2025 WATER QUALITY REPORT FOR ADEL MUNICIPAL WATER WORKS

2025 WATER QUALITY REPORT FOR ADEL MUNICIPAL WATER WORKS This report contains important information regarding the water quality in our water system. The source of our water is groundwater. Our water quality testing shows the following results: CONTAMINANT MCL - (MCLG) Compliance Date Violation Source Type Value & (Range) Yes/No Total Trihalomethanes (ppb) [TTHM] 80 (N/A) LRAA 25.00 (25 - 25) 09/30/2025 No By-products of drinking water chlorination Total Haloacetic Acids (ppb) [HAA5] 60 (N/A) LRAA 14.00 (14 - 14) 09/30/2025 No By-products of drinking water disinfection Copper (ppm) AL=1.3 (1.3) 90th 0.216 (0.0141 - 0.291) 2024 No Corrosion of household plumbing systems; Erosion of natural deposits; Leaching from wood preservatives Lead (ppb) AL=15 (0) 90th ND 2024 No Corrosion of household plumbing systems; erosion of natural deposits 950 - DISTRIBUTION SYSTEM Chlorine (ppm) MRDL=4.0 (MRDLG=4.0) RAA 0.8 (0.35 - 1.1) 12/31/2025 No Water additive used to control microbes 02 - WELLS 2-8 AFTER TREATMENT Barium (ppm) 2 (2) SGL 0.117 10/23/2024 No Discharge of drilling wastes; Discharge from metal refineries; Erosion of natural deposits Fluoride (ppm) 4 (4) RAA 0.34 (0.200 - 0.730) 03/31/2025 No Water additive which promotes strong teeth; Erosion of natural deposits; Discharge from fertilizer and aluminum factories Selenium (ppb) 50 (50) SGL 1.10 10/23/2024 No Discharge from petroleum and metal refineries; Erosion of natural deposits; Discharge from mines Sodium (ppm) N/A (N/A) SGL 18.6 07/30/2025 No Erosion of natural deposits; Added to water during treatment process Nitrate [as N] (ppm) 10 (10) SGL 0.900 2025 No Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits Note: Contaminants with dates indicate results from the most recent testing done in accordance with regulations. DEFINITIONS • Maximum Contaminant Level (MCL) – The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology. • Maximum Contaminant Level Goal (MCLG) -- The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety. • ppb -- parts per billion. • ppm -- parts per million. • pCi/L – picocuries per liter • N/A – Not applicable • ND -- Not detected • RAA – Running Annual Average • Treatment Technique (TT) – A required process intended to reduce the level of a contaminant in drinking water. • Action Level (AL) – The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow. • Maximum Residual Disinfectant Level Goal (MRDLG) - The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants. • Maximum Residual Disinfectant Level (MRDL) - The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants. • SGL – Single Sample Result • RTCR – Revised Total Coliform Rule • NTU – Nephelometric Turbidity Units GENERAL INFORMATION Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water posed a health risk. More information about contaminants or potential health effects can be obtained by calling the Environmental Protection Agency's Safe Drinking Water Hotline (800-426-4791). Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or other immune system disorders, some elderly, and infants can be particularly at risk from infections. These people should seek advice about drinking water from their health care providers. EPA/CDC guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (800-426-4791). Lead can cause serious health effects in people of all ages, especially pregnant people, infants (both formula-fed and breastfed), and young children. Lead in drinking water is primarily from materials and parts used in service lines and in home plumbing. Our water supply is responsible for providing high quality drinking water and removing lead pipes but cannot control the variety of materials used in the plumbing in your home. Because lead levels may vary over time, lead exposure is possible even when your tap sampling results do not detect lead at one point in time. You can help protect yourself and your family by identifying and removing lead materials within your home plumbing and taking steps to reduce your family's risk. Using a filter, certified by an American National Standards Institute accredited certifier to reduce lead, is effective in reducing lead exposures. Follow the instructions provided with the filter to ensure the filter is used properly. Use only cold water for drinking, cooking, and making baby formula. Boiling water does not remove lead from water. Before using tap water for drinking, cooking, or making baby formulas, flush your pipes for several m inutes. You can do this by running your tap, taking a shower, doing laundry or a load of dishes. If you have a lead service line or galvanized requiring replacement service line, you may need to flush your pipes for a longer period. If you are concerned about lead in your water and wish to have your water tested, contact ADEL MUNICIPAL WATER WORKS at 515-993-4525. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available at https://www.epa.gov/safewater/lead. Lead tap sampling data can be found in the Iowa Drinking Water Data Portal: https://programs.iowadnr.gov/iowadrinkingwater Our water supply has completed a service line inventory. Please contact us for information regarding the inventory and how you can access the results. SOURCE WATER ASSESSMENT INFORMATION This water supply obtains its water from the sand and gravel of the Alluvial aquifer. The Alluvial aquifer was determined to be highly susceptible to contamination because the characteristics of the aquifer and overlying materials provide little protection from contamination at the land surface. The Alluvial wells will be highly susceptible to surface contaminants such as leaking underground storage tanks, contaminant spills, and excess fertilizer application. A detailed evaluation of your source water was completed by the Iowa Department of Natural Resources, and is available from the Water Operator at 515-993-4525 . CONTACT INFORMATION For questions regarding this information or how you can get involved in decisions regarding the water system, please contact ADEL MUNICIPAL WATER WORKS at 515-993-4525. June 4 2026 LIOW0528852