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2007 Water Quality Report Annual WaterQuality Report Proudly serving the 57,000 residents of the Tigard Water Service Area Our Commitment to Delivering a Clean, Safe, and Dependable Water Supply The availability and delivery of a clean, summer. Summer demands for water Staying Informed- The Tigard Water safe, and adequate supply of water is are typically two to three times higher Service Area (TWSA) includes the cities essential for the health, protection, and than other times of the year. Known as of Durham, King City, two-thirds of prosperity of a community. In the "summer peaking," this increase in de- Tigard, and the unincorporated area to United States, tap water plays a funda- mand is concerning. When the rate at the south and west of Tigard. The City mental role in public health, economic which water is being drawn from reser- of Tigard is the water provider for the development, fire protection, and qual- voirs accelerates, it threatens the TWSA and entities within this partner- ity of life. amount of water supply available for ship are represented by the Intergovern- emergencies and fire protection, thus mental Water Board(IWB). Report Purpose - The purpose of this increasing the challenge of providing report is to present a summary of Ti- consumers with an adequate supply of The IWB invites those interested in gard's water quality data collected in high quality drinking water. learning more about local drinking wa- 2006. Additional information is pro- ter issues to attend its monthly meet- vided to inform, educate, and update Quality of Water - In addition to sup- ings. Meetings are scheduled for the consumers on water issues affecting the ply,the City of Tigard is responsible for second Wednesday of each month at community. This includes such topics as ensuring the water being delivered is of 5:30 p.m. in the Tigard Water Building water supply resources and health infor- the highest quality. Water quality is Auditorium located at 8777 SW Burn- mation for the immuno-compromised. monitored at the source and at desig- ham Street in Tigard, Oregon. nated sites located throughout Tigard's Demand for Water - In 2006, the City water distribution system. Water sam- For more information regarding this re- of Tigard provided over 2.2 billion gal- ples are regularly collected and analyzed port please contact the City of Tigard's lons of water to residents in the Tigard for over 150 different contaminants. As Water Quality Program Coordinator at Water Service Area. With an average this report explains, Tigard's drinking 503-718-2604 or visit the City of Tigard's daily demand of 6 million gallons dur- water continues to meet and/or exceed web site at www.tigard-or.gov/water. ing winter months to a peak demand of all Federal and State drinking water 13.5 million gallons per day during the standards. rrlySOURCE -_ ... . supplySOURCE supplySOURCE .— _ rr Drinking Water Sources for the Tigard Water Service Area The Tigard Water Service Area (TWSA) receives nearly 90 percent the Clackamas River Basin. Encompassing nearly 940 square miles, of its water from wholesale water providers. Most of the water the basin begins in the Mt. Hood National Forest.Drawn from the purchased comes from "surface water" sources. Surface water Clackamas River the water is pumped through a pipeline buried sources are open to the beneath the Willamette PORTLAND atmosphere, such as rivers SERVICEAREAS SCtFPLy'r River to the Lake Oswego and lakes. In addition the .Name --ry pN M, N' Rd Treatment Plant located ti rgom wd+e°scorn ee�"ewy Tj TWSA receives water from TliT T""'°" in West Linn. MprdMie!• i"TVWD . ground water sources in cluding city-owned wells �` During periods of high and Portland Water Bu- ga ` water demand, Tigard can reau WB wells. The `� (PWB) ,,: `' r supplement its supply \+1 BEAVERTON Aiy SUPPLY TWSA drinking water 40 MAIN a it (•,Q` V � with water from city- water w� supply is a mixture of both ao6 rP +'T �� SUPPLY owned aquifer storage and MA€N surface and ground water. r ,� ?sQ f recovery wells and native G Xst `, r' 'Tvwff. groundwater wells. Addi- as ( ns�noa,ea S Tigard purchases the ma �I a "' `� '� THE i�Y tional supply is available ■UNINCORPORATEQ a Rd li moi: FV *ARD-jority of its water from the ,.,.WA ©F-T€C SHINGTON _ b for purchase from the PWB. The PWB manages ;COUNTY Joint Water Commission ¢ - the Bull Run Watershed, a r�x� ° �11AlDw,,,,,,tta LAKE GWC) which draws a sur- ■ OSWEGO surface water supply, to _ MSAUP LY face water supply from cated in the Mount Hood ; the Trask and Tualatin National Forest. In cases `�.� +��• 4 Rivers Watershed. Water of emergency and/or high i from the JWC is piped demand, the PWB also TIJALATIN through the City of Bea- maintains groundwater verton's water distribu- wells located along the tion system. Since Beaver- Columbia River. Tigard also purchases water from the City of ton adds fluoride to the water supply,water delivered to Tigard via Lake Oswego. Lake Oswego draws its surface water supply from this route contains fluoride. IWater For Tomorrollpor The Tigard Water Service Area's — City of Lake Oswego comes with its own set of challenges, op- (TWSA's) peak water demand can reach Expansion& Water Partnership portunities, and constraints. over • • • but • as our population continues to increase, To learn more about water supply op- that number is expected to reach 20 MGD City of Portland tions, the M invites interested TWSA by 0 0. Currently, the TWSA Water Purchase Agreement residents to attend its monthly receives its water from •urces, Source.BultRun Watershed or of • • site but these sources aren't capable of meet- v�ww.t1gard-or.gov. If you have a specific ing the growing demand for water. As a Tualatin Basin inquiry, please contact the City of Ti- result, the City of Tigard, along with In- Water Supply Project gard's Public Works Director Dennis tergovernmental Water Board (IWB) part- Source Tr2sk&Tualatin Rivers Koellermeier at 503-718-2596 or via email ners Durham, King City • Tigard dennis(&tlgard-or.gov. ter District, will •• be • with a se- Willamette River - J ries of decisions regarding • : Transmission ProjectTap Water Delivers... drinking water source. These importantQUALITY OF LIFE decisions will chart a coursefor Ammf 11 Measures of a successful society: water supply and of options have the a• Iq Low Mortality Rates E tomers fordecades to come. Long-term •eliver high-quality, safe, drinking water Economic Diversity water supply options currently being that exceedsand anticipated Productivity studied are: latory standards. Yet, each .. _ Public Safety 99 depend on access to SAFE WATER AMEMbIL- Lead in the Drinking Water. . . Are You at Risk? In 2006, elevated levels of lead were NOT de- In addition to corrosion con- tected in Tigard's water sources. However,it is trol, Tigard participates in an important to remember that exposure to lead education program for lead ex- , through drinking water is possible if materials posure. The program, LeadLine, in a building's plumbing contain targets its services to households lead. The level of lead in that are most at risk from water can increase when To learn more lead in water. Specifi- water stays in contact cally, those households with lead-based solder about lead exposure with pregnant women and brass faucets con- contact the LeadLine or children age six or taining lead. 03-988-4000. younger who live in J homes built between 1970 Infants and young children and 1985. If you are concerned a are typically more vulnerable to lead in drink- about elevated lead levels in your tap ing water than the general population. It is water,you may wish to have your water possible that lead levels in one home may be tested. To learn more about lead exposure higher than other homes in the community as and/or to request a FREE lead in water sam- a result of materials used in the home's plumb- ple, please contact the LeadLine at 503-988- ing. To reduce possible levels of lead in the 4000. home, run the tap for 30 seconds to 2 minutes before using water (Pb) for cooking and/or drinking. This will flush out water that may have exceeded if 10%or • AL exceeded if more0 been in extended contact with Action Level (AL) • • • • ` have levels your household plumbing. above0 "ppm above0 ppb The primary wholesale water proMaximum - vider for TWSA, the Portland Contaminant 1.30 ppm 0.00 ppb Water Water Bureau, has implemented a Level(MCL) corrosion control treatment to reduce corrosion in plumbing by 90th No samples exceeded 17 of 116 samples exceeded the increasing the pH of the water. Percentile the action level action level Comparison of monitoring results with and without pH adjustment shows more than a 50 percent re- Typical Corrosion of household duction in lead at the tap with pH Source and commercial plumbing systems adjustment. Important Information Ahout Cryptosporidium - Cryptosporidium is a microorganism (protozoan)naturally present in surface water supplies throughout the world. Surface water supplies are particularly vulnerable if they receive runoff or pollution from human or animal waste. Since wildlife inhabits the Bull Run, Clackamas River, and Trask-Tualatin River Watersheds,the managing agencies regularly monitor for cryptosporidium and have ' done so for more than ten years. Occasionally,low levels of cryptosporidium are found toTQ ' " � be present. New national standards have been established to further reduce the risks of FIR illness from cryptosporidium. Symptoms of infection include nausea, abdominal cramps, ' and diarrhea. Most healthy individuals are able to overcome the disease within a few r Deliver weeks. However, immuno-compromised people have more difficulty and are at greater risk of developing severe, life threatening illnesses. Immuno-compromised individuals are delivery ' water Jr figbtfire encouraged to consult their doctor regarding appropriate precautions to avoid infection. ' •' ' t y. Cryptosporidium must be ingested for it to cause disease and may be spread through means other than drinking water. '� "watersmartC O N S E R V AT I O N ,watersmartC O N S E R V AT I O N watersmart Tigard Water Users Save Water! In the last several years, residents of the Tigard Water Service Area have worked hard to conserve water. Gallons used per person per day has decreased 8.5 percent since 2000. Industrial water usage has decreased by 42 percent, commercial water usage has decreased by 8.8 percent, and multi-unit residential water usage has decreased 9.1 percent since 2002 . Reducing Your Use - Made Easy To help save water and money, the City of Tigard offers the following items FREE of charge to our water customers: Indoor Water Conservation Kits contain: Outdoor Water Conservation Kits contain: v Shower Coach® shower timer v Low-flow hose nozzle ,i v The Earth® massage showerhead v Rain gauge v Teflon tape v Water wise wildflower seeds v Bathroom water faucet aerator v Informational brochures: v Kitchen water faucet aerator ... How to Select a Landscape Contractor v Leak detection dye tablets ... The Irrigation Bill of Rights Water-Efficient Plant Guide: ... Planting&Maintaining Your Lawn A great 45-page color and picture guide to water wise and native plants appropriate for the Willamette Valley. ... 7 Basic Steps for Creating Water Efficient Landscapes Preparing A New Generation of Water Consumers Educational offerings are an integral part of Tigard's water conservation program, and the City continues to build and foster partnerships with local schools. Educational offerings include free presentations, activities, and videos to help students un- derstand water conservation issues. Many teachers have taken advantage of these programs;in the 2006-2007 school year, 40 presentations were given to over 1,600 students. -------------------------------------------------------- I I Take the 10-Gallon Challenge Today! I I How many gallons would be saved if every City of Tigard resident were to save just 10 gallons of water per day? 1 day: 440,000 gallons 1 week: 3,080,000 gallons 1 year: 160 million gallons ! I I I I I I Turn off the faucet when you brush your teeth 5 gallons I � I Decrease your shower time by four minutes 10 gallons I I I I Keep a pitcher of water in the refrigerator rather than running the tap until cold 16 gallons Change out your toilet to a low flow model 12 gallons- I I I I Install weather based controller on your automatic irrigation system (or reduce lawn watering to one inch per week) Up to 300 gallons I I L-------------------------------------------------------� Award-Winning Water Conservation Calendar For the past several years, Tigard's conservation program In 2006, Tigard's water conservation calendar also featured has included the creation of a water conservation calendar. the artwork of students from Tigard's sister city, Balikpa- Each year, Tigard pan, Indonesia. This calendar, along with several previous yae Water Service calendars, received an Excellence in Communication and l7 � Area elementary Conservation Award from the Pacific Northwest Section O ° ° o students partici- of the American Water Works Association. }y + ; pate in a poster r t context, and the winning posters A, E . W are incorporated into the calendar. � '�' at IonI at IonI / Tap Water Delivers... PUBLIC HEALTH Information on detected contaminants In a world where 9,000 people die everyday Turbidity levels in unfiltered water (such as the Bull Run supply) must not exceed 5 NTU from preventable wa- (Nephelometric Turbidity Units). The typical cause of turbidity are tiny particles of sedi- ter-borne disease, our ment entering the water supply during storm events. Turbidity can interfere with disinfec- �'_ water systems assure we tion and provide a medium for microbial growth. can drink from virtu- ally any public tap with Giardia lamblia is an organism that originates in wildlife inhabiting the watershed. This a high degree of safety. organism causes giardiasis and is inactivated through the use of chlorine disinfection. Arsenic, Barium, and Fluoride are elements that occur in the earth's crust. Metals An Important Message (barium) and other minerals (fluoride) can dissolve into the water that resides in groundwa- ter aquifers. from the U.S. EPA Sources of water (both tap and bot- Nitrate and Nitrites are nutrients that can support microbial growth. Nitrate and nitrite tled) include rivers, lakes, streams, levels exceeding the standards can contribute to health problems,especially in infants. ponds, reservoirs, springs and wells. Sodium is an unregulated contaminant that has not been assigned a drinking water stan- Water travels over the surface of the dard by the Environmental Protection Agency. Sodium is an essential nutrient. At the lev- land and/or through the ground, dis- els found in drinking water, it is unlikely to significantly contribute to adverse health ef- solving naturally occurring minerals which, in some cases, includes radioac- tive materials and other substances Di(2-ethylhexyl�pbtbalate commonly known as phthalate, is a common chemical used in resulting from the presence of animals the process of manufacturing plastics. While there are no known sources of phthalate in or human activity. Contaminants that any of the water supplied to the TWSA, its widespread use and presence in the environ- might be expected in untreated water ment has resulted in its detection. The source of the detection can not be determined, but include: microbial contaminants, such could have resulted from cross-contamination in the laboratory during analysis. Phthalate as viruses and bacteria; inorganic con- taminants such t salts and metals; exposure at high levels over a continued period of time may cause cancer. It is unlikely to pose a health risk at the level found. pesticides and herbicides; organic chemicals from industrial or petro- Radon is an unregulated contaminant and is a naturally occurring, radioactive gas that can- leum use; and radioactive contami- not be seen, tasted, or smelled. Radon was not been detected in Tigard's purchased water nants. supplies but has been detected at varying levels in Tigard's aquifer storage and recovery Because of water's natural cycle, drink- (ASR) wells and native groundwater wells. For more information about Radon, call the ing water,including bottled water,may EPA's Radon Hotline at 1-800-SOS-RADON or visit www.epa.gov/safewater/radon.html. reasonably be expected to contain at Gross Alpha and Beta Emitters are formed from the erosion of natural and man-made least small amounts of some contami- radioactive deposits. nants. However, the presence of con- taminants does not necessarily indicate Disinfection By-Products are formed as a result of chemical reactions between chlorine that the water poses a health risk. To and naturally occurring organic matter in the water. These by-products can have negative ensure that tap water is safe to drink, health effects. The disinfection process is carefully controlled to remain effective while the Environmental Protection Agency keeping by-product levels low. (EPA) prescribes regulations limiting the amount of certain contaminants in water provided by public water sys tems. The EPA establishes test meth- Source Water Assessment for Tigard Water Service Area ods and monitoring requirements for contaminants and requires public wa- In2005, the Oregon Departmentsof • and Environmental ter systems to give public notice in the • •) conducted a sourcefor • •' event of a violation. More information ing the TWSA. The purposeof • identify potential sourcesof about contaminants and potentialgroundwater health effects are available from the assessment identified 50 potential contaminant sources (natural and man-made) that EPA's Safe Drinking Water Hotline at . _• improperly. 1-800-426-4791; or visit the web site at . . • .• Coordinator 503-718- wzvze�.epa.gov/ow - The Water You Drink...In addition to the 150 different contaminants tested by our wholesale water providers,Tigard monitors water quality through water samples collected within the water distribution system. Analysis results indicate Tigard's drinking water continues to meet and/or exceed all Federal and State drinking water standards. Only those contaminants detected in the drinking water supply are outlined in the table below. For a complete list of chemicals and compounds tested for on a regular basis,visit the City of Tigard's web site at www.tigard-or.gov/water. 2006 Water Quality Analysis Results Contaminant Total Coliform 5%of monthly samples 0%of samples with 1 of 61 samples in December Found throughout Bacteria detectable coliform bacteria had detectable coliform(<2%) the environment 0 C C, Turbidity 5.00 NTU Not Applicable 4.35 NTU Erosion of natural deposits O TT req uired:disinfection Giardia o Not Applicable 2 samples of 50 liters had 2 cysts Animal wastes to inactivate 99.9%of cysts Arsenic 10.0 ppb 10.0 ppb 3.00 ppb Barium 2.00 ppm ■ 2.00 ppm 0.02 ppm Erosion of natural deposits in groundwater aquifers Chromium 100 ppb 100 ppb 29.0 ppb Fluoride 4.00 ppm 4.00 ppm 1.26 ppm Water treatment additive; 10 erosion of natural deposits s� nNitrate 10.0 ppm 10.0 ppm 0.90 ppm Erosion of natural deposits; Nitrite 1,000.00 ppb 1,000.00 ppb 70 ppb animal wastes Sodium* No Standard No Standard 19.0 ppm Added in water treatment; erosion of natural deposits Common chemical used to ap Di(2-ethylhexyl) soften plastics;discharge phthalate 6.00 ppb 0.00 ppb 0.99 ppb from rubber and chemical factories Radon" No Standard No Standard 630 pCi/l G. O Erosion of natural deposits p Gross Alpha • 15.0 pCi/l 0.00 pCi/l 3.00 pCi/1 in groundwater aquifers UQ n' Gross Beta 50.0 pCiA 0.00 pCi/l 3.00 pCi/l Contaminant MCL MCLG Levels Detected Typical Source Total Average:1.13 ppm Water additives used to �W d Chlorine Residual 4.00 ppm 4.00 ppm (range.0.00-2.11) control microbes Total Average:26.86 ppb o rt 60.00 ppb 0.00 ppb Haloascetic Acids range.7.40-53.3) By-product of drinking o water chlorination Total Average:30.37 ppb Trihalomethanes 80.00 ppb 0.00 ppb range.1.20-63.6) helpsUnregulated Contaminants-Unregulated contaminant monitoring . occurrence and whether it needs to regulate thosecontaminants. Parts per million(ppm);parts per billion(ppb):These units describe the levels Action Level(AL):The concentration of a contaminant,which,if ex- � of detected contaminants.One part per million is equal to one minute in two ceeded,triggers treatment,or other requirements that a water system must y years.One part per billion is equal to one minute in 2,000 years. follow. Maximum Contaminant Level(MCL):The highest level of a contaminant that Maximum Contaminant Level Goal(MCLG):The level of contaminant is allowed in drinking water.MCLS are set as close to the MCLGs as feasible using in drinking water below which there is no known or expected risk to P the best available treatment technology. health.MCLGs allow for a margin of safety. ,0 1 Maximum Residual Disinfectant Level Goal(MRDLG):Level of a Maximum Residual Disinfectant Level(MADE):The highest level of a disinfec- tant allowed in drinking water.There is convincing evidence that addition of a drinking water disinfectant below which there is no known or expected disinfectant is necessary for control of microbial contaminants. risk of health;does not reflect benefits of the use of disinfectants to control d microbial contamination. Picocuries per Liter(pCi/1):A standard measurement of radioactive Parti- ' Nephelometric Turbidity Units(NTUs):Turbidity is a measure of how clear cles in water. o the water looks.Turbidity can interfere with disinfection and provide a medium yfor microbial growth. Treatment Technique(TT):A required process intended to reduce the level of a contaminant in drinking water. Frequently Asked Questions Is the water hard or soft? The water is soft,with a typical range of Important Health Information 1/3 - 1/2 grains of hardness per gallon. Some people may be more vulnerable to contaminants in What can be done about chlorine odors? The odor is chlorine drinking water than the general population. Immuno- doing its job of disinfecting the water. The simplest way to get rid compromised persons such as persons with cancer undergoing of chlorine odor is to place tap water in a container and allow it to chemotherapy, persons who have undergone organ trans- sit over. The chlorine will dissipate and the odor will be gone. plants,people with HIV/AIDS or other immune system disor- ders, some elderly, and infants can be particularly at risk from Why is the water sometimes discolored? Discolored water is a infections. These people should seek advice about drinking common occurrence with surface water systems such as Bull Run. water from their health care providers. EPA/CDC guidelines Since the water is non-filtered, it is typical to have discolored water on appropriate means to lessen the risk of infection by crypto- in summer when drawing from lower water levels in the reservoirs sporidium and other microbial contaminants are available and during the fall when leaves dropping in the water may cause a from the Safe Drinking Water Hotline(1-800-426-4791). change in color. And the MOST frequently asked question - Is there fluoride in the water? The answer is yes and no. Tigard is able to meet customer demands with non-fluoridated water purchased from its permanent wholesale providers during the late fall, winter and spring months. However, as temperatures rise, so does the demand for water. To meet the increase in demand, Tigard utilizes its seasonal sources. This includes a number of city-owned wells and water purchased from the Joint Water Commission (JWC). Water purchased from the JWC is delivered using the City of Beaverton's water distribution system. Beaverton fluoridates its water supply, and as such, delivers a fluoridated supply of JWC water to the Tigard Water Service Area (TWSA). The purchase of JWC water is most common during the months of June, July, August and September. The amount of fluoridated water entering the system is quite small, and as a result, only affects a small por- tion of TWSA residents.Monitoring data shows those residents located nearest to the water's entry point (i.e. near Scholls Ferry Road and Barrows Road) will receive a fluoridated supply of water during the summer months. Unfortunately, exact start and ending dates, as well as the amount of water purchased,varies. To learn whether your home may be receiving fluoridated water during the summer months, please contact the City of Tigard's Water Quality Program Coordinator at 503-718-2604. City of Tigard PRSRT-STD �t Water Division U.S. POSTAGE PAID 13125 SW Hall Blvd. PORTLAND, OR PERMIT NO. 2528 Tigard, OR 97223 E C R W S S PO STAL CUSTOMER