Summer 2019 Tdigar
CITY OF
The City of Tigard provides clean,safe,dependable OWEDOTION
MER
drinking water to the residents of Durham,King City, 19
two-thirds of Tigard,and the Tigard Water District. KN
2018 Annual Water Quality Report
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Where Does
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Come From?
S 0 U R C E I N F 0 R M A T 1 0 N
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Tarea of 940 square miles.Water is withdrawn from the Clackamas River,pumped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 entity supply system have paid big dividends for Tigard Water Service Area customers—customers
has representation on the Water have a new,resilient source of supply with excellent water quality.
Advisory Board. During periods of high water demand,Tigard supplements its supply with water from two
This report summarizes Tigard's city-owned aquifer storage and recovery(ASR)wells,and a native groundwater well.The ASR
2018 water quality data. wells are filled with water from Lake Oswego Tigard Water Treatment Plant in the winter when
Additional information is included people aren't using much water,then used as an additional source in the summer when we
to inform,educate and update need more water.
consumers on water issues affecting
the community.
Have a question about
this report?
/ Contact Environmental
Program Coordinator
Jennifer Joe at 503-718-2599 +
or Jennifer@tigard-or.gov. Umm
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2 1 2018 Water Quality Report • City of Tigard Water Division
Information on �: • •�`'
Detected Substances
Y"
n 2018,water delivered to the Turbidity is a measure of the amount �� ;� �}�►
TWSA met or surpassed all of sediment suspended in the water.This
regulatory requirements. sediment can interfere with disinfection
Tigard's water was tested for over 200 and provide a medium for microbial
regulated and unregulated contaminants, growth.Large storm events can result in CRYPTOSPORIDIUM
p
including testing throughout the TWSA increased turbidity.
distribution system. If a known health- In Untreated Clackamas
related contaminant is not listed in UNREGULATED CONTAMINANTS River Water
this report,it was not detected in
the drinking water. Water quality standards for unregulated Cryptosporidium is a harmful
contaminants provide information for micro-organism naturally present
development of future regulations and assist in surface water supplies through-
REGULATED CONTAMINANTS public water systems in managing drinking
out the world. Infection can cause
Federal standards regulate contaminants water for aesthetic considerations such as nausea, abdominal cramps and
to protect drinking water quality.These taste,color and odor.
standards limit the levels of contaminants diarrhea. Most healthy individuals
known to occur in water that can adversely Radon is a naturally occurring,radio- are able to overcome the disease
affect public health. active gas that cannot be seen,tasted or within a few weeks. However,
smelled.Radon is not currently regulated immuno-compromised people have
Chlorine is added to maintain disinfection and drinking water typically contributes more difficulty and are at greater
throughout the water distribution system, only 1 to 2 percent of a person's overall risk of developing severe, life
keeping the water safe as it travels to radon exposure.Radon has been detected threatening illnesses.
customers'homes and businesses. in water from Tigard's aquifer storage and
recovery wells and native groundwater well. Raw, untreated Clackamas River
Disinfection Byproducts — At the detected levels,radon is unlikely to water is tested for Cryptosporidium.
Haloacetic Acids (HAA) and contribute to adverse health effects.For more In 2016, three samples were
Total Trihalomethanes (THM)form information about radon,call the EPA's collected—one of the 10-liter
through chemical reactions between Radon Hotline at 800-SOS-RADON or visit samples contained a single
chlorine and naturally occurring organic www.epa.gov/radon Crypstosporidum.The detected
matter in the water.Careful control of the Cryptosporidium likely came from
disinfection process keeps byproduct levels Silica,Sodium and Sulfate are formed wildlife that live in the Clackamas
to a minimum,while maintaining the through the erosion of natural deposits and River Watershed. In 2017,twelve
disinfection we need. may be added to water during treatment. samples were collected and no
Nitrates and Nitrites form through the Cryptosporidium were detected.
deposits,erosion of natural de agricultural To learn about the health effects
p a gricuof contaminants, visit the Oregon Consistent with results from
activity and leaching of septic tanks. Health Authority website at: previous years,these recent test
Total Coliform Bacteria are naturally
http://www.oregon.govloha/PH/ results show a very low level of
present in the environment and may
HealthyEnvironments/DrinkingWater/ Cryptosporidium in the "raw"
indicate other potentially harmful bacteria Pages/index.aspx Clackamas River before it's treated.
may be present.Chlorine is added to the The water treatment system then
drinking water supply to kill these bacteria. protects consumers by filtering out
99.9%of Cryptosporidium in the
source water.
2018 Water Quality Report City of Tigard Water Division 1 3
2018 Water Quality AResults
Federal . 1. 1s regulate contaminants1 protect drinking water quality.
Tigard and its water11 partners test for1 . 00 regulated and unregulated contaminants.
Contaminant MCL MCLG TWSA Results Violation? Major Sources of
LOW F Range-* HIGH Yes/No Drinking Water
Fecal coliform and A routine sample 0 0%of samples with No Human and animal fecal
E.coli Bacteria and a repeat detectable E.coli or fecal waste
sample are total coliform bacteria
coliform positive
T
and one is also E.
coli positive
Total coliform bacteria Must not detect 0 0%of samples with No Naturally present in the
coliform bacteria detectable total coliform environment
in more than 5%of bacteria
samples per month
Turbidity(NTU) Cannot exceed 5 NA Highest single No Erosion of natural de-
NTU more than 2 measurement:0.11 posits
times in 12 months
i
Nitrate-Nitrogen(ppm) 10 10 :L2.1 2.7 No Found in natural aquifer
deposits;animal waste
DISINFECTION i BYPRODUCTS
Total Chlorine .
Residual Running 4 4 0.68 .81 No
Annual Average(ppm) : Additive used to
. disinfect water
Total Chlorine Residual NA NA 0.17 1.12 No
at Any One Site(ppm)
Bromate(ppb) 10 0 ND 1.10 No Byproduct of drinking wa-
ter treatment with Ozone
DISINFECTION BYPRODUCTS HALOACETIC
Haloacetic Acids-
Running Annual 60 NA 0.0044 0.0055 No
Byproduct of drinking
Average(ppm)
water disinfection
Haloacetic Acids Not Applicable NA 0.003 0.0075 No
at Any One Site(ppm)
4 1 2018 Water Quality Report • City of Tigard Water Division
2018
Water Quality Analysis
Federal standards regulate contaminants to protect drinking water quality.
Tigard and its water supply partners test for more than 200 regulated and unregulated contaminants.
4VMi
Contaminant MCL MCLG TWSA Results Violation? Major Sources of
LOW F Range 4 HIGH Yes/No Drinking Water
Total Trihalomethanes
Running Annual Average 80 NA 0.0084 0.0121 No Byproduct of drinking
(ppm) water disinfection
Total Trihalomethanes at NA NA 0.0062 0.0168 No
Any One Site(ppb)
Radon(pCi/L) No Standard No Standard 280 280 No
Silica(ppm) No Standard No Standard 27 32 No Found in
Sodium(ppm) No Standard No Standard 5.3 5.6 No natural deposits
Sulfate(ppm) No Standard No Standard 1.4 1.5 No
Contaminant 90th Number of Sites Exceeding MCLG Lead and Copper Action Level Typical Source
Percentile the Action Level Rule Exceedance Reached
0%of samples(0 out of 66) More than 10%of the
Copper(ppm) 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) 3.7 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,MROL:maximum residual disinfectant level,MRDLG:maximum residual
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.For complete definitions,see page 6.
2018 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
system must follow. disinfection and provide a medium for
microbial growth.
K• J
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
F 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.
F 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 2018 Water Quality Report • City of Tigard Water Division
What the EPA Says about
Drinking Water Contaminants
4 �
�p 5�� In order to ensure that tap water is safe to drink,the US
J�\ res Environmental Protection Agency(EPA) sets regulatory limits on
the amounts of certain contaminants in water provided by public
water systems.The Food and Drug Administration (FDA) sets `
limits on contaminants in bottled water,which must provide the
2 same protection for public health.
° Sign UpC PFtO"� The sources of drinking water(both tap water and bottled water)
include rivers,lakes,streams,ponds,reservoirs,springs,and wells.As for a Water Audit
water travels over the surface of the land or through the ground,it
dissolves naturally occurring minerals and,in some cases,radioactive material,and can pick up s a service to Tigard Water
substances resulting from the presence of animals or from human activity. AService Area customers,the
Because of this natural part of water's cycle,drinking water,including bottled water,may city now offers free Water Audits
contain small amounts of some contaminants.However,the presence of contaminants does not to help citizens find ways to use
necessarily indicate that the water poses a health risk. less water.
One of the most important things
Contaminants that may be present in source water include: that a homeowner can do to save
► Microbial contaminants,such as viruses and bacteria,which may come from wildlife or water is make sure that equipment
septic systems. is functioning appropriately and is
efficient.Water audits are performed
► Inorganic contaminants,such as salts and metals,which can occur naturally or result from during the spring and summer seasons
urban stormwater runoff,industrial or domestic wastewater discharges or farming. when watering yards begins.Saving
► Pesticides and herbicides,which may come from a variety of sources such as farming, money and saving water is what a
urban stormwater runoff and home or business use. water audit is all about. During a
visit to your home or business,Water
► Organic chemical contaminants,including synthetic and volatile organic chemicals,which Conservation Specialist Kevin McCaleb
are byproducts of industrial processes,and may come from gas stations,urban stormwater will assess equipment both inside
runoff and septic systems. and outside your home. He will offer
► Radioactive contaminants,which can occur naturally. suggestions to help improve the way
you manage your water so you can
More information about contaminants andpotential health effects is available from the EPA's save money and resources.
Safe Drinking Water Hotline(800-426-4791). Though the Water Conservation
Specialist won't look specifically for
SOURCE WATER ASSESSMENT leaks, he can generally detect if a leak
exists and often its most likely location.
In 2005,the Oregon Health Authority and the Department of Environmental Quality conducted When finished, he will provide you with
a source water assessment for the aquifer storage and recovery wells and the native groundwater a copy of the recommendations to help
well serving the Tigard Waster Service Area (TWSA).The purpose of the assessment was to you begin to make changes. An audit
identify potential sources of direct and indirect contamination in areas surrounding these wells. will identify not only the problems, but
The assessment identified 50 potential contaminant sources (natural and manmade) that could solutions as well.
affect the water quality if managed improperly.
Sign up online at
To view the assessment, contact Environmental Program Coordinator Jennifer Joe at www•tigard-or.gov/wateraudit
503-718-2599 orjennifer@tigard-or.gov.
2018 Water Quality Report • City of Tigard Water Division 1 7
FREOENTLY ASKED QUESTIONS
Qu,,..hons.oc
`__
TIGARD HAS THE ANSWERS!
Your Water Bill?
Utility Billing ....... 503-718-2460 about H2 0
Water Quality?
Jennifer Joe ...... 503-718-2599
jennifer@tigard-or.gov Is fluoride added to our groundwater from our aquifer storage and
drinking water? recovery wells.The water from these wells
Water Conservation? No.The Lake Oswego-Tigard Treatment has a hardness of approximately 80 ppm
Kevin McCaleb... 503-718-2591 about 5 rains per gallon),which is deemed
Plant does not add fluoride to the water. ( g P g )�
Backflow Prevention? Fluoride is a naturally occurring trace moderately hard.
Hung Nguyen .....503-718-2603 element in surface and groundwater.You
hung@tigard-or.gov may want to consult with your dentist about How can Iget my water tested.
Water Emergencies? fluoride treatment to help prevent tooth Contact Tigard Public Works at
Public Works ......503-718-2591 decay,especially for young children. 503-718-2591 for information about a free
lead-in-water testing kit.For more extensive
After-hours Water Emergencies? Is our water soft or hard. testing,private laboratories can test your tap
On-call Service .. 503-639-1554 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
General Inquiries? million (ppm),or approximately%to Y2 a about accredited labs,call the Oregon Health
Public Works ..... 503-718-2591 grain of hardness per gallon.During the Authority,Oregon Environmental Laboratory
summer,some customers receive a blend of Accreditation Program at 503-693-4122.
Interested in
Learning More
about Your Water? MEET OUR STAFF: What do you enjoy most about
Sam Morrison your job?
The Water Advisory Board invites In my early years,I enjoyed the construction
you to attend.The Board is charged work.I could go home at night and say, "I
with advising city council and staff did that."Now I really enjoy helping our
by making recommendations on customers with water issues.Nothing like a
significant water service topics. big thank you for your help.
r .' What is something unique about
working in water?
You would think that after 40 years of
service working in water that I would know
it all.Totally not the case.Our water system
is in a constant state of change and you
must learn and adapt.I am always learning.
How long have you worked for the What is one thing you wish people
City of Tigard? knew about your job?
City of Tigard I started my career in water works in 1978 I encourage customers to always call the city
PUBLIC WORKS DEPARTMENT with the Tigard Water District before it first with any water related issues.We might
13125 SW Hall Blvd. merged with the City of Tigard,so in total... not be able to help,but a first look from us is
Tigard, OR 97223 40 going on 41 years! free and we can help troubleshoot.
8 I 2018 Water Quality Report • City of Tigard Water Division