􀁾􀀠􀁾􀀠􀁾􀀠>-l >(Il @􀁾􀀠(Il is:: I:'l1 t-< t-< i Ii 􀁉􀁾􀀠Q.8 Z , P 􀁾􀀠gJ ...... ..C). l City of Dallas April 1, 2002 Mr. Mike Murphy Director of Public Works Town of Addison P.O. Box 9010 Addison, Texas 75001-9010 Dear Mr. Murphy: Enclosed is Dallas Water Utilities water quality information for calendar year 2001. We are providing this information for your use in developing your own Consumer Confidence Report to your customers as required in Environmental Protection Agency 40 CFR Parts 141 and 142 National Primary Drinking Water Regulation: Consumer Confidence Reports; Final Rule. You may also refer to Title 30 TAC, Chapter 290.271 • 275, Subchapter H. As the data shows, Dallas water quality in 2001 met or was better than all state and federal water quality reqUirements. The enclosed tables represent the detected characteristics that EPA requires to be included in these reports. Although the list is small, Dallas tests for more than 180 constituents. The constituents not listed either were not detected in Dallas drinking water in 2001 or are not required to be listed in this report. If you would like to have a copy of the complete list of constituents for which Dallas tests its drinking water, please contact Wholesale Services Manager Randy Stalnaker at 214/670-5887. Please bear in mind that, as a retail water supplier, you are responsible for producing your own Consumer Confidence Report for your customers. Your report must include a contact telephone number at your utility and other information unique to your community. Your report must reflect the quality of your system's water in 2001. If you have other water sources in addition to Dallas Water Utilities, your water quality data would not be identical to the information enclosed. Even if Dallas Water Utilities is your only water source, your report needs to include the results of the testing the state and federal govemments require you to conduct in your distribution system or at the customer's tap, such as chlorine residual, trihalomethanes, total coliform, fecal coliform, lead and copper. For more details about the required contents of your your report, please see the EPA regulation referred to in the first paragraph of this letter. For answers to specific questions, you may contact the Texas Natural Resource Conservation Commission Water Utilities Division at 512/239-6045. If you have any questions about the enclosed, please contact Randy Stalnaker at 214/670-5887. 􀁓􀁩􀁮􀁃􀁥􀁲􀁥􀁉􀁙􀀧􀁾􀀠/4J{! Mike Rickman Assistant Director -Water Operations enclosure c: Jim Pierce, Assistant Director of Public Works Water Utilities Department City Hall.1500 Marilla, 4AN. Dallas. Texas 75201 ·21411l70-3146 A city utility providing regional water and wastewater services vital to public health and safety. ----2001 Dallas Water Utilities Water Quality Report Water quality monitoring results As the charts show. the levels of contaminants in Dallas water meet or are better than the amounts allowed by law, The charts list contaminants detected in Dallas drinking water in 2001 and the amounts allowed by the state and federal governments (maximum contaminant level), Definitions of terms are listed below, Dallas regularly tests drinking water for more than 180 contaminants. About 50.000 tests each month are conducted on Dallas water to ensure that it is clean and meets all water quality requirements, Terms used in this report: Action Level (AL) -The concentration of a contaminant which. if reached. triggers treatment or other requirements which a water system must follow. Maximum Contaminant Level (MCl) The highest level of a contaminant allowed in drinking water, MCLs are set as close to the MCLCs 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. MCLCs allow for a margin of safety. mremlyear -Millerems per year (measure of radiation absorbed by the body). ND -Not detected. Nephelometric Turbidity Units (NTIJ) • Measure of turbidity in water. ppm . Parts per million. One part per million equals one packet of artificial sweetener sprinkled into 250 gallons of iced tea, pCiIL -Pico-curies per liter (a measure of radioactivity) , ppb -Parts per bllllon. One part per billion is equal to one packet of artificial sweetener sprinkled into an Olympic-size swimming pool. Regulated Characteristics Detected Inorganic C MaKimwn Maximum Conlaminanl Contamlnanl • Total i Trihalomethanes (Ppb) o Turbidity -plants NIA eFnuents. NTU t 50 pCiIL = 4 mremlyear 100' 43,1 2.6 -87,5 Treatment Requirements 0.04 -0.20 By-prOduct of drinking water chlorination Soil runoff • MCL is based on average offour quarterly samples in the distribution system. Level Goal level Conlaminanl (MCLG) (MCl) Amount Detected Average Range Possible Source I Barium (ppm) 2 2 0.030 0.Q18 -0.031 Erosion of natural posits; Discharge drilling wastes metal refineries -fluoride (ppm) 4 --'C"-,-..... Lead (ppb) • 0 ____M _____ Copper (ppm) 1.3 Nitrate as 10 Nitrogen (ppm) Nitrite as 1 I Nitrogen (ppm) .4 0,67 AL =151 ND-.---1._-AL =1.3 0.014 10 0.60 1 om 0.60 -0.10 ------c-ND -11 de of or W pr ater additive to omote strong teeth CO r----rND -0.043 Sa --0,12-0,82 R us se se -!TosiOn-of I usehold plumbing 􀀭􀁭􀁾a-s lead ! unoff from fertilizer e; Leaching from ptic tanks. wage. erosion of turalll_􀁾􀁾􀁾􀁟􀀭􀀭􀀻􀀮na ND -0.03 Same as nitrate Detected Organic Contaminants Atrazine (ppb) 3 0.44 0,20 -0.11 Herbicide runoff 􀁉􀀭􀀭􀁾􀁾􀁾􀁲􀀭􀀫􀀭􀀭􀁾􀁲􀀭􀀭􀁾􀀭􀀭􀀭􀀭􀀭􀀭􀁾􀂷􀀠 Simazine (ppb) 4 0,34 0.l5 -0.42 Herbicide runoff Total Coliform Bacteria 8eta Emitters (pCilLlt Detected Microbial Contaminants Naturally present in5%01 the environment I samples Detected Radioactive Contaminants 60 0,17 ND -0,50 IDecay of natural and man-mede deposits ! DiSinfection By-Products 0.34% 0% -0.87%o montilly Treatment Technique ('IT) -A reqUired process intended to reduce the level of a contaminant in drinking water, Turbidity -A measure of the clarity of drinking water. The lower the turbidity, the better. March 27. 2002 I Cryptosporidium During 2001, Dallas continued monthly testing for cryptosporidium in both untreated and treated water. DWU began monitoring for cryptosporidium in 1993, It has been found only in the untreated water supply. Cryptosporidium has not been found in Dallas' treated drinking water. To protect your drinking water, Dallas works to protect the watershed from contamination and optimizes treatment processes. Although Dallas' water treatment process removes cryptosporidium. immuno-compromised persons should consult their doctors regarding appropriate precautions to take to avoid infection. Cryptosporidium is a tiny intestinal parasite found naturally in the environment. It is spread by human and animal waste. If ingested, it can cause flu-like symptoms. Some of the ways cryptosporidium can be spread include drinking contaminated water, eating contaminated food that is raw or undercooked, exposure to the feces of infected individuals or animals (such as changing diapers without washing hands afterward), or exposure to contaminated surfaces. Not everyone exposed to the organism becomes ill. Total Alkalinity (ppm) 77 48 -106 Natural contaminant Detected Volatile Organic Contaminants Chloromethane (ppb) 0,6 ND -3.4 Chlorine reaction -with untreated water Acetone (ppb) -5.4 ND -18.0 Ozone reaction with untreated water 􀁣􀁾􀁡􀁮􀁯􀁧􀁥􀁮􀀠Chloride ppb) 0.4 ND -2.1 Ozone reaction with untreated water Detected Disinfection By-Products (DBPs) Total Haloacetic Acid (HAA5) Annual Running Average (ppb) in Distribution System 16,3 6,0 -34,0 Bromate (ppb) 2.52 ND -5.6 ,. Unregulated characteristics do not have MeL or MCLG. By-product of drinking water chlorination Ozonation by-product To request more information on cryptosporidium, please call the U.S. EPA's Safe Drinking Water Hotline (1/800/426-4791). All drinking water may contain contaminants 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 U.S. EPA's Safe Drinking Water Hotline (1/800/426-4791). In order to ensure that tap water is safe to drink, U.S. EPA prescribes regulations which limit the amount of certain contaminants in water provided by public water systems. U.S. Food and Drug Administration regulations establish limits for contaminants in bottled water which must provide the same protection for public health. Dallas water sources Dallas uses surface water from six sources: the Elm Fork of the Trinity River and Lakes Ray Roberts, Lewisville, Grapevine, Ray Hubbard and Tawakoni. In addition, Dallas has water rights in Lakes Fork and Palestine to meet future needs. Pipelines will need to be constructed to connect these two lakes to the Dallas system, The city of Dallas regularly reviews its Long Range Water Supply Plan to address issues such as future sources of water. This planning, along with wise water use, will ensure an adequate supply of water for future needs. DWU has an active Watershed Management Program that performed more than 8,000 tests on the water quality in the rivers, streams and reservoirs in 2001. In addition, the city of Dallas' storm water quality and industrial pretreatment programs help prevent pollution. As water travels over the surface of the land, it dissolves naturally occurring minerals and can be polluted by animals or human activity. The presence of any of these pollutants in the untreated water does not necessarily pose a health risk in your drinking water. The Texas Natural Resource Conservation Commission will be reviewing all of Texas' drinking water sources. The city of Dallas will continue to commit the resources needed to ensure proper treatment and delivery of high quality water to its customers. IRAYROBERTSLAKEI -,T-;;,..". , 􀁾􀀭􀁾􀀭􀁉􀀠1, 11---'-[LAKE RAY HUBBARD I i i _______ 􀁔􀁾__ _ 􀁊􀁏􀁈􀁎􀀡􀁋􀁬􀁾􀀠DALtAS • ..."..v..., 􀀬􀁾􀀠a,. \ .,., DALLAS WATER􀁾􀁾􀀺􀀡􀀡'-I , 􀁾􀀠RESERVOIRS , I , I ILAKETAWAKONI! i , , I ILAKE FORK HOP!(Ii'/$􀀭􀀭􀀭􀁾􀀠I\'ClO':WAl.L I I 1 ----,,------.." ,,"" l 17i I, ""t'j, __ J-=--',,-ILL.,.) "-, 'I"-, 􀁾􀀠I 􀀧􀀬􀀬􀁟􀁾__, ""'" L I, , l' LEGEND " " "-' t-􀀭􀁾􀁾---􀁾􀁟--􀁟􀀢􀀢􀀧􀁾􀁶􀀮􀁾􀁟􀀠O<:1lI