MERIDIAN SERVICE MD 2025 Drinking Water Quality Report Covering Data For Calendar Year 2024 Public Water System ID: CO0121455 Esta es información importante. Si no la pueden leer, necesitan que alguien se la traduzca. We are pleased to present to you this year’s water quality report. Our constant goal is to provide you with a safe and dependable supply of drinking water. Please contact RUSS MILLS at 719-684-4761 with any questions or for public participation opportunities that may affect water quality. Please see the water quality data from our wholesale system(s) (either attached or included in this report) for additional information about your drinking water. General Information All 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 the water poses a health risk. More information about contaminants and potential health effects can be obtained by calling the Environmental Protection Agency’s Safe Drinking Water Hotline (1-800-426-4791) or by visiting epa.gov/ground-water-anddrinking-water. Some people may be more vulnerable to contaminants in drinking water than the general population. Immunocompromised 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 of infections. These people should seek advice about drinking water from their health care providers. For more information about contaminants and potential health effects, or to receive a copy of the U.S. Environmental Protection Agency (EPA) and the U.S. Centers for Disease Control (CDC) guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and microbiological contaminants call the EPA Safe Drinking Water Hotline at (1-800-426-4791). Contaminant Information The sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity. Contaminants that may be present in source water include: • Microbial contaminants: viruses and bacteria that may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. • Inorganic contaminants: salts and metals, which can be naturally-occurring or result from urban storm water runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming. MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 2 of 12 • Pesticides and herbicides: may come from a variety of sources, such as agriculture, urban storm water runoff, and residential uses. • Radioactive contaminants: can be naturally occurring or be the result of oil and gas production and mining activities. • Organic chemical contaminants: including synthetic and volatile organic chemicals, which are byproducts of industrial processes and petroleum production, and also may come from gas stations, urban storm water runoff, and septic systems. In order to ensure that tap water is safe to drink, the Colorado Department of Public Health and Environment prescribes regulations limiting the amount of certain contaminants in water provided by public water systems. The Food and Drug Administration regulations establish limits for contaminants in bottled water that must provide the same protection for public health. Lead in Drinking Water 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. We are 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 formula, flush your pipes for several minutes. 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 RUSS MILLS at 719-684-4761. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available at epa.gov/safewater/lead. Service Line Inventory New state and federal laws require us to inventory all water service lines in our service area to classify the material. A service line is the underground pipe that carries water from the water main, likely in the street, into your home or building. If you would like to view a copy of our service line inventory or have questions about the material of your service line, contact RUSS MILLS at 719-684-4761. MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 3 of 12 Source Water Assessment and Protection (SWAP) The Colorado Department of Public Health and Environment may have provided us with a Source Water Assessment Report for our water supply. For general information or to obtain a copy of the report please visit wqcdcompliance.com/ccr. The report is located under “Guidance: Source Water Assessment Reports”. Search the table using our system name or ID, or by contacting RUSS MILLS at 719-684-4761. The Source Water Assessment Report provides a screening-level evaluation of potential contamination that could occur. It does not mean that the contamination has or will occur. We can use this information to evaluate the need to improve our current water treatment capabilities and prepare for future contamination threats. This can help us ensure that quality finished water is delivered to your homes. In addition, the source water assessment results provide a starting point for developing a source water protection plan. Potential sources of contamination in our source water area are listed below. Please contact us to learn more about what you can do to help protect your drinking water sources, any questions about the Drinking Water Quality Report, to learn more about our system, or to attend scheduled public meetings. We want you, our valued customers, to be informed about the services we provide and the quality water we deliver to you every day. Our Water Sources Sources (Water Type - Source Type) Potential Source(s) of Contamination WELL GA-1 (Groundwater-Well) WELL GA-2 (Groundwater-Well) WELL GALV-2 (Groundwater-Well) PURCHASED FROM CO0121930 WOODMEN HILLS (Groundwater-Consecutive Connection) WELL LFH-7 (Groundwater-Well) WELL LFH-8 (Groundwater-Well) WELL A1 (Groundwater-Well) WELL A2 (Groundwater-Well) WELL A4 (Groundwater-Well) WELL A9 (Groundwater-Well) WELL LFH1 (Groundwater-Well) WELL LFH2 (Groundwater-Well) WELL LFH3 (Groundwater-Well) WELL LFH3 LATIGO (Groundwater-Well) WELL LFH4 (Groundwater-Well) WELL LFH9 (Groundwater-Well) WELL A6 (Groundwater-Well) WELL LFH-6 (Groundwater-Well) WELL D-3 (Groundwater-Well) WELL GLFH-1 (Groundwater-Well) WELL GLFH-2 (Groundwater-Well) There is no SWAP report, please contact RUSS MILLS at 719-684-4761 with questions regarding potential sources of contamination. MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 4 of 12 WELL GALV-1 (Groundwater-Well) WELL LFH-5 (Groundwater-Well) Terms and Abbreviations • Maximum Contaminant Level (MCL) − The highest level of a contaminant allowed in drinking water. • Treatment Technique (TT) − A required process intended to reduce the level of a contaminant in drinking water. • Health-Based − A violation of either a MCL or TT. • Non-Health-Based − A violation that is not a MCL or TT. • Action Level (AL) − The concentration of a contaminant which, if exceeded, triggers treatment and other regulatory requirements. • 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. • 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. • 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. • Violation (No Abbreviation) − Failure to meet a Colorado Primary Drinking Water Regulation. • Formal Enforcement Action (No Abbreviation) − Escalated action taken by the State (due to the risk to public health, or number or severity of violations) to bring a noncompliant water system back into compliance. • Variance and Exemptions (V/E) − Department permission not to meet a MCL or treatment technique under certain conditions. • Gross Alpha (No Abbreviation) − Gross alpha particle activity compliance value. It includes radium-226, but excludes radon 222, and uranium. • Picocuries per liter (pCi/L) − Measure of the radioactivity in water. • Nephelometric Turbidity Unit (NTU) − Measure of the clarity or cloudiness of water. Turbidity in excess of 5 NTU is just noticeable to the typical person. • Compliance Value (No Abbreviation) – Single or calculated value used to determine if regulatory contaminant level (e.g. MCL) is met. Examples of calculated values are the 90th Percentile, Running Annual Average (RAA) and Locational Running Annual Average (LRAA). • Average (x-bar) − Typical value. • Range (R) − Lowest value to the highest value. • Sample Size (n) − Number or count of values (i.e. number of water samples collected). MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 5 of 12 • Parts per million = Milligrams per liter (ppm = mg/L) − One part per million corresponds to one minute in two years or a single penny in $10,000. • Parts per billion = Micrograms per liter (ppb = ug/L) − One part per billion corresponds to one minute in 2,000 years, or a single penny in $10,000,000. • Not Applicable (N/A) – Does not apply or not available. • Level 1 Assessment – A study of the water system to identify potential problems and determine (if possible) why total coliform bacteria have been found in our water system. • Level 2 Assessment – A very detailed study of the water system to identify potential problems and determine (if possible) why an E. coli MCL violation has occurred and/or why total coliform bacteria have been found in our water system on multiple occasions. Detected Contaminants MERIDIAN SERVICE MD routinely monitors for contaminants in your drinking water according to Federal and State laws. The following table(s) show all detections found in the period of January 1 to December 31, 2024 unless otherwise noted. The State of Colorado requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants are not expected to vary significantly from year to year, or the system is not considered vulnerable to this type of contamination. Therefore, some of our data, though representative, may be more than one-year-old. Violations and Formal Enforcement Actions, if any, are reported in the next section of this report. Note: Only detected contaminants sampled within the last 5 years appear in this report. If no tables appear in this section, then no contaminants were detected in the last round of monitoring. MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 6 of 12 Disinfectants Sampled in the Distribution System TT Requirement: At least 95% of samples per period (month or quarter) must be at least 0.2 ppm OR If sample size is less than 40 no more than 1 sample is below 0.2 ppm Typical Sources: Water additive used to control microbes Disinfectant Name Time Period Results Number of Samples Below Level Sample Size TT Violation MRDL Chlorine December, 2024 Lowest period percentage of samples meeting TT requirement: 100% 0 10 No 4.0 ppm Lead and Copper Sampled in the Distribution System Lead and Copper Individual Sample Results Contaminant Name Time Period Tap Sample Range Low – High 90th Percentile Sample Size Unit of Measure 90th Percentile AL Sample Sites Above AL 90th Percentile AL Exceedance Typical Sources Copper 08/14/ 2024 to 0.008 to 0.154 0.09 40 ppm 1.3 0 No Corrosion of household plumbing MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 7 of 12 Lead and Copper Sampled in the Distribution System Lead and Copper Individual Sample Results Contaminant Name Time Period Tap Sample Range Low – High 90th Percentile Sample Size Unit of Measure 90th Percentile AL Sample Sites Above AL 90th Percentile AL Exceedance Typical Sources 08/22/ 2024 systems; Erosion of natural deposits Copper 03/05/ 2024 to 03/12/ 2024 0.004 to 0.103 0.04 40 ppm 1.3 0 No Corrosion of household plumbing systems; Erosion of natural deposits Disinfection Byproducts Sampled in the Distribution System Name Year Average Range Low – High Sample Size Unit of Measure MCL MCLG MCL Violation Typical Sources Total Haloacetic Acids (HAA5) 2024 3.3 3.3 to 3.3 1 ppb 60 N/A No Byproduct of drinking water disinfection Total Trihalometha nes (TTHM) 2024 40.1 40.1 to 40.1 1 ppb 80 N/A No Byproduct of drinking water disinfection — MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 8 of 12 Radionuclides Sampled at the Entry Point to the Distribution System Contaminant Name Year Average Range Low – High Sample Size Unit of Measure MCL MCLG MCL Violation Typical Sources Gross Alpha 2024 3.7 3.7 to 3.7 1 pCi/L 15 0 No Erosion of natural deposits Combined Radium 2024 0.5 0.5 to 0.5 1 pCi/L 5 0 No Erosion of natural deposits Inorganic Contaminants Sampled at the Entry Point to the Distribution System Contaminant Name Year Average Range Low – High Sample Size Unit of Measure MCL MCLG MCL Violation Typical Sources Barium 2024 0.01 0.01 to 0.01 1 ppm 2 2 No Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 9 of 12 Inorganic Contaminants Sampled at the Entry Point to the Distribution System Contaminant Name Year Average Range Low – High Sample Size Unit of Measure MCL MCLG MCL Violation Typical Sources Chromium 2024 2 2 to 2 1 ppb 100 100 No Discharge from steel and pulp mills; erosion of natural deposits Fluoride 2024 0.91 0.91 to 0.91 1 ppm 4 4 No Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories Selenium 2024 2 2 to 2 1 ppb 50 50 No Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 10 of 12 Volatile Organic Contaminants Sampled at the Entry Point to the Distribution System Contaminant Name Year Average Range Low – High Sample Size Unit of Measure MCL MCLG MCL Violation Typical Sources Xylenes 2024 0.6 0 to 1.7 4 ppb 10,000 10,000 No Discharge from petroleum factories; discharge from chemical factories Secondary Contaminants** **Secondary standards are non-enforceable guidelines for contaminants that may cause cosmetic effects (such as skin, or tooth discoloration) or aesthetic effects (such as taste, odor, or color) in drinking water Contaminant Name Year Average Range Low – High Sample Size Unit of Measure Secondary Standard Sodium 2024 156.2 156.2 to 156.2 1 ppm N/A MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 11 of 12 Unregulated Contaminants*** EPA has implemented the Unregulated Contaminant Monitoring Rule (UCMR) to collect data for contaminants that are suspected to be present in drinking water and do not have health-based standards set under the Safe Drinking Water Act. EPA uses the results of UCMR monitoring to learn about the occurrence of unregulated contaminants in drinking water and to decide whether or not these contaminants will be regulated in the future. We performed monitoring and reported the analytical results of the monitoring to EPA in accordance with its Unregulated Contaminant Monitoring Rule (UCMR). Once EPA reviews the submitted results, the results are made available in the EPA’s National Contaminant Occurrence Database (NCOD) (epa.gov/dwucmr/national-contaminantoccurrence-database-ncod) Consumers can review UCMR results by accessing the NCOD. Contaminants that were detected during our UCMR sampling and the corresponding analytical results are provided below. Contaminant Name Year Average Range Low – High — Sample Size Unit of Measure MERIDIAN SERVICE MD, PWS ID: CO0121455 2025 CCR Page 12 of 12 Unregulated Contaminants*** EPA has implemented the Unregulated Contaminant Monitoring Rule (UCMR) to collect data for contaminants that are suspected to be present in drinking water and do not have health-based standards set under the Safe Drinking Water Act. EPA uses the results of UCMR monitoring to learn about the occurrence of unregulated contaminants in drinking water and to decide whether or not these contaminants will be regulated in the future. We performed monitoring and reported the analytical results of the monitoring to EPA in accordance with its Unregulated Contaminant Monitoring Rule (UCMR). Once EPA reviews the submitted results, the results are made available in the EPA’s National Contaminant Occurrence Database (NCOD) (epa.gov/dwucmr/national-contaminantoccurrence-database-ncod) Consumers can review UCMR results by accessing the NCOD. Contaminants that were detected during our UCMR sampling and the corresponding analytical results are provided below. Contaminant Name Year Average Range Low – High Sample Size Unit of Measure ***More information about the contaminants that were included in UCMR monitoring can be found at: drinktap.org/WaterInfo/Whats-in-My-Water/Unregulated-Contaminant-Monitoring-Rule-UCMR. Learn more about the