2006 Water Quality Report What you need to know about DO YOU KNOW WHERE
YOUR TAP WATER COMES
LEAD in the drinking water FROM .......................2
' - Infants and young children are elevated lead levels in your tap Tigard's primary wholesale water
typically more vulnerable to lead water you may wish to have your provider, the Portland Water Bu- LEARN MORE ABOUT THE e s t i n g perfArmedi1 1
in drinking water than the general water tested. In the meantime reau, has implemented a corro- ` QUALITY OF YOUR TAP
population. It is possible that lead run the tap for 30 seconds to 2 sion control treatment to reduce WATER........................3
` �e • levels in your home may be minutes before use in cooking corrosion in plumbing by increas-
�- higher than at other homes in the and/or drinking. This will flush ing the pH of the water. Compark annuar
community as a result of materi- out water that may have been in son of monitoring results with
als used in your home's plumb- extended contact with your and without pH adjustment WHAT YOU NEED TO KNOW
ing. If you are concerned about household plumbing. shows more than a 50 percent ABOUT LEAD IN DRINKING ,
reduction in lead at the tap with WATER .......................4
Copper Lead pH adjustment. report
90th Percentile 0.35 ppm 12 .0 ppb
To learn more about lead ex-
AL exceeded if more than AL exceeded if more than posure contact the LeadLine at
Action Level The City of Tigard's Water Division is responsible for providing a clean, safe, dependable supply of drinking
In 2005 elevated levels of lead (AL) 10%of homes tested have 10%of homes tested have 503-988-4000.
levels above 1.30 ppm levels above 15.0 ppb water to the nearly 56,000 residents located in Tigard Water Service Area. The service area includes the
were not detected in ver, it is cities of Durham, King City, two-thirds of Tigard and the unincorporated area of Bull Mountain.
source waters. However, it is The Leadline provides informa-
important to remember that ex- Sites Exceeding No samples exceeded the 8 of 115 samples(7%)ex- tion about free lead in water test-
Action Level Action Level ceeded the action level
posure to lead through drinking ing. The program targets testing
water is possible if materials in a water from households that are Providing Tigard with a
building's plumbing contain lead. Maximum most at risk from lead in water.
The level of lead in water can Contaminant 1.30 ppm 0.00 ppm Specifically those households
Level Goal clean safe water supply
increase when water stays in with pregnant women or children
contact with lead-based solder age six or younger who live in
Contaminant commercial plumbing systems 7
and brass faucets containing Sources Corrosion of household and homes built between 1970 and
lead. 1985. In 2005 over 2.2 billion gallons of and/or exceed all Federal and State
water was dis- drinking water lf•
tributed to the standards.
residents of the Committed to the provision of a
City of Tigard PRSRT-STD Tigard Water CLEAN, SAFE and DEPENDABLE The purpose of
v U.S.POSTAGE PAID Service Area. supply of drinking water this report is to
Water Division p i
13125 SW Hall Blvd. PORTLAND,OR D e m a n d s present a sum- ?
PERMIT NO.2528 ranged from an average of 6 mil- mary of Tigard's water quality data -
' Tigard, OR 97223 lion gallons a day during winter collected in 2005. Additional in-
\.
months to a peak high of 13.5 mil- formation is provided to inform,
lion gallons per day during the educate and update consumers on
summer. water issues affecting the commu-
nity such as water sources and
In addition to the 150 different con- health information for the immuno-
* * * * * * E C R W S S taminants tested for by our whole- compromised.
sale water providers, Tigard moni-
P O S T A L C U S T O M E R tors the water quality through water For more information, contact the �►�
samples collected within the water Tigard Water Division at 503-639-
distribution system. Tigard's 4171 or visit the City's web site at '!
drinking water continues to meet www.tigard-or.gov/water.
Be I n v o I v e d
Are you interested in learning more about Tigard's water issues? If so, the Intergovernmental Water
Board invites you to attend their monthly meetings. The Board consists of representatives from the mu-
nicipalities within the Tigard Water Service Area. Meetings are scheduled for the second Wednesday of
each month at 5:30 pm in the Tigard Water Building Auditorium located at 8777 SW Burnham Street in
Tigard,Oregon. For more information contact the City of Tigard's Water Division at 503-639-4171.
Drinking Water Sources Information on Detected Contaminants Important Health Information . . . Some may be more vulnerable to contaminants in the drinking water than the
general population. pst si wr ised persons such as cancer patients undergoing ippersons who ve
The City of Tigard does not have ownership in a Barium and Fluoride are ele- • • • .. .. uundergonneorgn transplant , pesos with HV/AIDS or other disorders, some elderly adnf infants, canbeparticularly at risk
water supply capable of meeting the current and ments that occur in the earth's (protozoan) present surface water from infections. These persons should seek advice about drinking water from their health care providers. The Environmental Protection
future demands of its residents. In order to meet crust. Metals (barium) and other supplies naturally throughout world. Surface water Agency and the Centers for Disease Control and Prevention provide guidelines on the appropriate means to lessen the risk of infection by
the growing demand for water, Tigard purchases minerals (fluoride) can dissolve _ Cryptosporidium and other microbial contaminants. For more information call the Safe DrinkingWater Hotline at 1-800-426-4791 or visit the
g g g p into the water that resides in '• '' vulnerable
nearly 90% of its water from wholesale water pro- groundwater aquifers. . . pollution
from human or animal EPA's web site at www.epa.gov/ow.
viders such as the Portland Water Bureau (PWB). wastes. Since wildlife inhabits
The PWB manages the Bull Run Watershed, a Disinfection By-Products are • IMPORTANT DEFINITIONS Trask-Tualatin . The Water You Drink
surface water supply, located in the Mount Hood formed as a result of chemical tersheds, regularly moni- Maximum Contaminant Level In addition to the 150 different contaminants tested for by our wholesale water provid-
reactions between chlorine and _ Goal (MCLG): The level of con
National Forest. In cases of emergency and/or naturally occurring organic matter • for • • • taminant in drinking water below ers, Tigard monitors water quality through water samples collected within the water
high demand, the PWB also maintains groundwa- in the water. These by-products morethan ten years. Occasionally, low _ of which there is no known or ex- - distribution system. Tigard's drinking water continues to meet and/or exceed all Fed-
ter wells located along the Columbia River. can have negative health effects. Cryptosporidium are found to •- present. N- petted risk to health. MCLGs
The disinfection process is care- national standardshave been est,. _• to allow for a margin of safety. eral and State drinking water standards. If you have any questions and/or concerns
In addition Tigard purchases water from the City of fully controlled to remain effective further reduceof illness from • • Maximum Contaminant Level regarding this report, contact Tigard's Water Quality Program Coordinator at 503-718-
Lake Oswego. while keeping by-product levels sporidium. • of ■_ nau- (MCL): The highest level of a 2604 or visit our web site at www.tigard-or.gov/water.
Lake Oswego low' abdominal cramps . diarrhea. •st contaminant that is allowed in
drinking water. MCLS are set as
draws its water Gross Alpha and Beta Emittershealthy
individuals '' ' overcome close to the MCLGs as feasible
supply from the are formed from the erosion of • - • - using the best available treat- Water Quality AnaIysis Results for 2005
Clackamas River natural and man-made deposits. compromised people have more difficulty • ment technology.
Basin. Encom- developing Maximum Residual Disinfec- Highest Amount
passing nearly Nitrate and Nitrites are nutrients _ •. Immuno-compromised tant Level (MRDL): The highest Contaminant MCL MCLG Typical Source
p 9 YDetected
that can support microbial growth _ encouraged d level of a disinfectant allowed in
940 square (bacterial & algae). Nitrate and �� •�; " appropriate drinking water. There is con INORGANICS
miles, the basin begins in the Mt. Hood National nitrite levels exceeding the stan- • avoid precautions to
vincing evidence that addition of
Forest. Drawn from the Clackamas River the water dards can contribute to health infection. Cryptosporidium •- ingested for it a disinfectant is necessary for Barium 25.0 ppb 2,000 ppb 2,000 ppb Erosion of natural deposits
problems. . - disease, - . -spread . • control of microbial contami in groundwater aquifers
is pumped through a pipeline buried deep beneath . . Hants. Water treatmentadditive;
the Willamette River to the Lake Oswego Treat- other drinking Fluoride 1.36 ppm 4.00 ppm 4.00 ppm erosion al deposits
Radon is an unregulated contami- Maximum Residual Disinfec-
ment Plant located in West Linn. nant and is a naturally occurring, radioactive gas that cannot be seen,tasted or smelled. tant Level Goal (MRDLG): The Nitrate 2.90 ppm 10.0 ppm 10.0 ppm
Radon was not been detected in Tigard's purchased water supplies but has been de- level of a drinking water disinfec- Erosion of natural depos-
During periods of high water demand Tigard can tected at varying levels in Tigard's aquifer storage and recovery (ASR)wells and native tant below which there is no Nitrite 20.0 ppb 1,000 ppb 1,000 ppb its;animal wastes
supplement its supply with water from city-owned groundwater wells. For more information about Radon, call the EPA's Radon Hotline at known or expected risk of
1-800-SOS-RADON or visit www.epa.gov/safewater/radon.html. health. MRDLGs do not reflect Sodium* 12.0 m No Standard No Standard Added in water treatment;
aquifer storage and recovery (ASR) wells and na- the benefits of the use of disin- pp erosion of natural deposits
tive groundwater wells. Additional supply is avail- fectants to control microbial
Sodium is an unregulated contaminant that has not been assigned a drinking water contamination. RADIOLOGICALS
able for purchase from the Joint Water Commis- standard by the Environmental Protection Agency. Sodium is an essential nutrient. At
Radon* 610 Ci/1 No Standard No Standard Erosion of natural deposits
Sion (JWC) a surface water supply that draws wa- the levels found in drinking water, it is unlikely to significantly contribute to adverse Action Level (AL): The concen- p in groundwater aquifers
ter from the Trask and Tualatin Rivers Watershed. health effects. tration of a contaminant, which,
if exceeded, triggers treatment, Gross Alpha 2.10 pCi/I 15.0 pCi/l 0.00 pCi/1
Water from the JWC is delivered via the City of or other requirements that a Erosionofateragdeposits
water S stem must follow. in groundwater aquifers
Beaverton's water distribution system making it Y Gross Beta Less than 1.50 pCi/1 50.0 pCi/1 0.00 pCi/1
Tigard's only fluoridated supply. An Important Message from the EPA . . . Sources
Treatment Technique (TT): A DISINFECTION BY-PRODUCTS
(both tap and bottled) include rivers, lakes, streams, ponds, reservoirs, springs and required process intended to
In 2005 the Oregon Departments of Human Re- wells. Water travels over the surface of the land and/or through the ground, dissolving reduce the level of a contami- Total Chlorine Average: 0.52 ppm Water additives used to
sources (DHS) and Environmental Quality (DEQ) naturally occurring minerals which, in some cases, includes radioactive materials and nant in drinking water. Residual (range:0.00-2.13) 4.00 ppm 4.00 ppm control microbes
other substances resulting from the presence of animals or human activity. Contami-
conducted asource water assessment on Tigard's Nephelometric Turbidity Units Total Average: 30.83 ppb
Hants that might be expected in untreated water include: microbial contaminants, such NTUs : Turbidity is a measure g 60.00 ppb 0.00 ppb
groundwater wells. Within the Tigard water service ( ) Y � Haloacetic Acids (range:3.70-ss.o)
as viruses and bacteria; inorganic contaminants such as salts and metals; pesticides of how clear the water looks. I By-product of drinking
area 50 sites were identified as potential sourceswater chlorination
and herbicides; organic chemicals from industrial or petroleum use; and radioactive con- Turbidity can interfere with disin- Total Average: 34.29 ppb
of drinking water contamination if managed im- taminants. g fection and provide a medium for Trihalomethanes (range: 11.2-77.5) 80.00 ppb 0.00 ppb
properly. Please remember that it is the responsi-
microbial growth.
bility of every individual, household, and business Because of water's natural cycle, drinking water, including bottled water, may reasonablyMICROBIOLOGICALS
Parts per million (ppm); parts
to protect the water supply. be expected to contain at least small amounts of some contaminants. However, the per billion (ppb): These units
presence of contaminants does not necessarily indicate that the water poses a health describe the levels of detected Turbidity 1.47 NTU 5.00 NTU Not Applicable Erosion ofnatural deposits
risk. To ensure that to water is safe to drink, the Environmental Protection Agency contaminants. One part per
To view a summary of the assessment and/or for p g Y million is equal to one minute in TT required:disin-
(EPA) 1 sample of 50 liters
more information regarding Tigard's efforts to ob- (EPA) prescribes regulations limiting the amount of certain contaminants in water pro- two years. One part per billion is Giardia had 5 cysts fectionUto inactivate Not applicable Animal wastes
tain ownership in water source, visit the Water Divi-
vided by public water systems. The EPA establishes test methods and monitoring re- equal to one minute in 2,000 99.9/0 of cysts
uirements for contaminants and requires public waters stems to give public notice in years. 2 of 61 samples in May o 0
q q P Y 9 p Coliform 5/o of 0/o of samples with Found throughout the
slon'S web site @ www.tigard-or.gov/water or had detetable coliform monthly samples detectable coliform bacteria environment
contact the Water Quality Program Coordinator at the event of a violation. More information about contaminants and potential health ef- Picocurries per Liter(pCi/l):A Bacteria (3%) y p
fects are available from the EPA's Safe Drinking Water Hotline at 1-800-426-4791; or standard measurement of beta These are UNREGULATED contaminants. Unregulated contaminant monitoringhelps the EPA determine
503-718-2604. visit their web site at www.epa.gov/ow. particles in water. ( ) g p
where certain contaminants occur and whether it needs to regulate those contaminants.