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2011 Water Quality Report TIGARD WATER SERVI TWSA AREA CE Providing a clean,safe,dependablepp Tigard,water to the residents of Durham,King City,two-thirds of . r. 9ummer • WATER SYSTEM INFORMATION v The Purpose oz this Report . . . qpI the City of Tigard is responsible for providing clean, safe and dependable Questions? J drinking water to nearly 57,000 residents located in the Tigard Water Tigard has the answers! Service Area (TWSA). The service area includes the cities of Durham, King Your Water Bill? City, two-thirds of Tigard and the Tigard Water District. Entities within this Utility Billing 503-718-2460 partnership are represented by the Intergovernmental Water Board (IWB). The Water Quality? IWB is advisor to the Tigard Cit Council on water-related matters. Jennifer Joe y g y jennifer@tigard-or.gov 503-718-2599 Water Conservation? This report is designed to present a summary of Tigard's 2010 water quality Jennifer Joe jennifer@tigard-or.gov data.Additional information is provided to inform, educate and update 503-718-2599 consumers on water issues affecting the community. Backflow Prevention? Hung Nguyen hung@tigard-or.gov For more information regarding this report,please contact Environmental Program 503-718-2603 Coordinator Jennifer Joe at 503-718-2599 orjennifer@tigard-or.gov. Water Emergencies? Public Works 503-718-2591 After-hours Water Emergencies? On-call Service 503-639-1554 ' General Inquiries? x Public Works ` 503-718-2591 �' 1 •�� Where does Tigard's water core rom? � W �F S 0 U R C E I N F 0 R M A T 1 0 N The City of Tigard does not have ownership in a AWP 01 _ water supply capable of meeting the current and T I G A R D W A T E R S E R V I C E A R E A future demands of its residents. In order to meet the growing demand for water,Tigard purchases Tigartl Water Service Boundary nearly 90 percent of its water from wholesale Tualatin Valley Water District Tualatin water providers such as the Portland Water Pea°1A Valley BEAVERTON Sipe\\sfe`ri Water Bureau (PWB). • ywy District service Area The PWB manages the Bull Run Watershed,a r� surface water supply located in the Mount Hood Tigard ,��r► National Forest.In cases of emergency and/or high demand,the PWB also maintains ground- ■..=#At* 001 Water water wells located along the Columbia River. Service ��a� �+► w .� " , Area Tigard also purchases water from the City of Lake Oswego.Lake Oswego draws its water from L~ rICARB ; the Clackamas River Basin.Encompassing nearly d■UNINCORPORATED ■ 940 square miles,the basin begins in the Mount a WASHINGTON = COUNTY Durham Road �■ Hood National Forest.Drawn from the Clackamas Beef Beo6Vad X110000■ ■ River,the water is pumped through a pipeline KING CITY .. buried beneath the Willamette River to the Lake ■ • _ ■..+ Oswego Treatment Plant located in West Linn. �� •''� �� o During periods of high water demand Tigard can '' i• `f supplement its supply with water from city-owned TUALATIN aquifer storage and recovery wells,and a native groundwater well. • 1 r' r r' I• I • I � r r' r' r' • � I 1 2 I Tigard Water Service Area 2011 Water Quality Report Information on Detected Contaminants Definitions Federal standards regulate contaminants NITRATES and NITRITES are formed Action Level (AL):The concentration of a to protect drinking water quality. through the erosion of natural deposits, contaminant,which, if exceeded,triggers These standards limit the levels of agricultural activity and leaching of treatment or other requirements that a watersystem must follow. contaminants that are known to occur septic tanks. Maximum Contaminant Level (MCL): in water and can adversely affect public The highest level of a contaminant that is health. The levels of contaminants GROSS BETA are particles emitted allowed in drinking water. MCLs are set as detected in Tigard's drinking water are from the decay of radioactive mineral close to the MCLGs as feasible using the best far below the maximum contaminant deposits,both natural and man-made. available treatment technology. levels (MCL) set by the U.S. EPA, and as Maximum Contaminant Level Goal such, do not pose a significant health (MCLG):The level of contaminant in drinking risk to consumers. UNREGULATED CONTAMINANTS water below which there is no known or expected risk to health. MCLGs allow for a Unregulated water quality standards are margin of safety. In addition to the over 200 regulated and established as guidelines to assist public Maximum Residual Disinfectant Level unregulated contaminants monitored water systems in managing drinking (MRDL):The highest level of a disinfectant by our wholesale water providers,Tigard water for aesthetic considerations allowed in drinking water.There is convincing monitored water quality through water such as taste,color and odor. These evidence that addition of a disinfectant is necessary for control of microbial samples collected within the TWSA water contaminants do not present a risk to contaminants. distribution system.Analysis results human health. Maximum Residual Disinfectant Level indicated Tigard's drinking water Goal (MRDLG):The level of a drinking water continues to meet and/or exceed RADON is a naturally occurring, disinfectant below which there is no known all federal and state drinking radioactive gas that cannot be seen, or expected risk of health. MRDLGs do not water standards.Below is a list of tasted or smelled. Radon has not been reflect the benefits of the use of disinfectants contaminants detected in Tigard's water detected in Tigard's purchased water to control microbial contamination. supply during 2010. supplies but has been detected at Method Detection Limit(MDL):The lowest concentration of a substance that can be varying levels in Tigard's aquifer storage accurately measured using applicable testing REGULATED CONTAMINANTS and recovery (ASR) wells and native methods. groundwater well. For more information Non-detected(ND):Not detected at or ALTIMONY,ARSENIC, BARIUM, about radon,call the EPA's Radon Hot above the MDL(Method Detection Limit). CHROMIUM, COPPER, FLUORIDE, Line at 1-800-SOS-RADON or visit www. Not Applicable (NA): Not applicable for the LEAD and VANADIUM are naturally epa.gov/safewater/radon/html. specified contaminant. occurring elements that can dissolve into Nephelometric Turbidity Units (NTUs): the groundwater supply. SODIUM is formed through the erosion Turbidity is a measure of how clear the water of natural deposits, added to water looks.Turbidity can interfere with disinfection CHLORINE is added to maintain during treatment, and is an essential and provide a medium for microbial growth. disinfection requirements throughout nutrient. Parts per Million (ppm) or Milligrams the water distribution system. per Liter(mg/L):A unit measurement SULFATE is formed through the erosion describing the level of detected contaminants g that is one part by weight of analyte to one DISINFECTION BY-PRODUCTS of natural deposits and at high levels million parts by weight of the water sample. (Bromate, Haloacetic Acids and can contribute to a salty taste and/or Parts per Billion (ppb) or Mircograms Total Trihalomethanes) are odor in water. per Liter(pg/L):A unit measurement formed through chemical reactions describing the level of detected contaminants between chlorine and naturally For a complete list of chemicals and that is one part by weight of analyte to one occurring organic matter in the water. compounds monitored on a regular billion parts by weight of the water sample. The disinfection process is carefully basis, contact Environmental Program Picocurries per Liter (pCi/1):A standard controlled to remain effective while Coordinator jennifer joe at 503-718- measurement of radioactivity in water. keeping by-product levels at a minimum. 2599 orjennifer@tigard-or.gov. Treatment Technique (TT):A required process intended to reduce the level of a contaminant in drinking water. 2011 Water Quality Report • Tigard Water service Area 1 3 Analysis • '1' • • 1• 1 '1 • 1 . • 1 1' 1 1 1 1 1 • 1 • 1. 1 1 • • 1 1 1' 1Water Quality over 200 regulated and unregulated contaminants. of testing during 2010 are '1 below. -'S CONTAMINANT MCL MCLG TWSA RESULTS VIOLATION TYPICAL SOURCE LOW E RANGE 4 HIGH YES/NO MICROBIOLOGICALS Fecal coliform and E.coli 0 0 3 samples had 4 bacterial colonies(100%of samples had NO Human and animal fecal waste 20 or fewer bacterial colonies per 100 milliliters of water) Giardia TT required:Disinfection to inactive 99.9%of cysts NA 8 samples of 10 liters had 1 Giardia cyst NO Animal waste Total coliform bacteria Must not detect coliform bacteria in more than 0%of samples with detectable coliform bacteria 100%of samples had non-detectable levels of NO Naturally present in the environment 5%of samples per month coliform bacteria Turbidity(NTU) 5 NA 0.23 2.00 NO Soil erosion I ' Antimony(ppb) 6 6 ND 0.12 NO Erosion of natural deposits,industrial manufacturing Arsenic(ppb) 10 0 ND 1.40 NO Erosion of natural deposits in groundwater aquifers Barium(ppm) 2 2 ND 0.10 NO Erosion of natural deposits in groundwater aquifers Chromium-Total(ppb) 100 100 ND 0.30 NO Erosion of natural deposits in groundwater aquifers Copper(ppm) NA' 1.3 ND 0.0036 NO Erosion of natural deposits in groundwater aquifers Fluoride(ppm) 4 4 ND 0.13 NO Water treatment additive,erosion of natural deposits Lead(ppb) NA 0 ND 0.15 NO Erosion of natural deposits Nitrate(ppm) 10 10 ND 1.60 NO Erosion of natural deposits,runoff from fertilizer, leaching from septic tanks and sewage Nitrite(ppm) 1 1 ND 0.10 NO Erosion of natural deposits,runoff from fertilizer, leaching from septic tanks and sewage I 1 I Gross Beta(pCi/I) NA 30 ND 3.40 NO Decay of natural deposits DISINFECTION II Bromate(ppb) 10 0 ND 0.005 NO By-product of drinking water disinfection Chlorine(ppm) 4 4 0.05 2.05 NO Water additive used to control microbes Haloacetic Acids(ppb) 60 NA ND 46.00 NO By-product of drinking water disinfection Total Trihalomethanes(ppb) 80 NA 1.80 46.80 NO By-product of drinking water disinfection (regulationsUNREGULATED AND SECONDARY ivide advisory limits only) Radon(pCi/1) No Standard No Standard ND 310 NO Found in natural aquifer deposits Sodium(ppm) 20 20 2.70 9.10 NO Erosion of natural deposits,water treatment additive Sulfate(ppm) 250 250 ND 7.26 NO Naturally occurring substance in drinking water Vanadium(ppb) No Standard No Standard 4.90 4.90 NO Found in natural deposits During the year,two different methods with different method reporting limits(MRLs)were used to analyze copper.The sample with results of<0.0036 was analyzed by the method with the less sensitive MRL. 2 There is no MCL for lead at the entry point to the distribution system.Lead levels are monitored at customers'taps.See"Lead in Drinking Water...Are You at Risk?"on page 6 for more information. 3 Community water systems monitor for gross beta at a screening level of 50 pCi/I.The screening level is not health based,but rather a level at which additional and increased monitoring would be required.Those systems detecting gross betas at or above the screening level are required to meet an MCL of four millirems per year. Lead and Copper Sampling at High Risk Residential Water Taps CONTAMINANT 90th Percentile MCL AL TYPICAL SOURCE Copper(ppm) 0.34 1.30 AL exceeded if 10%or more of homes tested have levels above 1.30 ppm Corrosion of household and commercial plumbing Lead(ppb) 12.0 15.0 AL exceeded if 10%or more of homes tested have levels above 15.0 ppb Corrosion of household and commercial plumbing AL:action level,MCL:maximum contaminant level,MCLG:maximum contaminant level goal,MRDL:maximum residual disinfectant level,MRDLG:maximum residual disinfectant level goal,MDL:method detection limit,ND:non-detected,NA:not applicable,NTUs:nephelometric turbidity units,ppm:parts per million,mg/L:milligrams per liter,ppb:parts per billion, pg/L:mircograms per liter,pCi/I:picocurries per liter,TT:treatment technique.For complete definitions,see page 3. Cryptosporidium Lead in the Drinking Water. . . .Are You at Risk? Elevated levels of lead can cause serious health problems,especially for pregnant women and young children.In the Tigard Water Service Area(TWSA),lead enters drinking water primarily through materials and components associated with a home's water service line and/or plumbing.For example,lead can leach into drinking water from the corrosion or wearing away of household plumbing components like brass and chrome-plated faucets,and lead-based solder used to join copper pipe. Lead levels in drinking water vary depending on the plumbing components used and the CRYPTOSPORIDIUM is a micro- amount of time water is in contact with those components.Lead is most often found in organism (protozoan) naturally drinking water that has been sitting in household plumbing for several hours,such as in the present in surface water supplies morning,or after returning from work or school.You can minimize the potential for lead throughout the world. Surface water exposure by flushing your tap for 30 seconds to two minutes before using water for drinking, supplies are particularly vulnerable if cooking,or preparing baby formula.You may also want to consider installing a water filter they receive runoff or pollution from and/or low-lead faucets. human or animal wastes. Although the City of Tigard is responsible for providing high quality drinking water to Since wildlife inhabits the Bull Run customers,it cannot control the variety of materials used in plumbing components beyond and Clackamas River Watersheds,the the water meter.It does,however,provide water which has undergone a treatment process to managing agencies regularly monitor increase the pH which helps to reduce the corrosion of plumbing components. for Cryptosporidium and have done so for more than ten years. Occasionally, To learn more about lead exposure call the LeadLine at low levels of Cryptosporidium have 503-988-4000 or visit www.leadline.org. For more been found. information on lead in drinking water, testing methods, and steps you can take to minimize exposure, call the Safe New national standards have been Drinking Water Hot Line at 1-800-426-4791 or visit established to further reduce the risks www.epa.gov/safewater/tead. of illness from Cryptosporidium. Symptoms of infection include nausea, abdominal cramps and diarrhea. Most healthy individuals are able to overcome the disease within L e a d L i n e a few weeks.However,immuno- compromised people have more 503-988-4000 difficulty and are at greater risk of developing severe,life-threatening ► FREE lead-in-water testing illnesses. Immuno-compromised ► FREE childhood blood lead individuals are encouraged to consult level testing their doctor regarding appropriate ► Lead poisoning prevention precautions to avoid infection. workshops ► Programs to reduce hazards in eligible homes Cryptosporidium must be ingested for it to cause disease and may be spread through www.leadline.org means other than drinking water. 6 I Tigard Water Service Area • 2011 Water Quality Report A in;�tl 5:a:os EPA An Important Message from the Environmental Protection Agency ' • '•" • '• ' • • '' • ' ' • ' = ' Sources of drinking water (both tap ' '• • • '• ' ' ' ' ' •' '• ' and bottled) include rivers,lakes, streams,ponds,reservoirs,springs '• =' • ' ' ' ' '• ' ' ' and wells.Water travels over the ' ' '• '• ' = ' ' surface of the land and/or through the ground,dissolving naturally • •• �' occurring minerals which,in some • cases,include radioactive materials and other substances resulting from • • ' • '" " ' ' the presence of animals or human activity. Contaminants that might be expected in untreated water include: microbial contaminants such as viruses and bacteria,inorganic contaminants such as salts and metals,pesticides and herbicides, organic chemicals from industrial or petroleum use,and radioactive contaminants. Because of water's natural cycle, drinking water,including bottled water,may contain small amounts of some contaminants.However, the presence of contaminants does not necessarily indicate that the water poses a health risk.To ensure that tap water is safe to drink,the Environmental Protection Agency 11 • 1 •; 1• �,., (EPA) prescribes regulations limiting WINE the amount of certain contaminants in water provided by public water systems.The EPA establishes test methods and monitoring requirements • for contaminants and requires public • water systems to give public notice in the event of a violation. More information about '• •' " • ' ' ' '' contaminants and their potential ' �'' ' "• health effects can be found by calling the EPA's Safe Drinking ' ' • ' ' ' ' �= ' ' ' Water Hot Line at 1-800-426-4791 or on the web at wwmepa.gov/ow. Frequently ' • Asked ' About I Quality Q) Is fluoride added to drinking increases hardness;Tigard's groundwater extensive testing,private laboratories can water? hardness is approximately 86 ppm (about five test your tap water for a fee. Not all labs grains per gallon), are accredited to test for all contaminants. A No. However,fluoride is a naturally For information about accredited labs, occurring trace element in groundwater. Q)What can I do about chlorine call the Oregon Department of Human Tigard also has one water supply,used taste and odor in my water? Services, Oregon Environmental Laboratory only during emergency conditions,that is Accreditation Program at 503-693-4122. fluoridated. 1 The simplest way to get rid of chlorine taste and odor is to place tap water in a Still have questions? Is the water soft or hard? container and allow it to sit for a few hours. Have you had brown tap water for more than With time,the chlorine dissipates and the V Our water is very soft.The hardness taste and odor will be gone. four hours?Want to learn more about water is typically four to 13 parts per million (ppm) quality and testing? or approximately one half grain of hardness How can I get my water tested? per gallon.During the summer months,when Contact the Environmental Program groundwater is blended with surface water, n For information about free lead-in- Coordinator tigard-or.g at 503-718-2599 the hardness level may be slightly higher. water testing call the LeadLine at 503-988- orjennifer@tigard-or.gov. This is because the addition of groundwater 4000 or visit www.leadline.org. For more City of Tigard I N S I D E PUBLIC WORKS DEPT. 13125 SW Hall Blvd. ► Purpose of this Report Tigard, OR 97223 ► Source Information ► Tigard Water Service Area Map ► Information on Detected Contaminants ► Definitions ► 2010 Water Quality Analysis Results ► Cryptosporidium ► Lead in the Drinking Water... Are You at Risk? ► Water and Your Health ► TWSA Source Water Assessment ► Important Message from the EPA Have a question about this report? ► Frequently Asked Questions Contact Environmental Program Coordinator Jennifer Joe at 503-718-2599 or jennifer@tigard-or.gov. zHabla Espanol? H2O Este informe contiene informaci6n importante acerca de su agua potable.Haga que alguien to traduzca para usted,o hable con alguien que to entienda. The Purpose of this Report... QUestlans? i wW n.mµ ° ., o- �mr ® This report was printed on recycled paper with environmentally friendly inks. u men M h i h. Please remember to recycle. , ,, mwm�,i mr�„m,,;, o,:orrg:msm�wmmm 8 1 Tigard Water Service Area • 2011 Water Quarity Report p