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March 02, 2022 CCR 2021 GILBERT WATER SUPPLY PWSID: 8531083 Page 1 2021 WATER QUALITY REPORT FOR GILBERT WATER SUPPLY 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 Copper (ppm) AL=1.3 (1.3) 90th 0.86 (0.1 - 0.96) 2021 No Corrosion of household plumbing systems; Erosion of natural deposits; Leaching from wood preservatives Lead (ppb) AL=15 90th 0.00 (ND - 2) 2021 No Corrosion of household plumbing systems; erosion of natural deposits 950 - DISTRIBUTION SYSTEM Chlorine (ppm) MRDL=4.0 RAA 3.1 (2.04 - 4.2) 03/31/2021 No Water additive used to control microbes Total Trihalomethanes (ppb) [TTHM] 80 (N/A) SGL 87.00 07/28/2021 No By-products of drinking water chlorination Total Haloacetic Acids (ppb) [HAA5] 60 (N/A) SGL 66.00 07/28/2021 No By-products of drinking water disinfection Nitrite [as N] (ppm) 1 SGL 0.0190 (ND - 0.0190) 2021 No Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits 02 - WL#3/4 AT PLT AFTR Arsenic (ppb) 10 SGL 5.00 04/06/2021 No Erosion of natural deposits; Runoff from orchards; Runoff from glass and electronic production wastes Sodium (ppm) N/A (N/A) SGL 144 04/06/2021 No Erosion of natural deposits; Added to water during treatment process Nitrate [as N] (ppm) 10 (10) SGL 2.4570 (1.6100 - 2.4570) 2021 No Runoff from fertilizer use; Leaching from septic tanks, sewage; Erosion of natural deposits Nitrite [as N] (ppm) 1 SGL 0.0190 (ND - 0.0190) 2021 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 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. 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. ---PAGE BREAK--- March 02, 2022 CCR 2021 GILBERT WATER SUPPLY PWSID: 8531083 Page 2 • 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 - The level of a drinking water disinfectant below which there is no known or expected risk to health. 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 and other microbial contaminants are available from the Safe Drinking Water Hotline ([PHONE REDACTED]). If present, elevated levels of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing. GILBERT WATER SUPPLY is responsible for providing high quality drinking water, but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure by flushing your tap for 30 seconds to 2 minutes before using water for drinking or cooking. If you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods and steps you can take to minimize exposure is available from the Safe Drinking Water Hotline or at http://www.epa.gov/safewater/lead. OTHER VIOLATIONS In October 2021 we failed to monitor for Haloacetic Acids (HAA5). Adverse health effects, if any, are not known. Monitoring procedures have been corrected to avoid future violations. In October 2021 we failed to monitor for Total THM. Adverse health effects, if any, are not known. Monitoring procedures have been corrected to avoid future violations. SOURCE WATER ASSESSMENT INFORMATION This water supply obtains its water from the buried sand and gravel of the Buried Sand and Gravel aquifer. The Buried Sand and Gravel aquifer was determined to have low susceptibility to contamination because the characteristics of the aquifer and overlying materials provide natural protection from contaminants at the land surface. The Buried Sand and Gravel well will have low susceptibility 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 [PHONE REDACTED] . CONTACT INFORMATION For questions regarding this information or how you can get involved in decisions regarding the water system, please contact GILBERT WATER SUPPLY at [PHONE REDACTED] or City Hall at [PHONE REDACTED]..