2019 Water Utilities Consumer Confidence Report 2019 Water Utilities Consumer Confidence Report | Page 3

Table B. Unregulated Substances. Substances Expected to be in Drinking Water The City of Arlington and the State of Texas both analyze your drinking water. Any regulated substances that were detected during the last year are shown in Table A, and all are well below the established maximum contaminant levels. All water dissolves substances from the ground as it flows over and through it. Substances that may be present in raw water include: Microbes such as viruses and bacteria that come from septic systems, agricultural livestock operations and wildlife Substance Chloroform Bromodichloromethane Chlorodibromomethane Bromoform Dichloroacetic Acid Bromoacetic Acid Dibromoacetic Acid Chloroacetic Acid Trichloroacetic Acid Units Avg. ppb ppb ppb ppb ppb ppb ppb ppb ppb 3.4 3.8 4.0 1.4 3.8 0.2 1.7 0.70 0.01 Min. Max. MCL 2.3 3.6 3.1 0.8 3.0 0.09 1.1 0.59 ND 5.0 3.9 4.7 1.4 3.3 0.3 1.9 0.76 0.02 Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated Not Regulated MCLG Possible Source NE NE 60 NE NE NE NE NE 300 By-product of drinking water disinfection; not regulated individually; included in Total Trihalomethanes. By-product of drinking water disinfection; not regulated individually; included in Haloacetic Acids. Unregulated Contaminants - UCMR 4 Monitoring. Salts and metals that can be naturally occurring or the result of urban storm water runoff, industrial or domestic wastewater discharges or farming Pesticides and herbicides that may come from a variety of sources such as agriculture, urban storm water runoff or residential uses Radioactive substances that are naturally occurring Organic chemical substances including synthetic and volatile organic chemicals that are by-products of industrial processes and can also come from gas stations and urban stormwater runoff Contaminants may be found in drinking water that could cause taste, color, or odor problems but are not necessarily causes for health concerns. For more information, please call Laboratory Services at 817-575-8984. Other Substances of Interest Substance These substances are not currently regulated by EPA. The purpose of unregulated contaminant monitoring is to assist EPA in determining the occurrence of unregulated contaminants in drinking water and whether future regulation is warranted. Units Avg Min Max Total: Alkalinity Hardness Hardness ppm ppm grains/gal 97.5 111 6.5 77.8 82 4.8 128 154 9.0 Calcium ppm 37 30 52 Sodium ppm 26.0 20.3 31.8 Magnesium ppm 5.00 3.91 6.09 Chloride Total Dissolved Solids pH ppm 16 13 25 ppm 205 157 268 pH units 8.02 7.53 8.56 Although not currently regulated by the EPA, the City of Arlington has been collecting data for the EPA about these compounds in our water supply - the first step in determining whether they should be regulated. Substance HAA5 HAA6Br HAA9 Manganese Bromide TOC Water Source Units Avg. Drinking Drinking Drinking Drinking Raw Raw ppb ppb ppb ppb ppb ppm 5.83 5.79 9.81 1.63 92.8 4.42 Min. Max. Possible Source 3.00 3.66 5.66 0.46 64.4 4.35 8.57 9.09 14.56 2.80 133 4.49 By-product of drinking water disinfection. Naturally present in the environment Testing Before Your Tap Arlington Water Utilities tests drinking water throughout the water treatment process and at locations all over the city. In 2019, the Laboratory: tested collected >120 7,010 taps each samples month performed 16,117 tests monitored 277 analytes Data in this report was collected between January 1, 2019 and December 31, 2019, unless another time frame is noted. Arlington Water Utilities Lab Staff Spotlight 11 145 8 Full-time Combined TCEQ and Part- years of Water time staff lab Operator members experience licenses (2 Class A, 3 B, 1 C and 2 D) 10 3 Master’s degrees 5 Bachelor’s degrees 3