Summer 2018 1 1
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liq 1 1111 1 1
Inside:
/ The Purpose of this Report.............2 I
Tigard Water Source Information.....2 i
/ Tigard Water Service Area Map.......2
Information on
Detected Substances......................3
/ Cryptosporidium ............................3
Water Quality Analysis Results....4-5
/ Lead...Are You at Risk?.................6
Definitions......................................6
/ Immuno-Compromised Notice........6 —+
M �
Drinking Water Contaminants..........7
/ Conservation Tips............................7
Source Water Assessment..............7
/ Frequently Asked Questions.............8
Are You Interested in Learning
More about Your Water?.................8 r
Backflow Testing Reminder............8
11 114,
5�
Where
' Tigard's
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Come 1
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�i S0URV. IN 0 R M ON
Tigard's main source of drinking water comes from
WATER SYSTEM INFORMATION the Clackamas River, one of the highest quality sources
The Purpose in the state.
of this Report he Clackamas River begins in Mount Hood National Forest,drawing from a watershed
Tarea of 940 square miles.Water is withdrawn from the Clackamas River,pumped
through a pipeline buried beneath the Willamette River,and treated at the Lake Oswego-
The City of Tigard is responsible for Tigard Water Treatment Plant in West Linn.The water goes through a robust treatment
providing a clean,safe,dependable process that includes filtration to remove dirt and organisms,ozone to remove substances
supply of drinking water to over that affect how the water tastes and smells,and disinfection to kill organisms and protect
60,000 residents in the Tigard Water the water as it goes through the distribution system.
Service Area(TWSA).This service
area includes the cities of Durham, The Lake-Oswego Water Treatment Plant expansion and the infrastructure that connects
King City,two-thirds of Tigard and the plant to the City of Tigard were completed in 2016.These investments in the water
the Tigard Water District.Each supply system have paid big dividends for Tigard Water Service Area customers—customers
entity has representation on the have a new,resilient source of supply with excellent water quality.
Intergovernmental Water Board that During periods of high water demand,Tigard supplements its supply with water from two
advises the Tigard City Council on city-owned aquifer storage and recovery(ASR)wells,and a native groundwater well.The ASR
water-related matters. wells are filled with water from Lake Oswego Tigard Water Treatment Plant in the winter when
This report summarizes Tigard's people aren't using much water,then used as an additional source in the summer when we
2017 water quality data. need more water.
Additional information is included
to inform,educate and update
consumers on water issues affecting
the community.
Have a question about
this report? WL
/ SCHOOL Contact Environmental P o s �°
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Program Coordinator ? qqq LIBIN $
Jennifer Joe at 503-718-2599 P L tltlLL BULL MouxTA�x RD .�00m051 v¢o c°yp RESFwOI"
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contiene informaci6n importante
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acerca de su agua potable.Haga que
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2 1 2017 Water Quality Report • City of Tigard Water Division
Information on0) .1t
• �
Detected Substances y
n 2017,water delivered to the may be present.Chlorine is added to the f v
TWSA met or surpassed all drinking water supply to kill these bacteria.
regulatory requirements. C
Tigard's water was tested for over 200 Turbidity is a measure of the amount
regulated and unregulated contaminants, of sediment suspended in the water.This CRYPTOSPORIDIUM
including testing throughout the TWSA sediment can interfere with disinfection
distribution system.If a known health- and provide a medium for microbial in Untreated Clackamas
related contaminant is not listed in growth.Large storm events can result in River Water
this report,it was not detected in increased turbidity.
the drinking water. Cryptosporidium is a harmful
UNREGULATED CONTAMINANTS micro-organism naturally present
Federal standards regulate contaminants in surface water supplies through-
to protect drinking water quality.These Water quality standards for unregulated out the world. Infection can cause
standards limit the levels of contaminants contaminants provide information for nausea, abdominal cramps and
known to occur in water that can adverselydevelopment of future regulations and assist
public water systems in managing drinking diarrhea. Most healthy individuals
affect public health. are able to overcome the disease
water for aesthetic considerations such as
taste,color and odor, within a few weeks. However,
REGULATED CONTAMINANTS immuno-compromised people have
Barium is a naturally occurring element Radon is a naturally occurring,radio- more difficulty and are at greater
that can dissolve into the groundwater active gas that cannot be seen,tasted or risk of developing severe, life
supply.At the levels found in the drinking smelled.Radon is not currently regulated threatening illnesses.
water,it is unlikely to contribute to adverse and drinking water typically contributes
health effects. only 1 to 2 percent of a person's overall Raw, untreated Clackamas River
radon exposure.Radon has been detected water is tested for Cryptosporidium.
Chlorine is added to maintain disinfection in water from Tigard's aquifer storage and In 2016, three samples were
throughout the water distribution system, recovery wells and native groundwater well. collected—one of the 10-liter
keeping the water safe as it travels to At the detected levels,radon is unlikely to samples contained a single
customers'homes and businesses. contribute to adverse health effects.For more Crypstosporidum.The detected
information about radon,call the EPAs Cryptosporidium likely came from
Disinfection Byproducts— Radon Hotline at 800-SOS-RADON or visit wildlife that live in the Clackamas
Haloacetic Acids (HAA) and www.epa.gov/radon River Watershed. In 2017,twelve
Total Trihalomethanes (THM)form samples were collected and no
through chemical reactions between Silica and Sodium are formed through
chlorine and naturally occurring organic the erosion of natural deposits and may be Cryptosporidium were detected.
matter in the water.Careful control of the added to water during treatment. Consistent with results from
disinfection process keeps byproduct levels previous years,these recent test
to a minimum,while maintaining the results show a ver low level of
disinfection we need. To learn about the health effects y
of contaminants, visit the Oregon Cryptosporidium in the "raw"
Nitrates and Nitrites form through the Health Authority website at: Clackamas River before it's treated.
erosion of natural deposits,agricultural http://Www.oregon.govloha/PH/ The water treatment system then
activity and leaching of septic tanks. HealthyEnvironments/DrinkingWater/ protects consumers by filtering out
Pages/index.aspx 99.9%of Cryptosporidium in the
Total Coliform Bacteria are naturally source water.
present in the environment and may N.
indicate other potentially harmful bacteria
2017 Water Quality Report City of Tigard Water Division 1 3
2017Water Quality
Federald.rds regulate contaminants to protect drinking water quality.
Tigard and its water supply partners test for more than 200 regulated and unregulated contaminants.
Contaminant MCL MCLG TWSA Results Violation? Major Sources of
LOW E Range-* HIGH Yes/No Drinking Water
Fecal coliform and A routine sample 0 0%of samples with detect- No Human and animal fecal
E.coli Bacteria and a repeat able E.coli or fecal coliform waste
sample are total bacteria
coliform positive
and one is also E.
coli positive
Total coliform bacteria Must not detect 0 1 of 76 samples in No Naturally present in the
coliform bacteria September had detectable environment
in more than 5%of coliform(<5%)
samples per month
Turbidity(NTU) Cannot exceed 5 Not Applicable Highest single No Erosion of natural
NTU more than 2 measurement:0.16 deposits
times in 12 months
Barium(ppm) 2 2 0.00164 0.00482 No
Nitrate-Nitrogen(ppm) 10 10 1.0 3.5 No Found in natural aquifer
deposits;animal waste
Total Chlorine
Residual Running 4 4 0.59 1.05 No
Annual Average(ppm) Additive used to
disinfect water
Total Chlorine Residual Not Applicable Not Applicable 0.14 1.27 No
at Any One Site(ppm)
M-4 Id
Haloacetic Acids-
Running Annual 60 Not Applicable 3.9 : 12.8 No
Average at Any One Site
(ppb) Byproduct of drinking
Haloacetic Acids water disinfection
Single Result Not Applicable Not Applicable 1.6 7.4 No
at Any One Site(ppb)
4 1 2017 Water Quality Report - City of Tigard Water Division
I
2017 Water Quality Analysis Results
Federal standards regulate contaminants to protect drinking water quality.
Tigard and its water supply partners test for more than 200 regulated and unregulated contaminants.
f
Contaminant MCL MCLG TWSA Results Violation? Major Sources of
LOW F Range 4 HIGH Yes/No Drinking Water
nynnn
i
Total Trihalomethanes
Running Annual 80 Not Applicable 9.1 20.5 No
Average at Any One Site
• Byproduct of drinking
(ppb) water disinfection
Total Trihalomethanes
Single Result at Any Not Applicable Not Applicable 7.0 23.2 No
One Site(ppb)
Radon(pCi/L) No Standard No Standard 260 350 No
Silica(ppm) No Standard No Standard 20 : 25 Found in
natural deposits
Sodium(ppm) No Standard No Standard 5.2 7.0 No
Contaminant 90th Number of Sites Exceeding MCLG Lead and Copper Action Level Typical Source
Percentile the Action Level Rule Exceedance Reached
Copper(ppm) 0%of samples(0 out of 66) More than 10%of the
0.0 exceeded the copper action 1.3 homes tested have levels No
level of 1.3 ppm above 1.3 ppm Corrosion
household and
3%of samples(2 out of 66) More than 10%of the commercial plumbing
Lead(ppb) 0.0 exceeded the lead action 0.0 homes tested have levels No
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.
2017 Water Quality Report • City of Tigard Water Division 1 5
Lead in the
Drinking Water. . . Definitions
Are You at Risk?
Action Level (AL):The concentration of Nephelometric Turbidity Units(NTUs):
a contaminant,which,if exceeded,triggers Turbidity is a measure of how clear the
treatment or other requirements that a water water looks.Turbidity can interfere with
J system must follow. disinfection and provide a medium for
microbial growth.
`- Maximum Contaminant Level (MCL):
The highest level of a contaminant that is Parts per Million(ppm)or Milligrams
allowed in drinking water.MCLs are set as per Liter(mg/L):A unit measurement
close to the MCLGs as feasible using the best describing the level of detected contaminants
available treatment technology. that is one part by weight of analyte to one
million parts by weight of the water sample.
7
Maximum Contaminant Level Goal One part per million corresponds to one penny
(MCLG):The level of contaminant in in$10,000 or approximately one minute in
If present, elevated levels of lead drinking water below which there is no known two years.One part per million is equal to
can cause serious health problems, or expected risk to health.MCLGs allow for a 1,000 parts per billion.
especially for pregnant women and margin of safety.
young children. Lead in drinking Parts per Billion(ppb)or Micrograms
water is primarily from materials and Maximum Residual Disinfectant Level per Liter(ug/L):A unit measurement
components associated with service (MRDL):The highest level of a disinfectant describing the level of detected contaminants
g
lines and home plumbing. allowed in drinking water.There is convincing that is one part by weight of analyte to one
evidence that addition of a disinfectant billion parts by weight of the water sample.
The City of Tigard is responsible is necessary for control of microbial One part per billion corresponds to one penny
contaminants. in$10,000,000 or approximately one minute
for providing high-quality drinking in 2,000 years.
water, but cannot control the variety
of materials used in plumbing Maximum Residual Disinfectant
Level Goal (MRDLG):The level of a Picocurries per Liter(pCi/L):
components.When your water has A standard measurement of radioactivity
been sitting for several hours,you drinking water disinfectant below which
can minimize the potential for lead
there is no known or expected risk of in water.
exposure by flushing your tap for health.MRDLGs do not reflect the benefits
of the use of disinfectants to control
30 seconds to 2 minutes before microbial contamination.
using water for drinking or cooking.
If you are concerned about lead in SPECIAL NOTICE FOR IMMUNO-COMPROMISED PERSONS
your water,you may wish to have Some people may be more vulnerable to contaminants in drinking water than the general
your water tested. Information on population.Immuno-compromised persons such as persons with cancer undergoing
lead in drinking water,testing chemotherapy,persons who have undergone organ transplants,people with HIV/AIDS or other
methods and steps you can take immune system disorders,some elderly,and infants can be particularly at-risk from infections.
to minimize exposure is available These people should seek advice about drinking water from their health-care providers.
from the Safe Drinking Water Hotline Environmental Protection Agency and Centers for Disease Control and Prevention guidelines
(800-426-4791)or www.epa.gov/ on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial
safewater/lead. contaminants are available from the Safe Drinking Water Hotline(800-426-4791).
6 1 2017 Water Quality Report • City of Tigard Water Division
What the EPA Says about
Drinking Water Contaminants
Ep STgr In order to ensure that tap water is safe to drink,the US ,�
J FS Environmental Protection Agency(EPA)sets regulatory limits on
the amounts of certain contaminants in water provided by public
c Z water systems.The Food and Drug Administration(FDA)setsLU '
o limits on contaminants in bottled water,which must provide the
Z same protection for public health.
The sources of drinking water(both tap water and bottled water) �M%Rs ��■■��■ -N•■�■■ ■■rte
q t
PR include rivers,lakes,streams,ponds,reservoirs,springs,and wells.As
Did you know. More than a trillion
water travels over the surface of the land or through the ground,it gallons of water are lost to minor
dissolves naturally occurring minerals and,in some cases,radioactive material,and can pick up water leaks every year in the U.S.
substances resulting from the presence of animals or from human activity.
Easy things you can do!Make sure
Contaminants that may be present in source water include: water leaks don't put a drain on your
► Microbial contaminants,such as viruses and bacteria,which may come from wildlife or wallet.Some easy things you can do
septic systems. at home are:
/ Ask for an irrigation audit, now
► Inorganic contaminants,such as salts and metals,which can occur naturally or result from available free to TWSA customers!
urban stormwater runoff,industrial or domestic wastewater discharges or farming. For more info and to sign up see
► Pesticides and herbicides,which may come from a variety of sources such as farming, http://www.tigard-or.gov/wateraudit
urban stormwater runoff and home or business use. ► Check your faucet washers and
gaskets and replace them if they're
► Organic chemical contaminants,including synthetic and volatile organic chemicals,which showing wear.
are byproducts of industrial processes,and may come from gas stations,urban stormwater
runoff and septic systems. 1 If your toilet is leaking, replace
your flapper valve—the most
► Radioactive contaminants,which can occur naturally. common cause of toilet leaks.A
"running"toilet can waste up to
Because of this natural part of water's cycle,drinking water,including bottled water,may "running"
a day!
contain small amounts of some contaminants.However,the presence of contaminants does not
necessarily indicate that the water poses a health risk. ► Check your landscape irrigation
system each spring to make sure
More information about contaminants and potential health effects is available from the EPA's it wasn't damaged by freezing over
Safe Drinking Water Hotline(800-426-4791). the winter.
When you buy new plumbing fixtures,
look for water-saving fixtures with the
SOURCE WATER ASSESSMENT certified WaterSense label!
In 2005,the Oregon Health Authority and the Department of Environmental Quality conducted
a source water assessment for the aquifer storage and recovery wells and the native groundwater
well serving the Tigard Waster Service Area(TWSA).The purpose of the assessment was to 1b
*,e—
S
identify potential sources of direct and indirect contamination in areas surrounding these wells.
The assessment identified 50 potential contaminant sources(natural and manmade) that could
affect the water quality if managed improperly.
To view the assessment, contact Environmental Program Coordinator Jennifer Joe at
s
503-718-2599 orjennifer@tigard-or.gov. EPA
2017 Water Quality Report • City of Tigard Water Division I 7
FREOENTLY ASKED QUESTIONS
Qmo
stions?
TIGARD .
Your Water Bill?
Utility Billing ....... 503-718-2460 � ' ,
utH20
Water Quality?
Jennifer Joe ...... 503-718-2599
jennifer@tigard-or.gov
Water Conservation? Is fluoride added to our groundwater from our aquifer storage and
Kevin McCaleb... 503-718-2591
drinking water? recovery wells.The water from these wells
Backflow Prevention? No.The Lake Oswego Tigard Treatment Plant has a hardness of approximately 80 ppm
Hung Nguyen .....503-718-2603 does not add fluoride to the water.Fluoride (about 5 grains per gallon),which is deemed
hung@tigard-or.gov is a naturally occurring trace element in moderately hard.
Water Emergencies? surface and groundwater.You may want
Public Works ......503-718-2591 to consult with your dentist about fluoride How can Iget my water tested.
treatment to help prevent tooth decay, Contact Tigard Public Works at
After-hours Water Emergencies? especially for young children. 503-718-2591 for information about a free
On-call Service .. 503-639-1554 lead-in-water testing kit.For more extensive
Is our water soft or hard. testing,private laboratories can test our to
General Inquiries? g�P Y P
Public Works ..... 503-718-2591 Our water is very soft.Most of the year water for a fee.Not all labs are accredited to
the hardness ranges from 3-8 parts per test for all contaminants.For information
million (ppm),or approximately%to Y2 a about accredited labs,call the Oregon Health
Interested in grain of hardness per gallon.During the Authority,Oregon Environmental Laboratory
summer,some customers receive a blend of Accreditation Program at 503-693-4122.
Learning More
about Your Water?
The Intergovernmental Water Board TESTS DUE JUNE 1
inv
tes you to attend monthly
lsecond Wednesday of each month ngs
It's Backflow Testing Time Again
at 5:30 p.m.in the Tigard Public Works
Auditorium located at: If you have an in-ground lawn irrigation How do I get my device tested.
8777 SW Burnham St.,Tigard,Oregon. system,you are required to have a backflow Contact a person who is state-certified in
prevention device.This important device testing backflow devices.This individual
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-or.gov/backflow or contact Cross
Connection Specialist Hung Nguyen at 503-718-2603 or hung@tigard-or.gov.
8 I 2017 Water Quality Report • City of Tigard Water Division