2025 Annual Drinking Water Quality Report City of York #4610001 We are pleased to present to you this year’s Annual Water Quality Report. This report is designed to inform you about the water quality and services we deliver to you every day. Our constant goal is to provide you with a safe and dependable supply of drinking water. We want you to understand the efforts we make to continually improve the water treatment process and protect our water resources. We are committed to ensuring the quality of your water. : Our Source Water Assessment Plan is available upon request. Please contact Matt Kennedy at 803-684-2341 to arrange to review this document. The City of York purchased on average 1.5 million gallons of water per day from Rock Hill for the year, 2023. York County receives their water supply from the City of Rock Hill, who draws their water from the Catawba River. The City of York ceased operating its 93-year- old water treatment plant on September 30, 2019. Beginning October 1, 2019, the City of York began purchasing essentially all its water from Rock Hill. The City of York routinely monitors for constituents in your drinking water according to Federal and State laws. The table shows the results of our monitoring for the period of January 1 to December 31, 2025. Definitions: The following tables contain scientific terms and measures, some of which may require explanation. ppm: parts per million, or milligrams per liter (mg/L) ppb: parts per billion, or micrograms per liter (µg/L) NA: not applicable ND: Not detected NR: Monitoring not required but recommended. MCLG: Maximum Contaminant Level Goal: 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. MCL: Maximum Contaminant Level: The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to MCLGs as feasible using the best available treatment technology. TT: Treatment Technique: A required process intended to reduce the level of a contaminant in drinking water. AL: Action Level: The concentration of a contaminant which, if exceeded, triggers treatment or other requirements which a water system must follow. Variances and Exemptions: State or EPA permission not to meet an MCL or a treatment technique under certain conditions. MRDLG: Maximum residual disinfection level goal. 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. MRDL: Maximum residual disinfectant level. 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. MNR: Monitored Not Regulated MPL: State Assigned Maximum Permissible Level Test Results City of York (SC4610001 Sites Violation 90th Unit Contaminant Y/N Percentile Measurement Action over Level action Likely Source of Contamination level Corrosion of household Copper 2023 N 0.054 Range 0-0.068 ppm 1.3 0 plumbing systems; erosion of natural deposits; leaching from wood preservatives Disinfection & Disinfection Violation Level Unit By-Products Y/N Detected Measurement MCLG MCL Likely Source of Contamination 1.0 Chlorine (2025) N Range ppm MRDLG MRDL = r additive used to control microbes 0.98-1.1 = 4 4 Wate 3 Haloacetic acids (HAAs) 28 (2025) N Range ppb 60 N/a By-product of drinking water disinfectant 3.4-35.3 TTHM 77 [Total trihalomethanes] N Range ppb 80 N/a By-product of drinking water chlorination (2025) 23.3-90.9 Rock Hill Water System (SC4610002) Fluoride 0.64 Erosion of natural deposits; water (2025) N Range 0.64- ppm 4 4 additive which promotes strong teeth; 0.64 discharge from fertilizer and aluminum factories Nitrate 0.43 Runoff from fertilizer use; leaching (2025) N Range 0.43- ppm 10 10 from septic tanks, sewage; erosion 0.43 of natural deposits Sodium **Unregulated Contaminant (2025) N 5.2 ppm N/A N/A Naturally Occurring Radioactive Violation Level Unit Contaminants Y/N Detected Measurement MCLG MCL Likely Source of Contamination Combined Radium 1.41 226/228 (2025) N Range 0 5 pCi/L Erosion of natural deposits 0-1.41 Gross Alpha excluding 3.11 radon N Range 0 15 pCi/L Erosion of natural deposits and uranium (2025) 0-3.11 Turbidity Limit (Treatment Technique) Level Detected Violation Likely Source of Contamination Highest single measurement 1 NTU 0.030 NTU No Soil runoff Lowest monthly % meeting limit 0.3 NTU 100.000% No Soil runoff Total Organic Carbon The percentage of Total Organic Carbon (TOC) removal was measured each month and the system met all TOC removal requirements set, unless a TOC violation is noted in the violations section. Coliform Bacteria Maximum Total Coliform Fecal Coliform or Total No. of Contaminant Level Maximum Highest No. E. Coli Maximum Positive E. Goal Contaminant of Positive Contaminant Coli or Fecal Violation Likely Source of Contamination Level Level Coliform Samples 5% of monthly 0 samples are 2.300 0 N Naturally present in the positive environment. UCMR5 Unregulated contaminants are those for which U.S. EPA has not established drinking water standards. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of these contaminants in drinking water and whether future regulation is warranted. In 2025 the City of Rock Hill participated in the fifth round of the Unregulated Contaminant Monitoring Rule (UCMR 5). For a copy of the results please call us at 803-322-7494. Information about these contaminants can be found at https://www.epa.gov/dwucmr/fifth-unregulated-contaminant-monitoring- rule and https://www.epa.gov/dwucmr/datasummary-fifth-unregulated-contaminant-monitoring-rule Table of Unregulated Contaminants Contaminants (Units) Sample Year Average Level Found Range of Detection PFHxA (ppb) 2025 4 3.7-4.4 PFPeA (ppb) 2025 4.575 3.9-5.9 MCL’s are set at very stringent levels. To understand the possible health effects described for many regulated constituents, a person would have to drink 2 liters of water every day at the MCL level for a lifetime to have a one-in-a-million chance of having the described health effect . 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, such as viruses and bacteria, which may come from sewage treatment plants, septic systems, agricultural livestock operations, and wildlife. - Inorganic contaminants, such as 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. - Pesticides and herbicides, which may come from a variety of sources such as agriculture, urban storm water runoff, and residential uses. - Organic chemical contaminants, including synthetic and volatile organic chemicals, which are by-products of industrial processes and petroleum production, and can also come from gas stations, urban storm water runoff, and septic systems. - Radioactive contaminants, which can be naturally occurring or be the result of oil and gas production and mining activities. 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 poses a health risk. More information about contaminants and potential health effects can be obtained by calling the EPAs Safe Drinking Water Hotline at (800) 426-4791. In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the amount of certain contaminants in water provided by public water systems. FDA regulations establish limits for contaminants in bottled water, which must provide the same protection for public health. 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 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. The City of York is responsible for providing high quality drinking water and removing lead pipes but cannot control the variety of materials used in plumbing components in your home. You share the responsibility for protecting yourself and your family from the lead in your home plumbing. You can take responsibility by identifying and removing lead materials within your home plumbing and taking steps to reduce your family’s risk. Before drinking tap water, flush your pipes for several minutes by running your tap, taking a shower, doing laundry or a load of dishes. You can also use a filter certified by an American National Standards Institute accredited certifier to reduce lead in drinking water. If you are concerned about lead in your water and wish to have your water tested, contact the City of York at 803-684-2341. Information on lead in drinking water, testing methods, and steps you can take to minimize exposure is available at http://www.epa.gov/safewater/lead. A lead service line inventory was completed throughout our system, in 2024. For more information on this inventory please the City of York at 803-684-2341 If you have any questions concerning this report or your water utility, please contact Utilities Director, Matt Kennedy at 803-684- 2341. We want our valued customers to be informed concerning their water utility. If you want to learn more, please attend any of our regularly scheduled Council meetings. They are held on the first Tuesday of each month at 6:00 p.m. at the City of York, City Hall. “We ask that all our customers help us protect our water sources, which are the heart of our community, our way of life and our children’s future”.