2015 Water Quality Report 1 1
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Inside:
► The Purpose of this Report.............2 s
► Tigard Water Source Information.....2
► 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 �f A
► Definitions......................................6
/ TWSA Source Water Assessment....6
► Drinking Water Contaminants..........7
► Immuno-Compromised Notice........7
/ Chlorine: Keeping
Drinking Water Safe.........................7
/ Frequently Asked Questions.............8
► Are You Interested in Learning .�
More about Your Water?.................8 r
► Backflow Testing Reminder............8
COVER PHOTO:Theo Grass, A
Public Works Day 2016
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S 0 U R C E I N F 0 R M A T 1 0 N
In 2015,the City of Tigard purchased nearly 90 percent of its water from three wholesale
water providers:Portland Water Bureau (PWB),the Joint Water Commission (JWC) and the
City of Lake Oswego.
Portland Water Bureau
The PWB manages the Bull Run Watershed,a surface water supply located in the Mt.Hood
National Forest.This watershed is 102 square miles and typically receives 80-170 inches of
WATER SYSTEM INFORMATION rainfall per year.PWB switches to its groundwater source—the Columbia South Shore Well
Field in cases of emergency,high demand or compromised water quality. All water received
The Purpose from PWB is unfiltered.
Joint Water Commission
of this Report The JWC draws surface water from the Trask and Tualatin River Watershed.It is piped
through the City of Beaverton's water distribution system,and contains added fluoride.
The City of Tigard is responsible for Lake Oswego-Tigard Water
providing a clean,safe,dependable Lake Oswego-Tigard currently withdraws water from the Clackamas River Basin.
supply of drinking water to over Encompassing nearly 940 square miles,the basin begins in the Mt.Hood National Forest.
60,000 residents in the Tigard Water Drawn from the Clackamas River,the pumped water moves through a pipeline buried
Service Area(TWSA).This service beneath the Willamette River to the Lake Oswego—Tigard Water Treatment Plant located in
area includes the cities of Durham, West Linn.
King City,two-thirds of Tigard and During periods of high water demand Tigard supplements its supplywith water from city-
the Tigard Water District.Each
entity has representation on the owned aquifer storage and recovery wells,and a native groundwater well.
Intergovernmental Water Board.The
board advises the Tigard City Council TIGARD WATER SERVICE AREA
on water-related matters.
■ ■ Tigard Water Service Boundary A
This re ort summarizes Tigars T u a l a t i n
2015 water quality data. Beaverton
P g � Tualatin Valley Water District
AA w aisle
Additional information is included ' ��D++
4 eill vice
to Inform,educate and update o��sFe r e a
Sc� '
consumers on water issues affecting
the community.
Tigard .�
Have a question about Water �
this report? I
Service
► Contact Environmental Program
Coordinator Jennifer Joe at 503-718- U i rwr
W i .oi
2599 or jennifer@tigard-or.gov. pre nte.
B The I—.
Wa a District �
► Habla Espanol?Este informe ,3
contiene informaci6n importante ;
3
acerca de su agua potable.Haga que King City
alguien to traduzca para usted,o •`' •oJ`r 3m
hable con alguien que to entienda. ' TualatinIr
4d/�
2 1 2015 Water Quality Report • City of Tigard Water Division
Information on Detected Contaminantsr
n 201 Ti ard's wholesale Turbidity is a measure of the amount
5, g ty
water providers monitored over of sediment suspended in the water.This
200 regulated and unregulated sediment can interfere with disinfection
contaminants,which include pesticides and provide a medium for microbial
and radioactive contaminants. In addition growth.Large storm events can result in r
to these efforts,Tigard staff concurrently increased turbidity.
tested the water quality throughout the -
TWSA distribution system. If a known UNREGULATED CONTAMINANT
MONITORING RULE Cryptosporidium
health-related contaminant is not
listed in this report,it was not The purpose of EPA's Unregulated
detected in the drinking water. Contaminant Monitoring Rule(UCMR)
is to collect nationwide data to help Cryptosporidium is amicro-organism
e
Federal standards regulate contaminants EPA to evaluate the occurrence e and (protozoan)naturally present in
to protect drinking water quality.These form regulatory decisions about,certain surface water supplies throughout
standards limit the levels of contaminants unregulated contaminants in drinking the world. Surface water supplies are
known to occur in water that can adversely water.While there are no established
particularly vulnerable if they receive
affect public health. federal guidelines for these substances, runoff or pollution from human or
REGULATED CONTAMINANTS states may choose to establish their own animal wastes.
Fluoride is a naturally occurring element guidelines.For example,the state of
that can dissolve into the groundwater California has adopted a state-specific Since wildlife inhabits the Bull Run
supply.At the levels found in the drinking drinking water standard of 10 ppb for and Clackamas River Watersheds,
water,it is unlikely to contribute to adverse hexavalent chromium,which took effect managing agencies regularly monitor
health effects. in 2015. for Cryptosporidium. Occasionally,
Chlorine is added to maintain disinfection UNREGULATED AND SECONDARY this monitoring detects low levels of
requirements throughout the water CONTAMINANTS Cryptosporidium.
distribution system. Radon is a naturally occurring,
Disinfection Byproducts- radioactive gas that cannot be seen,tasted New national standards further
Haloacetic Acids (HAA) and Total or smelled. Radon has been detected reduce the risks of illness from
Trihalomethanes (THM)form through at varying levels in water from Tigard's Cryptosporidium.Symptoms of
chemical reactions between chlorine aquifer storage and recovery wells and infection include nausea, abdominal
and naturally occurring organic matter native groundwater well.For more cramps and diarrhea.
in the water.The careful control of the information about radon,call the EPA's
disinfection process keeps byproduct levels Radon Hotline at 800-SOS-RADON or visit Most healthy individuals are able
to a minimum,while maintaining the www•epa.gov/radon/rnwater.html. to overcome the disease within
required levels of chlorine. Sodium is formed through the erosion of a few weeks. However, immuno-
Nitrates and Nitrites form through the natural deposits and may be added to water compromised people have more
erosion of natural deposits,agricultural during treatment. difficulty and are at greater risk of
activity and leaching of septic tanks. Sulfate is formed through the erosion of developing severe, life threatening
Total Coliform Bacteria are naturallv natural deposits and at high levels can illnesses. Immuno-compromised
present in the environment and may contribute to a salty taste and/or odor in individuals are encouraged to consult
indicate other potentially harmful bacteria water. their doctor regarding appropriate
may be present.Chlorine is added to the precautions to avoid infection.
drinking water supply to kill these bacteria. To learn about the health effects
of contaminants, visit the Oregon Cryptosporidium must be ingested for
Total Organic Carbon has no health Health Authority website at.
effects.However,total organic carbon it to cause disease and may be spread
http.//l.usa.gov/1 U9pRhz
provides a medium for the formation of through means other than drinking
disinfection byproducts including HAAs water.
and THMs.
2015 Water Quality Report City of Tigard Water Division 1 3
o. � a � z a � p tl °o •� a o a� g �® au �a g:a r � �: "� � a � i� �a -m� s �o elw� a�a �; .,
ContaminantMCL MCLG TWSA Results Violation? Major Sources of Contaminant MCL MCLG TWSA Results Violation? Typical Source
LOW F Range 4 HIGH YES/ NO Drinking Water LOW F Range-+ HIGH YES/NO
Fecal Coliform and A routine sample 0 0%of samples with No Human and animal Haloacetic Acids 60 NA 0.023 0.027 No
E.coli Bacteria and a repeat detectable E.Coli or fecal waste Running Annual
sample are total fecal coliform bacteria Average(ppb) Byproduct of drinking
coliform positive, water disinfection
and one is also Haloacetic Acids at� NA NA 0.004 0.036 No
E.coli positive Any One Site(ppb)
Total Coliform Must not detect 0 0%of samples with No Naturally present in
Bacteria coliform bacteria detectable total coliform the environment Total Trihalomethanes 80 0.026 0.031 No
in more than 5% bacteria Running Annual
of samples per Average(ppb) Byproduct of drinking
month Total Trihalomethanes NA NA 0.011 0.040 No water disinfection
Turbidity(NTU) Cannot exceed NA 0.20 2.99 No Erosion of natural at Any One Site(ppb)
5 NTU more deposits UNREGULATED AND SECONDARYadvisoryprov
than 2 times Radon(pCi/1) No Standard No Standard 279 407 No Erosion of natural
in 12 months
Sodium(ppm) 20 20 7.4 9.8 No deposits;water
Total Organic TT NA 0.67 1.84 No Naturally present in treatment additive
Carbon(ppm) the environment
INORGANICS � Sulfate(ppm) 250 250 1.0 2.5 No Naturally occurring
substance in
Arsenic(ppb) 10 0 <1.50 0.87 No drinking water
Barium ppm 2 2 0.001 0.005 No UNREGULATED CONTAMINATE
Chromium-Total' (ppb) 100 100 <0.5 0.2 No Found in natural deposits Chlorate(ppb) NA NA 24 156 7No7N&�rally
Copper(ppm) NA 1.3 <0.00050 0.001 No Chromium(ppb) NA NA 0.20 0.27
Fluoride(ppm) 4 4 <0.025 0.18 No Hexavalent Chromium- NA NA 0.029 0.081 occurring
Nitrite(ppm) 1 1 0.35 1.21 No Erosion of natural Dissolved(ppb) element
Nitrate(ppm) 10 10 0.02 1.13 No deposits; runoff from Strontium(ppb) NA NA 12 74 1 No
fertilizer; leaching from Vanadium(ppb) NA NA 0.27 19 No Naturally occuring
septic tanks and sewage
element metal
Lead(ppb) NA 0 <0.25 NA No Found in
natural deposits Contaminant 90th Number of Sites Exceeding MCLG Lead and Copper Action Typical Source
DISINFECTION RESIDUAL
Percen- the Actioni Level Rule Exceedance Level
the Reached
Total Chlorine 4 4 0.76 1.40 No Copper(ppm) 0.34 0%of samples(0 out of 1.3 More than 10%of the No
Residual Running 114%)exceeded the copper homes tested have levels Corrosion of household
Annual Average(ppm) Additive used to action level of 1.3 ppm above 1.3 ppm and commercial
Total Chlorine NA NA 0.03 3.40 No disinfect water Lead(ppb) 14 9.7%of samples(11 out of 0.0 More than 10%of the No plumbing
Residual at Any 114)exceeded the lead homes tested have levels
One Site(ppm) action level of 15 ppb above 15 ppb
1 During the year,tests with varying method reporting limits(MRLs)were used to analyze chromium.The sample with a result of<0.50 ppb was analyzed by a test with a less sensitive AL:action level,MCL:maximum contaminant level,MCLG:maximum contaminant level goal,MRDL:maximum residual disinfectant level,MRDLG:maximum residual
MRL and is why the minimum appears to be greater than the maximum. disinfectant level goal,MDL:method detection limit,NO: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.
4 1 2015 Water Quality Report • City of Tigard Water Division 2015 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 Parts per Million(ppm)or Milligrams
- available treatment technology.
-� per Liter(mg/L):A unit measurement
y Maximum Contaminant Level Goal describing the level of detected contaminants
(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
I allow for a margin of safety. one penny in$10,000 or approximately one
_ minute in two years.One part per million is
Maximum Residual Disinfectant equal to 1,000 parts per billion.
If present,elevated levels of lead Level (MRDL):The highest level of a
disinfectant allowed in drinking water. Parts per Billion(ppb)or Micrograms
can cause serious health problems, There is convincing evidence that addition per Liter(Ng/L):A unit measurement
especially for pregnant women and of a disinfectant is necessary for control of describing the level of detected contaminants
young children.Lead in drinking microbial contaminants. that is one part by weight of analyte to one
water is primarily from materials and billion parts by weight of the water sample.
Maximum Residual Disinfectant One art per billion corresponds to one
components associated with service P p p
Level Goal(MRDLG):The level of a penny in 10 000> approximately
one
lines and home plumbing.The City p y
000 or a roximatel
drinking water disinfectant below which minute in 2,000 years.
of Tigard is responsible for providing there is no known or expected risk of health.
high-quality drinking water,but MRDLGs do not reflect the benefits of the Picocurries per Liter(pCi/L):A
cannot control the variety of materials use of disinfectants to control microbial standard measurement of radioactivity in
used in plumbing components. contamination. water.
When your water has been sitting for Non-detected(ND):Not detected at or Treatment Technique(TT):A required
several hours,you can minimize the above the MDL. process intended to reduce the level of a
potential for lead exposure by flushing contaminant in drinking water.
your tap for 30 seconds to 2 minutes
before using water for drinking or
cooking.If you are concerned about TWSA SOURCE WATER ASSESSMENT
lead in your water,you may wish to In 2005,the Oregon Health Authority and the Department of Environmental Quality conducted
have your water tested.Information a source water assessment for the aquifer storage and recovery wells and the native groundwater
on 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 to identify potential sources of direct and indirect contamination in areas surrounding these
minimize exposure is available from wells.The assessment identified 50 potential contaminant sources(natural and manmade)
the Safe Drinking Water Hotline that may affect the water quality if managed improperly.
(800-426-4791)orwww.epa.gov/ To view a summary of the assessment, contact Environmental Program Coordinator
safewater/lead. jenniferjoe at 503-718-2599 orjennifer@tigard-or.gov.
6 1 2015 Water Quality Report • City of Tigard Water Division
What the EPA Says about CHLORINE:
Drinking Water Contaminants Keeping Drinking
In order to ensure that tap water is safe to drink,the US ��Eo FSrq,, Water Safe
Environmental Protection Agency(EPA)sets regulatory limits on
J� s
the amounts of certain contaminants in water provided by public < )
LU
water systems.The Food and Drug Administration sets limits 0 1,7/
on contaminants in bottled water,which must provide the same ti
protection for public health.
g� 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 chim n z
surface of the land or through the ground,it dissolves naturally occurring minerals and,in SIS1453
some cases,radioactive material,and can pick up substances resulting from the presence of
animals or from human activity.
Contaminants that may be present in source water include: American drinking water supplies are
► Microbial contaminants,such as viruses and bacteria,which may come from wildlife or among the safest in the world.It did
septic systems. not happen by accident,and our water
► Inorganic contaminants,such as salts and metals,which can occur naturally or result remains clean and healthy because
from urban stormwater runoff,industrial or domestic wastewater discharges or farming. of strong water quality standards
► Pesticides and herbicides,which may come from a variety of sources such as farming, safeguarding human health.
urban stormwater runoff and home or business use. Water suppliers have dramatically
► Organic chemical contaminants,including synthetic and volatile organic chemicals, improved water quality in the United
which are byproducts of industrial processes,and may come from gas stations,urban States by using water disinfectants in
stormwater runoff and septic systems. drinking water.Products like chlorine
were first used at the start of the 20th
► Radioactive contaminants,which can occur naturally. century,followed later by chloramine
(a mix of chlorine and ammonia).
Because of this natural part of the water cycle,drinking water,including bottled water,may These additions have drastically
contain small amounts of some contaminants.However,the presence of contaminants does reduced the incidence of deadly water-
not necessarily indicate that the water poses a health risk. borne illness such as cholera and
Drinking water,including bottled water,may reasonably be expected to contain at least small typhoid.Both are no longer considered
amounts of some contaminants.The presence of contaminants does not necessarily indicate public health threats,unlike in some
that water poses a health risk. developing countries.
More information about contaminants andpotential health effects is available from the The U,S.Centers for Disease Control
EPA's Safe Drinking Water Hotline at 800-426-4791. and Prevention has called public
drinking water disinfection and
treatment one of the greatest public
SPECIAL NOTICE FOR IMMUNO—COMPROMISED PERSONS health achievements of the 20th
century. (Learn more at:www.cdc.gov/
Some people may be more vulnerable to contaminants in drinking water than the general healthywater/drinking/history.html)
population.Immuno-compromised persons such as persons with cancer undergoing For more information on federal
chemotherapy,persons who have undergone organ transplants,people with HIV/AIDS or other regulations for clean drinking water,
immune system disorders,some elderly,and infants can be particularly at-risk from infections. visit the U.S.Environmental Protection
These people should seek advice about drinking water from their health-care providers. Agency website on the drinking water
Environmental Protection Agency and Centers for Disease Control and Prevention guidelines standards at:https://www.epa.gov/
on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial dwstandardsregulations.
contaminants are available from the Safe Drinking Water Hotline(800-426-4791).
2015 Water Quality Report - City of Tigard Water Division 1 7
Questions?
TIGARD HAS THE ANSWERS!
Your Water Bill? `
A
Utility Billing ............ 503-718-2460
ASKEDFREQUENTLY QUESTIONS
Water Quality?
Jennifer Joe............ 503-718-2599 Is our wa or ha
jennifer@tigard or.gov waver is very so f
Water Conservation? e� es from 3— n Aolit free
Jennifer Joe ........... 503-718-2599 m), ' d-in-water
jennifer@tigard-or.gov �";� - testing.For
f al ore extensive
Backflow Prevention?
--4 hard n '� _'� �, � r 'testing,private
Hung Nguyen ...........503-718-2603 .
hung@tigard or.gov llx. g � �, lbortories
. � :" a` .
� summery _ � can'test yQut-
Water Emergencies? some"chi stomer$ `� tap water for a
Public Works ...........503-718-2591 receive a bli ` " M«4 - fee.NoVl labs
of groundwater accredited
After-hours Water Emergencies? from our aquifer - 1:..Y�, ®� �' � to test for all
On-call Service ....... 503-639-1554
storage contaminants.
General Inquiries? reoftry wells. °' a For information
Public Works .......... 503-718-2591 %e OWr from � "� about accre�' d
these wells hasA labs,call the—
ah es_ a 7 Qyegon Health
approximate "� �, '� Autkorriity,Oregft
Are You Interested in 8Vpm (about„grains per gallon),which is Environmental LabQfjtory rey�ation
Learning More about deemedmoderately'kard. ' + ,p, Prograt 503-6+93-4122.
74.Your Water? u%ha is t e p f fro the water? � Ism a homebreurer and am interested
If so,the Intergovernmental Water The pH of Tig'ard's wa' typ tally ranges parameters Au asialinity,
calcium,chlridnd niagngium
Board invites you to attend monthly en 7.1-7 .
meetings the second Wednesday of q Nie the wate4 ere ca t this
each month at 5:30 p.m.in the What can I do aloutySie2*ste and information.
Tigard Public Works Auditorium
od#r in my wai?r? Unfol ately, ese parameters arameters are not
�
located at 8777 SW Burnham St., The simplest way to get rid of chlorine taste pri^ry contaminants and the City of Tigard
Tigard,Oregon. and odor is to place tap water in a does not for them.
container end allow it t. ' for a few hours. `
The taste and odor it
with tirile.
ti
City of Tigard Do you have an irrigation System?
PUBLIC WORKS DEPARTMENT REMINDER
13125 SW Hall Blvd. All Tigard Water Service Area customers are required to have their
Tigard, OR 97223 backflow prevention devices tested each year by June 1.
8 I 2015 Water Quality Report • City of Tigard Water Division