2016 Water Quality Report CITY 1
Tigard
The City of Tigard provides clean,safe,dependable SUMMER
drinking water o the residentsof Durham, g ,
two-thirds of Tigard, Tigard Water District. KN4
• • Annual Water QualityReport
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Inside:
► The Purpose of this Report.............2
► Tigard Water Source Information.....2 r.'
► Tigard Water Service Area Map.......2
► Information on Detected
Contaminants.................................3
► Cryptosporidium ............................3
► Water Quality Analysis Results....4-5
►
Lead...Are You at Risk?..................6
► Definitions......................................6
► TWSA Source Water Assessment....6
► Drinking Water Contaminants..........7
► Immuno-Compromised Notice........7 _ r _ _ _ j - -_
► Conservation Tips............................7 ¢3i R _ • .` : -
/ Frequently Asked Questions.............8 - - -- _ _'' — _•��►_ =
► Are You Interested in Learning
More about Your Water?.................8
► Backflow Testing Reminder............8
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COVER PHOTO:
Clackamas River,Lake Oswego-Tigard p
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Water Partnership's high quality source r r'
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Where
• • 1 / • Ti,/rd's Water
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r S 0 U R C E I N F 0 R M A T 1 0 N
In 2016,Tigard's drinking water system delivered water from two high-quality sources—
�G' the Lake Oswego-Tigard Water Treatment Plant and the Portland Water Bureau as a
wholesale customer.In addition,Tigard uses groundwater supplies when needed.
4 .P�
Lake Oswego-Tigard Water Treatment Plant
The Lake Oswego Tigard Water Treatment Plant withdraws water from the Clackamas River
WATER SYSTEM INFORMATION Basin which encompasses nearly 940 square miles.Drawn from the Clackamas River,the
pumped water moves through a pipeline buried beneath the Willamette River to the Lake
The Purpose Oswego-Tigard Water Treatment Plant located in West Linn,
of this Report Portland Water Bureau (PWB)
The PWB manages the Bull Run Watershed,a surface water supply located in the Mt.Hood
The City of Tigard is responsible for National Forest.This watershed is 102 square miles and typically receives 80-170 inches of
providing a clean,safe,dependable rainfall per year.PWB switches to its groundwater source—the Columbia South Shore Well
supply of drinking water to over Field in cases of emergency,high demand or compromised water quality. All water received
60,000 residents in the Tigard Water from PWB is unfiltered.
Service Area(TWSA).This service
area includes the cities of Durham, Groundwater
King City,two-thirds of Tigard and
the Tigard Water District.Each During periods of high water demand,Tigard supplements its supply with water from
entity has representation on the city-owned aquifer storage and recovery wells and a native groundwater well.
Intergovernmental Water Board.The
board advises the Tigard City Council
on water-related matters. TIGARD WATER SERVICE AREA
....■
i ■ ■ Tigard Water Service Boundary
This report summarizes Tigard's ..... �
2016 Water quality data. Tualatin Valley water District Y a I Ile t i n
Y
Additional information is included Beaverton
District �
to inform,educate and update d S e r v i c e
consumers on water issues affecting S���OsFe r IN a
the community.See page 8 for /
more details.
Tigard �
Have a question about Water �/
this report? Service I
► Contact Environmental Program Are-a I
Coordinator Jennifer Joe at 503-718- `. .
pre me
2599 or jennifer@tigard-or.gov. a The Tigar
Wa a Disfrie �
► Habla Espanol?Este informe + `3
contiene informaci6n importante ■ =
King City=
acerca de su agua potable.Haga
que alguien to traduzca para usted ' pJ
o hable con alguien que to entienda. Tualatin ,,
2 1 2016 Water Quality Report • City of Tigard Water Division
Information on Detected
Water Contaminants K
n 2016,Tigard's water providers Total Coliform Bacteria are naturally
monitored over 200 regulated and present in the environment and may
unregulated contaminants,which indicate other potentially harmful bacteria -
include pesticides and radioactive are possibly present.Chlorine is added to the
contaminants. In addition,Tigard drinking water supply to kill these bacteria. Cryptosporidium
staff concurrently tested water quality
throughout the TWSA distribution Turbidity is a measure of the amount
system.If a known health-related of sediment suspended in the water.This Cryptosporidium is a micro-organism
contaminant is not listed in this sediment can interfere with disinfection (protozoan)naturally present in
report,it was not detected in the and provide a medium for microbial surface water supplies throughout
drinking water. growth.Large storm events can result in the world. Surface water supplies are
increased turbidity. particularly vulnerable if they receive
Federal standards regulate contaminants runoff or pollution from human or
to protect drinking water quality.These UNREGULATED CONTAMINANTS animal wastes.
standards limit the levels of contaminants
known to occur in water that can adversely Water quality standards for unregulated
contaminants establish guidelines to assist Since wildlife inhabits the Bull Run
affect public health. and Clackamas River watersheds,
public water systems in managing drinking
water for aesthetic considerations such as managing agencies regularly monitor
REGULATED CONTAMINANTS taste,color and odor.These contaminants for Cryptosporidium. Occasionally,
Arsenic,Barium,Fluoride and do not present a risk to human health. this monitoring detects low levels of
Vanadium are naturally occurring Cryptosporidium.
elements that can dissolve into the Radon is a naturally occurring,
groundwater supply.At the levels found in radioactive gas that cannot be seen,tasted New national standards further
the drinking water,they are unlikely to or smelled. Radon has been detected at reduce the risks of illness from
contribute to adverse health effects. varying levels in water from Tigard's aquifer Cryptosporidium.Symptoms of
storage and recovery wells and native infection include nausea,abdominal
Chlorine is added to maintain disinfection groundwater well.For more information cramps and diarrhea.
requirements throughout the water about radon,call the EPA's Radon Hotline
distribution system. at 800-SOS-RADON or visit www.epa.gov/ Most healthy individuals are able
radon/rnwater.html.
Disinfection Byproducts— to overcome the disease within
Haloacetic Acids (HAA) and Total Sodium is formed through the erosion of a few weeks. However, immuno-
Trihalomethanes (THM)form through natural deposits and may be added to water compromised people have more
chemical reactions between chlorine during treatment. difficulty and are at greater risk of
and naturally occurring organic matter developing severe, life threatening
in the water.The careful control of the illnesses. Immuno-compromised
disinfection process keeps byproduct levels To learn about the health effects individuals are encouraged to consult
to a minimum,while maintaining the of contaminants, visit the Oregon their doctor regarding appropriate
required levels of chlorine. Health Authority website at precautions to avoid infection.
http//public.health.oregon.
Nitrates and Nitrites form through the gov/HealthyEnvironments/ Cryptosporidium must be ingested
erosion of natural deposits,agricultural DrinkingWaterlMonitoring/ for it to cause disease and may be
activity and leaching of septic tanks. HealthEffects/Pages/index.aspx spread through means other than
drinking water.
2016 Water Quality Report • City of Tigard Water Division 1 3
2016 Water I Analysis
Federal1. 1s regulate contaminantsorder 1 protect drinking water quality.
Tigard's wholesale . providers test f1 1re than 200 regulated and unregulated contaminants.
t
MCL MCLG TWSA Results Violation? Major Sources of
LOW F Range 4 HIGH YES/ NO Drinking Water
Fecal Coliform and A routine sample 0 0%of samples with No Human and animal
E.coli Bacteria and a repeat detectable E.Coli or fecal waste
sample are total fecal coliform bacteria
coliform positive,
and one is also
E. coli positive
Total Coliform Must not detect 0 0%of samples with No Naturally present in
Bacteria coliform bacteria detectable total coliform the environment
in more than 5% bacteria
of samples per
month
Turbidity(NTU) Cannot exceed NA 0.20 0.94 No Erosion of natural
5 NTU more deposits
than 2 times
in 12 months
z
Arsenic(ppb) 10 0 <0.50 0.84 No
Barium(ppm) 2 2 0.00077 0.00938 No
Copper(ppm) NA 1.3 <0.00050 0.00205 No Found in natural
deposits
Fluoride(ppm) 4 4 <0.025 0.18 No
Nitrite-Nitrogren(ppm) 10 10 <0.010 0.19 No Found in natural aquifer
deposits;animal waste
Lead(ppb) NA 0 <0.050 0.12 No Found in natural deposits
DISINFECTION RESIDUAL IMENEENEr— A
Total Chlorine 4 4 0.82 1.39 No
Residual Running
Annual Average(ppm) Additive used to
Total Chlorine NA NA 0.11 2.09 No disinfect water
Residual at Any
One Site(ppm)
4 1 2016 Water Quality Report • City of Tigard Water Division
-2 16 vty
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P�T.WW*00111i' Sir
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Contaminant MCL. MCLG TWSA Results Violation? Typical Source
LOW F Range 4 HIGH YES/NO
i i 1I 11 Iq&= R17,18i
Haloacetic Acids 0.060 s/ 0.0137 0.0168 No
Running Annual
Average(ppm) Byproduct of drinking
Haloacetic Acids at NA 0.0042 0.0288 No water disinfection
Any One Site(ppm)
i
Total Trihalomethanes 0.080 NA 0.0191 0.0229 No
Running Annual
Average(ppm) Byproduct of drinking
Total Trihalomethanes NA NA 0.0093 0.0385 No water disinfection
at Any One Site(ppm)
UNREGULATED AND SECONDARY
Radon(pCi/1) No Standard No Standard 260 360 No
Sodium(ppm) No Standard No Standard 3.4 16.3 No Found in natural
deposits
Vanadium(ppm) No Standard No Standard <0.00050 0.00390 No
Contaminant 90th Number of Sites Exceeding MCLG Lead and Copper Action Typical Source
Percen- the Actioni Level Rule Exceedance Level
tile Reached
Copper(ppm) 0.00 0%of samples(0 out of 1.3 More than 10%of the No
66)exceeded the copper homes tested have levels Corrosion of household
action level of 1.3 ppm above 1.3 ppm and commercial
Lead(ppb) 3.7 3%of samples(2 out of 0.0 More than 10%of the No plumbing
66)exceeded the lead homes tested have levels
action level of 15 ppb above 15 ppb
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 6.
2016 Water Quality Report - City of Tigard Water Division 1 5
Lead in the Definitions
Drinking Water. . .
Are You at Risk? Action Level (AL):The concentration of Not Applicable(NA):Not applicable for
a contaminant,which,if exceeded,triggers the specified contaminant.
treatment or other requirements that a water
system must follow. Nephelometric Turbidity Units
(NTUs):Turbidity is a measure of how
Maximum Contaminant Level (MCL): clear the water looks.Turbidity can interfere
The highest level of a contaminant that is with disinfection and provide a medium for
allowed in drinking water.MCLs are set as microbial growth.
close to the MCLGs as feasible using the best
/F Parts per Million(ppm)or Milligrams
available treatment technology.
bper Liter(mg/L):A unit measurement
Maximum Contaminant Level Goal describing the level of detected contaminants
t (MCLG):The level of contaminant in that is one part by weight of analyte to
drinking water below which there is no one million parts by weight of the water
known or expected risk to health.MCLGs sample. One part per million corresponds to
allow for a margin of safety. one penny in$10,000 or approximately one
If present, elevated levels of leadMaximum Residual Disinfectant minute in two years.One part per million is can cause serious health problems, Level (MRDL):The highest level of a equal to 1,000 parts per billion.
especially for pregnant women and disinfectant allowed in drinking water. Parts per Billion(ppb)or Micrograms
young children. Lead in drinking There is convincing evidence that addition per Liter(Ng/L):A unit measurement
water is primarily from materials and of a disinfectant is necessary for control of describing the level of detected contaminants
components associated with service microbial contaminants. that is one part by weight of analyte to one
lines and home plumbing. billion parts by weight of the water sample.
Maximum Residual Disinfectant One part.per billion corresponds to one
The City of Tigard is responsible Level Goal(MRDLG):The level of a penny in$10,000,000 or approximately one
drinking water disinfectant below which minute in 2 000 years.
for providing high-quality drinking there is no known or expected risk of
water, but cannot control the variety health.MRDLGs do not reflect the benefits Picocurries per Liter(pCi/L):
of materials used in plumbing of the use of disinfectants to control A standard measurement of radioactivity
components.When your water has microbial contamination. in water.
been sitting for several hours,you
can minimize the potential for lead Non-detected(ND):Not detected at or Treatment Technique(TT):A required
exposure by flushing your tap for above the MDL. process intended to reduce the level of a
30 seconds to 2 minutes before contaminant in drinking water.
using water for drinking or cooking.
If you are concerned about lead in TWSA SOURCE WATER ASSESSMENT
your water,you may wish to have The Oregon Health Authority and the Department of Environmental Quality conducted a
your water tested. Information on source water assessment for the aquifer storage and recovery wells and the native groundwater
lead in drinking water,testing well serving the Tigard Water Service Area(TWSA). The purpose of the assessment was to
methods and steps you can take identify potential sources of direct and indirect contamination in areas surrounding these
to minimize exposure is available wells.The assessment identified 50 potential contaminant sources(natural and manmade)
from the Safe Drinking Water Hotline that may affect the water quality if managed improperly.
(800-426-4791)or www.epa.gov/
safewater/lead. To view a summary of the assessment, contact Environmental Program Coordinator
Jennifer,joe at 503-718-2599 orjennifer@tigard-or.gov.
6 1 2016 Water Quality Report • City of Tigard Water Division
What the EPA Says about
Drinking Water Contaminants
In order to ensure that tap water is safe to drink,the US ��ED S%,
/
Environmental Protection Agency(EPA) sets regulatory limits on
the amounts of certain contaminants in water provided by publicLU
water systems.The Food and Drug Administration sets limits oCD Jr
on contaminants in bottled water,which must provide the same
protection for public health. FST ��`�
, PRO��
The sources of drinking water(both tap water and bottled water)
include rivers,lakes,streams,ponds,reservoirs,springs,and wells.As water travels over the Conservation Tips
surface of the land or through the ground,it dissolves naturally occurring minerals and,in
some cases,radioactive material,and can pick up substances resulting from the presence of Minor water leaks account for more
animals or from human activity. than 1 trillion gallons of water wasted
each year in U.S. homes.To make
Contaminants that may be present in source water include: sure leaks do not put a drain on your
► Microbial contaminants,such as viruses and bacteria,which may come from wildlife wallet, here are some things you can
or septic systems. do around the house:
► Inorganic contaminants,such as salts and metals,which can occur naturally or result
from urban stormwater runoff,industrial or domestic wastewater discharges or farming. ► Check wear on faucet washers
► Pesticides and herbicides,which may come from a variety of sources such as farming, and gaskets—if necessary
urban stormwater runoff and home or business use. replace worn parts.
► Organic chemical contaminants,including synthetic and volatile organic chemicals, ► Leaky toilets are most often the
which are byproducts of industrial processes,and may come from gas stations,urban
stormwater runoff and septic systems. result of a worn toilet flapper.
Replacing the rubber flapper is a
► Radioactive contaminants,which can occur naturally. quick fix that could save a home
Because of this natural part of water's cycle,drinking water,including bottled water,may with a constantly running toilet up
contain small amounts of some contaminants.However,the presence of contaminants does to 200 gallons of water per day.
not necessarily indicate that the water poses a health risk.
► Landscape irrigation systems
Drinking water,including bottled water,may reasonably be expected to contain at least small should be checked each spring
amounts of some contaminants. before use to make sure they were
not damaged by frost or freezing.
More information about contaminants andpotential health effects can be obtained
by calling the Environmental Protection Agency's(EPA)Safe Drinking Water Hotline If it is necessary to replace plumbing
(800-426-4791). fixtures, residents are reminded
to look for the WaterSense label.
SPECIAL NOTICE FOR IMMUNO—COMPROMISED PERSONS WaterSense labeled toilets,faucets,
and showerheads have been
Some people may be more vulnerable to contaminants in drinking water than the general independently tested and certified to
population. Immuno-compromised persons such as persons with cancer undergoing save water and perform as well as or
chemotherapy,persons who have undergone organ transplants,people with HIV/AIDS or better than standard models.
other immune system disorders,some elderly,and infants can be particularly at-risk from
infections.These people should seek advice about drinking water from their health-care Visit www.epa.gov/watersense for
providers.Environmental Protection Agency and Centers for Disease Control and Prevention more information about WaterSense
guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other labeled products.
microbial contaminants are available from the Safe Drinking Water Hotline (800-426-4791).
2016 Water Quality Report • City of Tigard Water Division 1 7
FREQUENTLY 1 QUESTIONS
QuL,,.hons.o
&A
TIGARD HAS THE ANSWERS! Q about H 0
Your Water Bill?
Utility Billing ....... 503-718-2460 2
Water Quality? Is fluoride added to our What can I do about chlorine taste and
Jennifer Joe....... 503-718-2599 drinking water? odor in my water?
jennifer@tigard-or.gov
No.The Lake Oswego-Tigard Water Treatment The simplest way to get rid of chlorine taste
Water Conservation? Plant does not add fluoride to the water. and odor is to place tap water in a container
Jennifer Joe ...... 503-718-2599 Fluoride is a naturally occurring trace and allow it to sit for a few hours.The taste
jennifer@tigard-or.gov element in surface and groundwater. and odor will dissipate with time.
You may want to consult with your dentist
Backflow Prevention?
Hung Nguyen .....503-718-2603 about fluoride treatment to help prevent How can Iget my water tested.
hung@tigard-or.gov tooth decay,especially for young children. Contact Tigard Public Works at
503-718-2591 for information about free
Water Emergencies? Is our water soft or hard? lead-in-water testing.For more extensive
Public Works ......503-718-2591 Our water is very soft.Most of the year testing,private laboratories can test your tap
After-hours Water Emergencies? the hardness ranges from 3-8 parts per water for a fee.Not all labs are accredited to
On-call Service .. 503-639-1554 million(ppm),or approximately%to%2 test for all contaminants.For information
a grain of hardness per gallon.During the about accredited labs,call the Oregon Health
General Inquiries? summer,some customers receive a blend of Authority,Oregon Environmental Laboratory
Public Works ..... 503-718-2591 groundwater from our aquifer storage and Accreditation Program at 503-693-4122.
recovery wells.The water from these wells
has a hardness of approximately 80 ppm
Are You Interested in (about 5 grains per gallon),which is deemed
Learning More about moderately hard.
Your Water?
If so,the Intergovernmental Water TESTS DUE JUNE 1
Board invites you to attend monthly It's Backflow Testing Time Again
meetings the second Wednesday of
each month at 5:30 p.m.in the If you have an in-ground lawn irrigation How do 1 get my device tested.
Tigard Public Works Auditorium system,you are required to have a backflow
Contact a person who is state-certified in
located at 8777 SW Burnham St.
prevention device.This important device testing backflow devices.This individual
Tigard,Oregon. prevents stagnant or contaminated water will perform the test and submit the results
from entering the drinking water supply. to the City of Tigard.The city maintains a
Backflow prevention devices have internal partial list of companies offering backflow
seals,springs and moving parts that testing services on the website listed below.
can fail.To ensure backflow devices are
functioning properly,state law requires What happens if I don't test my
property owners to test their devices device as required?
annually.A person who is state-certified in The city has the authority to shut off your
City of Tigard backflow testing must perform the test and water service.
PUBLIC WORKS DEPARTMENT submit the results to the City of Tigard.
13125 SW Hall Blvd.
Tigard, OR 97223 For more information visit www.tigard-orgov/backflow or contact Cross
Connection Specialist Hung Nguyen at 503-718-2603 or hung@tigard-orgov.
8 I 2016 Water Quality Report • City of Tigard Water Division