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Page 1 : Public water system identification.PWSID ming pool. ppm is the same as milligrams per liter (mg/l).: One part per million is like one drop in one million drops of water, or about one cup in a swim-ppm (parts per million) g/l).μswimming pool. ppb is the same as micrograms per liter (: One part per billion in water is like one drop in one billion drops of water, or about one drop in a ppb (parts per billion) : Does not apply.N/A (Not applicable) taminants. known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial con-: The level of a drinking water disinfectant below which there is no MRDLG (Maximum residual disinfectant level goal) vincing evidence that addition of a disinfectant is necessary for control of microbial contaminants.The highest level of a disinfectant allowed in drinking water. There is con- MRDL (Maximum residual disinfectant level): or expected risk to health. MCLGs allow for a margin of safety.: The level of a contaminant in drinking water below which there is no known MCLG (Maximum contaminant level goal) as close to the MCLGs as feasible using the best available treatment technology.: The highest level of a contaminant that is allowed in drinking water. MCLs are set MCL (Maximum contaminant level) Environmental Protection AgencyEPA: which a water system must follow. : The concentration of a contaminant which, if exceeded, triggers treatment or other requirements AL (Action Level) Definitions Highest Average or Highest Single Test Result, because it occurred in the previous calendar year.ance. Because of this averaging, there are times where the Range of Detected Test Results for the calendar year is lower thapli-Some contaminants are monitored regularly throughout the year, and rolling (or moving) annual averages are used to manage com 4700 between 8:00 a.m. and 4:30 p.m., Monday through Friday.--these results, call the Minnesota Department of Health at 651We may have done additional monitoring for contaminants that are not included in the Safe Drinking Water Act. To request a co da we found any of these contaminants the last time we sampled for them, we included them in the tables below with the detection. If We sample for some contaminants less than once a year because their levels in water are not expected to change from year to y not included in the tables.s limits. Substances that we tested for but did not find are ’the levels of those contaminants and the Environmental Protection Agencyw The tables below show the contaminants we found last year or the most recent time we sampled for that contaminant. They also How to Read the Water Quality Data Tables . nesota (https://www.health.state.mn.us/communities/environment/water/factsheet/sampli ng.html)Basics of Monitoring and testing of Drinking Water in Min-s webpage ’Learn more by visiting the Minnesota Department of Health tans from substances that may be harmful to their health.eso-contaminants in small amounts. No water supply is ever completely free of contaminants. Drinking water standards protect MinnWe work with the Minnesota Department of Health to test drinking water for more than 100 contaminants. It is not unusual to d This report contains our monitoring results from January 1 to December 31, 2021. Centerville Monitoring Results 4791.---s Safe Drinking Water Hotline at 1’tential health effects can be obtained by calling the Environmental Protection Agencyo-presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminants anDrinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. T tap water.ublic regulates the amount of certain contaminants in bottled water. Bottled water must provide the same public health protection aation rtsinimdA gurD dna dooF .S.U ehT .elpoep tsom rof knird ot efas si retaw pat taht serusne sihT .retaw gniknird ni dewolla stnanim-The U.S. Environmental Protection Agency sets safe drinking water standards. These standards limit the amounts of specific co s drinking water. You can also ask for information about how you can take part in decisions that may affect water quality.’terville3232 or tpeterson@centervillemn.com if you have questions about Cen---Contact Tedd Peterson, P.W. Maintenance Tech., at 651 rces.The purpose of this report is to provide you with information on your drinking water and how to protect our precious water rents. Centerville works hard to provide you with safe and reliable drinking water that meets federal and state water quality requir fer.deep well that draws water from the Prairie Du Chien Group aqui--foot-Your drinking water comes from a groundwater source: a 187 Making Safe Drinking Water Centerville 2021 Drinking Water Report