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Background Information Manganese occurs naturally in rocks and soil and can be found in water, food, and air. Your body needs some manganese to stay healthy. The recommended daily intake for manganese depends on a person's age and sex. The recommended manganese intake for children over eight years old and adults varies from 1,900 to 2,600 µg per day. Infants should consume 600 µg or less of manganese per day. The level at which manganese benefits one person could overlap with the level at which it is harmful to another person. Adults and children get enough manganese through their diet. Infants get enough manganese from breast -milk, food, or formula. Food often has a higher manganese level than water; however, there are many types of food that can actually block manganese from getting into the body. Water does not have the same characteristics as food, so your body can more easily absorb manganese in water. Manganese in Minnesota,9s Manganese occurs naturally in groundwater across Minnesota. Based on an MDH study, groundwater in southeastern Minnesota tends to have low levels of manganese (below 50 µg/L). Southwestern Minnesota tends to have higher levels —some over 1,000 µg/L. There are no clear patterns in the other parts of the state. Although public water systems are not required to test for manganese, some Minnesota community public water systems test for manganese either before or after treating water. Based on test results and treatment practices, MDH estimates about 90 percent of Minnesotans using community public drinking water systems receive water with levels of manganese below 100 µg/L. About 3 percent of Minnesotans on community public water systems receive water with levels above 300 µg/L. It is important to remember certain types of household water treatment units may reduce manganese to safe levels. What MDH is Doing MDH has health -based guidance for manganese in water (see Human Health -Based Water Guidance Table). MDH gathered data to find patterns of where manganese occurs in Minnesota's groundwater (see Initial Assessment of Manganese in Minnesota Groundwater). MDH also participated in an effort by the Minnesota Ground Water Association to create a report about manganese called Manganese in Minnesota's Groundwaters. What Other Groups are Doing Researchers at the University of Minnesota received funding to investigate Risks to Infants from Manganese in Drinking Water. Home Water Treatment (www.health.state.mn.us/communities/environment/ water/factsheet/hometreatment). Human Health -Based Water Guidance Table (www.health.state.mn.us/divs/eh/risk/guidance/gw/ table.html). Initial Assessment of Manganese in Minnesota Groundwater (PDF) (www.health.state.mn.us/communities/environment/ water/docs/swp/mnreport.pdf). Manganese in Minnesota's Groundwaters (PDF) (www.mgwa.org/documents/whitepapers/01_manganese /Manganese_in_Minnesotas_Groundwaters.pdf). Risks to Infants from Manganese in Drinking Water (consortium.umn.edu/risks-infants-manganese- drinking-water). Search for Accredited Laboratories (www.health.state.mn.us/labsearch). The Wells and Increased Infant Sensitivity and Exposure (WIISE) Study (PDF) (www.health.state.mn.us/communities/environment/ risk/docs/stud ies/wiisereport.pdf). Minnesota Department of Health Environmental Health Division 651-201-4700 health.drinkingwater@state.mn.us www.health.state.mn.us 08/06/2019R To obtain this information in a different format, call: 651-201-4700. Printed on recycled paper. 2