Loading...
2021 Annual Water Quality Report WATER QUA.. REPORT �. v CITY OF SUMMER R ©22 T *igar EDITION The City of •. • provides dependable drinking water to the residentsof Durham, • City,two-thirdsof •. • and Tigard Water District. Inside: Water Reservoir Project Update ► Tigard Water Source Information..2 ► Tigard Water Service Area Map....2 The City of Tigard is working to design and construct a new water reservoir. ► Learn More About Your Water.......2 This will ensure enough healthy, safe water to keep pace with the city's growth, ► Drinking Water Contaminants.......3 meet peak demand periods, and navigate emergencies and natural disasters. ► Source Water Assessment.............3 ► The Purpose of this Report............3 Reservoir Location: Sunrise Park Next Step: Community Engagement ► Information on After a detailed review,the technical project The Water Reservoir project will support Detected Substances.....................4 .cam has selected Sunrise Park as the best an engagement process for Tigar,1 Darl— u i R� ► Immuno-Compromised Notice.....4 location for reservoir construction. The Sunrise & Recreation to refine specific ways the ► Definitions.......................................5 Park property is located on Bull Mountain at Reservoir can enhance Sunrise Park.As an ► Lead...Are You at Risk?..................5 the northeast corner of SW 150th Avenue and added benefit,the Reservoir Project will ► Cryptosporidium............................5 Sunrise Lane. The site was selected for factors be able to leave the site in a condition that like favorable constructability, lower costs, allow for beneficial future park features. This III Water Quality AnalysisResults..67 easier permitting, and reduced construction could include some additional site grading to ► Frequently Asked Questions.........8 impacts to the surrounding neighborhood. allow for future trails or viewing areas for the surrounding natural areas. Questions? This is not the first time the city will co-locate ► Virtual Open House water and park infrastructure. Elizabeth Your Water Bill? Our whole community will have a UtilityBilling 503-718-2460 Price Park(13001 SW Bull Mountain Road) is chance to learn more about the g built atop an underground reservoir.Among preliminary reservoir design and p Water Quality? the ark's unique features is a windingprovide feedback on ways the Reservoir Jennifer Joe...........503-718-2599 interpretive trail that leads park-goers to a Jennifer@tigard-or.gov project can start to prepare Sunrise Park viewpoint and compass inlaid in concrete. for future development. This opportunity Water Conservation? will be hosted online in June on the Kevin McCaleb.......503-718-2591 project website: Backflow Prevention? _ www.engage.tigard-or.gov/reservoir. Hung Nguyen........503-718-2603 hung@tigard-or.gov / Community Advisory Committee Water Emergencies? Members will be responsible for reviewing Public Works..........503-718-2591 > and commenting on project materials.This After Hours Water Emergencies? includes providing input and advice to the On-Call Service......503-639-1554 project team. General Inquiries? Public Works...........503-718-2591 For more information visit: www.engage.tigard-or.gov/reservoir Want to learn more about your You're invited to attend: The Water Advisory Board a° .o x� Tri-Annual Virtual Meeting ME ^ 51 4H October 12, 2022 �# r � 4:30 p.m.—5:30 p.m. 'nGARD OUBMAMND - Visit tinyurl.com/2p8hbbpp ww for more information. °MX SCx00. The Oversight Committee _ , 3t A four-person advisory group with members from the City of Tigard and City of Lake Oswego City Councils. Visit lotigardwater.org for more information. The Committee provides oversight Where Does Tigard's Water Come From? on issues and topics of Partnership water operations, budgets and requests. Individual members In 2021, Tigard's drinking water system delivered water from the will deliver information and Lake Oswego-Tigard Water Treatment Plant with a supplemental recommendations to their respective supply from groundwater wells. City Councils as necessary. Lake Oswego-Tigard Water work in water conservation, emergency biological filtration. Treatment Plant preparedness, and regional coordination / Ballasted Flocculation uses The Lake Oswego—Tigard Treatment at regionalh2o.org. micro-sand and a coagulant to settle Plant withdraws water from the dirt, sediment and contaminants out of Clackamas River Basin which The Clackamas River Water Providers is a the water. coalition of the municipal water providers encompasses nearly 940 square miles. that get their drinking water from the / Ozone is then added to remove Drawn from the Clackamas River,the unpleasant taste and odor compounds River who are working pumped water moves through a pipeline together Clackamas s water resource issues. The and to provide advanced treatment. buried beneath the Willamette River to the purpose of the organization is to fund / Biological Filtration through a deep Lake Oswego—Tigard Water Treatment and coordinate efforts regarding source bed of granular activated carbon and Plant located in West Linn. water protection and public outreach silica sand removes any remaining tiny Who are our other partners? and education around watershed issues, microbes and contaminants, such as drinking water, and water conservation, cryptosporidium. Beneficial biological O addition to our partnership with Lake so that we can preserve the Clackamas activity removes organic molecules that Oswego, Tigard is also a member of the River as a high-quality drinking water can produce disinfection byproducts. Regional Water Providers Consortium and the Clackamas River Water Providers. source and minimize future drinking ► Filtered water is then disinfected water treatment costs while being using small amounts of chlorine The Regional Water Providers Consortium good stewards of the river. For more and the pH is adjusted with caustic provides leadership in the planning, information,visit: soda to prevent corrosion of management, stewardship, and resiliency www.clackamasproviders.org. household plumbing. of drinking water in the Portland, OR metropolitan region. They are comprised How is your drinking water Groundwater of 25 members which are located in treated? During periods of high water demand, the Clackamas, Columbia, Multnomah, The Lake Oswego-Tigard Treatment Tigard supplements its supply with Washington, and Yamhill Counties. This Plant uses a conventional treatment water from two city-owned aquifer year,the Consortium and its members process which includes ballasted storage and recovery wells, and a native are celebrating 25 years of service. Find flocculation, intermediate ozone, and groundwater well. All groundwater out more about the Consortium and its sources are disinfected using small amounts of chlorine. 2 1 2021 Water Quality Report • City of Tigard Water Division What the EPA Says About "ED STgT� - Drinking Water Contaminants In order to ensure that tap water is safe to drink,the US o Environmental Protection Agency(EPA) sets regulatory limits 2 `;, CIO— on the amounts of certain contaminants in water provided by public water systems. The Food and Drug Administration (FDA) *-qt q t PRott°c`° sets limits on contaminants in bottled water, which must provide the same protection for public health. 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 surface of the land or through the ground, it dissolves naturally occurring minerals and, in some WATER SYSTEM INFORMATION cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity. The purpose of Because of this natural part of water's cycle, drinking water, including bottled This Report water, may contain small amounts of some contaminants. However, the presence of contaminants does not necessarily indicate that the water poses a health risk. The City of Tigard is responsible for providing a clean, safe, Contaminants that may be present in source water include: dependable supply of drinking water to over 60,000 residents / Microbial Contaminants, such as / Organic Chemical Contaminants, in the Tigard Water Service Area viruses and bacteria,which may come including synthetic and volatile organic (TWSA). This service area includes from wildlife or septic systems. chemicals, which are byproducts of the cities of Durham, King City, industrial processes, and may come two-thirds of Tigard and the ► Inorganic Contaminants, such as salts Water District. Each entity and metals,which can occur naturally from gas stations, urban stormwater Tigard y runoff and septic systems. has representation on the Water or result from urban stormwater runoff, Advisory Board.The board offers industrial or domestic wastewater / Radioactive Contaminants, which can expert guidance to the Tigard City discharges or farming. occur naturally. Council on water-related matters. ► Pesticides and Herbicides,which may More information about contaminants come from a variety of sources such as and potential health effects is available This report summarizes Tigard's farming, urban stormwater runoff and2021 water quality data. from the EPA's Safe Drinking Water home or business use. Hotline 800-426-4791. Additional information is included to inform, educate and update consumers on water issues affecting the community. TWSA Have a question about k- this report? Source Water ��� ► Contact Assessment , t° Environmental Program 4 Coordinator Jennifer Joe at 503-718-2599 or In 2005,the Oregon Health Authority and the Department of Environmental Quality jennifer@tigard-or.gov. conducted a source water assessment for the aquifer storage and recovery wells and the native groundwater well serving the Tigard Water Service Area (TWSA). / Habla Espanol? The purpose of the assessment was to identify potential sources of direct and Este informe contiene indirect contamination in areas surrounding these wells. The assessment identified informacion importante acerca 50 potential contaminant sources(natural and manmade)that may affect the water de su agua potable. Haga que quality if managed improperly. To view the assessment, contact Environmental alguien to traduzca para Program Coordinator Jennifer Joe at 503-718-2599 or jennifer@tigard-or.gov. usted, o hable con alguien que to entienda. 2021 Water Quality Report • City of Tigard Water Division I 3 Information on Regulated Contaminants Detected Substances / Barium is a naturally occurring elements that can dissolve in the groundwater supply. In 2021,water delivered to the TWSA met all regulatory requirements. More than 90 contaminants are regularly sampled, / Chlorine is added to maintain disinfection requirements both before and after the water is treated,to ensure it meets throughout the water distribution system. the more than 120 water quality standards for drinking water set / Disinfection Byproducts- Haloacetic Acids(HAA) by the Environmental Protection Agency(EPA)and the State of land Total Trihalomethanes(THM)form through Oregon. If a known health-related contaminant is not listed in chemical reactions between chlorine and naturally this report,it was not detected in the drinking water. occurring organic matter in the water. The careful control of the disinfection process keeps byproduct s levels to a minimum, while maintaining the required levels of chlorine. / Nitrates and Nitrites form through the erosion of natural deposits, agricultural activity and leaching of septic tanks. / Total Coliform Bacteria are naturally present in the environment and may indicate other potentially harmful f bacteria may be present. Chlorine is added to the drinking water supply to kill these bacteria. / Turbidity is a measure of the amount of sediment What Else Do We Look For In Our Water? suspended in the water. This sediment can interfere The following list of chemicals and compounds are what we test with disinfection and provide a medium for for on a regular basis. Most chemicals are measured in parts per microbial growth. Large storm events can result in billion (ppb) or parts per million (ppm). increased turbidity. / Volatile Organic Compound (21 compounds) man made chemical compounds such as cleaning fluids, degreasers Detected Unregulated and plastics. / Contaminants Synthetic Organic Compounds(30 compounds) man made chemicals, including insecticides and herbicides. Unregulated water quality standards are established as ► Inorganic Compounds(16 compounds) naturally occurring guidelines to assist public water systems in managing minerals and chemicals that are released into water through drinking water for aesthetic considerations such as taste, erosion and leaching of mineral deposits. color, and odor. These contaminants do not present a risk to human health. Violation ► Magnesium, Potassium,Silica,Sodium and Sulfate From August 15, 2021 to November 9, 2021 the City of Tigard are formed through the erosion of natural deposits and did not designate a person of Direct Responsible in Charge of may be added to water during treatment. the water system and received a violation from the Oregon Health Authority. To learn about the health effects of contaminants,visit the Oregon Health Authority website at: public.health.oregon.gov/HealthyEnvironments/DrinkingWater/Monitoring/HealthEffects/Pages/index.aspx SPECIAL NOTICE FOR IMMUNO-COMPROMISED PERSONS Some people may be more vulnerable to contaminants in drinking water than the general population. Immuno-compromised persons such as persons with cancer undergoing chemotherapy, persons who have undergone organ transplants, people with HIV/AIDS or 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 providers. Environmental Protection Agency and Centers for Disease Control and Prevention guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and other microbial contaminants are available from the Safe Drinking Water Hotline (800-426-4791). 4 1 2021 Water Quality Report • City of Tigard Water Division ' Lead in the Drinking Water... Are You at Risk- If present, elevated levels of lead AWOL- Action Level(AL) can cause serious health problems, The concentration of a contaminant,which, if exceeded, especially for pregnant women and triggers treatment or other requirements that a water young children. Lead in drinking system must follow. water is primarily from materials and components associated with service Maximum Contaminant Level(MCL) lines and home plumbing. The City The highest level of a contaminant that is allowed in of Tigard is responsible for providing t drinking water. MCLs are set as close to the MCLGs as high-quality drinking water, but cannot feasible using the best available treatment technology. control the variety of materials used in plumbing components. When your Maximum Contaminant Level Goal(MCLG) water has been sitting for several hours,you can minimize the The level of contaminant in drinking water below which potential for lead exposure by flushing your tap for 30 seconds there is no known or expected risk to health. MCLGs allow to 2 minutes before using water for drinking or cooking. If for a margin of safety. you are concerned about lead in your water,you may wish to have your water tested. Information on lead in drinking water, Maximum Residual Disinfectant Level(MRDL) testing methods and steps you can take to minimize exposure is The highest level of a disinfectant allowed in available from the Safe Drinking Water Hotline (800-426-4791) drinking water.There is convincing evidence that or www.epa.gov/safewater/lead. addition of a disinfectant is necessary for control of microbial contaminants. Non-Detected(ND) CRYPTOSPORIDIUM Not detected at or above the MDL. is a micro-organism (protozoan) Not Applicable(NA) naturally present in surface Not applicable for the specified contaminant. supplieswater throughout world. Surface wa - supplies Nephelometric Turbidity Units(NTUs) pollutionare particularly vulnerable ifthey receive runoff or Turbidity is a measure of how clear the water looks. Turbidity can interfere with disinfection and provide a from human or animal wastes. medium for microbial growth. Since wildlife inhabit the Clackamas River Watersheds, Parts per Million(ppm)or Milligrams per Liter(mg/L) agencies . monitor A unit measurement describing the level of detected Cryptosporidium. Occasionally, montoring detects contaminants that is one part by weight of analyte to low levels of Cryptosporidium. one million parts by weight of the water sample. One part per million corresponds to one penny in$10,000 New national •. • •• of or approximately one minute in two years. One part per illness from ium. Symptoms of - • million is equal to 1,000 parts per billion. include nausea, abdominal cram• and • . Parts per Billion • • • ' able • overcome p (ppb)or Mircograms per Liter(µg/L) A unit measurement describing the level of detected disease within a few weeks. However, contaminants that is one part by weight of analyte to immuno-compromised people have more difficulty one billion parts by weight of the water sample.One part and are at greater risk of developing severe, life per billion corresponds to one penny in$10,000,000 or threatening illnesses. Immuno-compromised individuals approximately one minute in 2,000 years are encouraged to consult their doctor r'•• • • appropriate precautions to avoid infection. Treatment Technique(TT) Cryptosporidium must be ingested for it to cause A required process intended to reduce the level of a disease and may be spread through means other than contaminant in drinking water. drinking 2021 Water Quality Report • City of Tigard Water Division 1 5 2021 QUALM Federal standards regulate contamini Tigard and its water supply partners test for more t Contaminant MCL MCLG TWSA Results Violation? Major Sources LOW *- Range 4 HIGH Yes/ No in Drinking Water MICROBIOLOGICAL CONTAMINANTS A routine sample and a Fecal coliform and E.coli repeat sample are total 0 0%of samples with detectable E.coli No Human and animal fecal Bacteria coliform positive and one is or fecal coliform bacteria waste also E.coli positive Must not detect coliform 0%of samples with detectable total Naturally present in the Total coliform bacteria bacteria in more than 5%of 0 coliform bacteria No environment samples per month Cannot exceed 5 NTU more TT Turbidity(NTU) than 2 times in 12 months 0.3 in 95% Highest single measurement:0.085 No Soil runoff of samples DISINFECTION RESIDUAL Total Chlorine Residual Running 4 4 0.82 1.06 No Annual Average(ppm) Additive used to disinfect water Total Chlorine Residual at Any NA NA 0.41 1.27 No One Site(ppm) DISINFECTION BYPRODUCTS - HALOACETIC ACIDS Haloacetic Acids Running 60 NA 4.7 4.9 No Annual Average(ppb) Byproduct of drinking water disinfection Haloacetic Acids at Any One NA NA 3.6 7.2 No Site(ppb) DISINFECTION BYPRODUCTS - TOTAL TRIHALOMETHANES Total Trihalomethanes Running 80 NA 9.1 12.1 No Annual Average(ppb) Byproduct of drinking Total Trihalomethanes at Any water disinfection One Site(ppb) NA NA 5.9 23.4 No The definitions for the vocabulary listed above are available on page 5. q 6 1 2021 Water Quality Report City of Tigard Water Division ANALYSIS RESULTS ants to protect drinking water quality. han 200 regulated and unregulated contaminants. Contaminant MCL MCLG TWSA Results Violation? Drinking Water INORGANICS CONTAMINANTS Barium(ppb) 2,000 2,000 2 3 No Erosion of natural deposits Nitrate(ppm) 10 10 0.5 0.9 No UNREGULATED AND SECONDARY (REGULATIONS PROVIDE ADVISORY LIMITS ONLY) Magnesium(ppm) No Standard No Standard 3.4 6.10 No Potassium(ppm) No Standard No Standard 1.5 1.70 No Silica(ppm) No Standard No Standard 25 60 No Erosion of natural deposits Sodium(ppm) No Standard No Standard 5.6 7.9 No Sulfate(ppm) 250 250 2.2 7.3 No Contaminant90th Number of Sites Lead and Copper Action Level Percentile • • MCLG • Source Actionthe • • Level 0 samples(out of 34)exceeded More than 10%of the Copper(ppm) 0.0 the copper action level of 1.3 ppm 1.3 homes tested have levels No above 1.3 ppm Corrosion of household and 0 samples(out of 34)exceeded More than 10%of the commercial plumbing Lead(ppb) 0.0 the lead action level of 15 ppb 15 homes tested have levels No above 15 ppb low va ih- w 2021 Water Quality Report City of Tigard Water Division 7 City of • . • PRESIRT STD WORKSPUBLIC DEPARTMENT POSTAGE Blvd. PAID CITYOF 13125 SW Hall PORTLAND,OR Tigard Tigard, OR 97223 PERMIT#1350 ECRWSS POSTALCUSTOMER This report was printed on recycled paper with environmentally friendly inks.Please remember to recycle. (, FAOS ABOUT 411 s- .R How can I get my water Our water is very soft. Most of the tested? year the hardness ranges from IS fluoride added to our Contact Tigard Public Works at 3 8 parts per million(ppm),or drinking water? 503-718-2591 for information about approximately'/4 to'/z a grain of No.The Lake Oswego-Tigard a free lead-in-water testing kit. For hardness per gallon. During the Treatment Plant does not add fluoride more extensive testing, private summer and in times of emergency, to the water, but naturally occurring laboratories can test your tap water some customers receive a blend trace amounts may be present for a fee. Not all labs are accredited of groundwater from our aquifer when serving water from seasonal to test for all contaminants. For storage and recovery wells and groundwater sources(none was information about accredited labs, native groundwater well.The water detected in 2021).You may want to call the Oregon Health Authority, from these wells has a hardness consult with your dentist about fluoride Oregon Environmental Laboratory of approximately 60 ppm (about 5 treatment to help prevent tooth decay, Accreditation Program at grains per gallon),which is deemed 8 2021 Water Quality Report City of Tigard Water Division especially for young children. 503-693-4122. moderately hard.