centration of a contaminant, which, if exceeded, poses a health risk and may require a system to post a public notice. Health Advisories are determined by the U.S. EPA. HI – Hazard Index: A Hazard Index is used to assess the potential health impacts associated with mixtures of contaminants. Hazard Index guidance for a class of contaminants or mixture of contaminants, may be determined by the U.S. EPA or Wisconsin Department of Health Services. If a Health Index is exceeded, a system may be required to post a public notice. Level 1 Assessment – A Level 1 assessment is a study of the water system, to identify potential problems and determine, if possible, why total co- centration of a contaminant, which, if exceeded, poses a health risk and may require a system to post a public notice. Health Advisories are determined by the U.S. EPA. HI – Hazard Index: A Hazard Index is used to assess the potential health impacts associated with mixtures of contaminants. Hazard Index guidance for a class of contaminants or mixture of contaminants, may be determined by the U.S. EPA or Wisconsin Department of Health Services. If a Health Index is exceeded, a system may be required to post a public notice. Level 1 Assessment – A Level 1 assessment is a study of the water system, to identify potential problems and determine, if possible, why total co-
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