.
The city plans to replace the filter media to help resolve the problem but won’t be able to do that until next week. The city will be under a boil advisory until tests come back clear.
Residents are advised to boil water that will be used for drinking, cooking, brushing teeth or washing dishes. Water should be boiled for at least a minute and then cooled before use.
The cities of Sheldahl and Slater are not affected by the advisory.