2020 INFORME DE CALIDAD DE AGUA - Denver Water
2020INFORME DE CALIDAD DE AGUAPhoto credit: iStock.Denver Water’s Public Water System Identification: CO0116001
3,100square miles of watersheds5mountain reservoirs3,000miles of pipe to carry waterPhoto credit: iStock.
WHAT IS THIS REPORT?The Environmental Protection Agencyrequires public water suppliers thatserve the same people year-round(community water systems) to provideconsumer confidence reports to theircustomers. These reports are alsoknown as annual water quality reports.This report summarizes informationregarding water sources used, anydetected contaminants, complianceand educational information.Where does yourwater come from?Denver’s drinking watercomes from rivers, lakes,streams, reservoirs andsprings fed by high-quality mountainsnow runoff. Denver Water’s supply is100% surface water that originates insources throughout 3,100 square milesof watersheds on both sides of theContinental Divide.a source water assessment of thepotential for contaminants reachingany of Denver Water’s three terminalreservoirs at Strontia Springs, Marstonand Ralston, the last stop for the waterbefore it is treated. The potentialsources of contamination that may existare: EPA areas of concern; permittedwastewater discharge sites; aboveground, underground and leakingstorage tank sites; solid waste sites;existing or abandoned mine sites; otherfacilities; commercial, industrial andtransportation activities; residential,urban recreational grasses; quarries,strip mines and gravel pits; agriculture;forests; septic systems; oil and gaswells; and roads.Mountain water sourcesDenver Water’s water sources are theSouth Platte River and its tributaries, thestreams that feed DillonReservoir, and the creeksand canals above the FraserRiver. Denver Water storesits water in five mountain reservoirs:Antero, Eleven Mile Canyon, Cheesman,Dillon and Gross. From these reservoirs,the water is then sent to the metro areathrough a complex system of streams,canals and pipes.After treatment, drinking water isfed by both gravity and pumps to asystem of underground, clean-waterreservoirs before continuing to yourhome or business. More than 3,000miles of pipe carry water to DenverWater customers.Source waterassessmentThe Colorado Departmentof Public Health andEnvironment has completed1 2020 Water Quality Report For more information on the report,contact the Colorado Departmentof Public Health and Environmentby calling 303-692-2000 or visitColorado.gov/cdphe/ccr. The reportis located under “Guidance: SourceWater Assessment Reports.” Searchthe table using 116001 Denver WaterBoard. Or call Denver Water CustomerCare at 303-893-2444.Información importanteacerca de la calidad del aguaPara recibir la versión en español delInforme de Calidad de Agua de 2020 deDenver Water, llame a Servicioal cliente al 303-893-2444 o visitedenverwater.org/CalidadDeAgua.
SOURCES OFDRINKING WATERDENVER WATER’SSYSTEMDevoted to water qualityPhoto credit: iStock.Sources of drinking water include rivers,lakes, streams, ponds, reservoirs, springs andwells. As water travels over the surface ofthe land or through the ground, it dissolvesnaturally occurring minerals and, in somecases, radioactive material. It can also pick upsubstances resulting from human activity andthe presence of animals. Contaminants mayinclude the following:Microbial contaminantsViruses, bacteria and other microbes thatmay come from sewage treatment plants,septic systems, agricultural livestockoperations and wildlife.Inorganic contaminantsSalts and metals, which can be naturallyoccurring or result from urban stormwaterrunoff, industrial or domestic wastewaterdischarges, oil and gas production, miningor farming.Pesticides and herbicidesChemical substances resulting from a varietyof sources, such as agricultural and urbanstormwater runoff, and residential uses.Organic chemical contaminantsSubstances including synthetic and volatileorganic chemicals, which are byproductsof industrial processes and petroleumproduction, that may come from gas stations,urban stormwater runoff and septic systems.Radioactive contaminantsSubstances that can be naturally occurring orbe the result of oil and gas production, andmining activities.Denver Water proudly serves high-quality water to 1.5 millionpeople in the city of Denver and many surrounding suburbs.Since 1918, we have expertly planned, developed and operateda complex system that provides clean, safe, great-tasting water.Denver Water is a public agency funded by water rates, new tapfees and the sale of hydropower, not taxes. We are Colorado’soldest and largest water utility — Denver Water has a total waterservice area of approximately 300 square miles.Denver Water serves 25% of the state’s population with less than2% of all the water used in the state. The natural environment isour lifeline, and we help protect it by promoting wise water use.We take our water quality very seriously. Last year, we collectedmore than 35,000 samples and conducted more than 70,000tests to ensure our water is as clean and safe as possible. DenverWater vigilantly safeguards our mountain water supplies, andthe water is carefully treated before it reaches your tap. Thisbrochure provides data collected throughout 2019.ReservoirDillonCapacityPercent of(acre-feet) Total Capacity257,30437.1Eleven Mile Canyon97,77914.1Williams field(Denver's portion)27,0764.0Wolford Mountain(Denver's lston10,7761.5Strontia Springs7,8631.1Meadow Creek5,3700.8Long Lakes1,7870.3Platte Canyon9100.1Soda Lakes6450.1692,846100Total2 2020 Water Quality Report
Photo credit: Denver Water.WATER AT A GLANCEAll drinking water, including bottledwater, may reasonably be expectedto contain at least small amounts ofsome contaminants. The presence ofcontaminants does not necessarilyindicate that the water poses a healthrisk. In order to ensure that tap water issafe to drink, the Colorado Departmentof Public Health and Environment’sregulations set limits on the amount ofcertain contaminants in water providedby public water systems. The Foodand Drug Administration sets limits forcontaminants in bottled water to providesimilar protection for public health.undergone organ transplants, peoplewith HIV/AIDS or other immunesystem disorders, some elderly andinfants, can be particularly at risk ofinfections. These people should seekadvice about drinking water from theirhealth care providers. Guidelines fromthe EPA and the Centers for DiseaseControl and Prevention on appropriatemeans to lessen the risk of infection bycryptosporidium and other microbialcontaminants are available from the SafeDrinking Water Hotline, 800-426-4791.Lead in drinking waterMore information about contaminantsand potential health effects can beobtained by calling the EPA’s SafeDrinking Water Hotline at 800-426-4791or by visiting epa.gov/ground-waterand-drinking-water.Denver Water is committed to deliveringsafe water to our customers. The waterwe provide to homes and businessesis lead-free, but lead can get into thewater as it moves through customerowned water service lines and householdplumbing that contain lead.Some people may be more vulnerableto contaminants in drinking waterthan the general population.Immunocompromised people, suchas people with cancer undergoingchemotherapy, people who haveService lines bring water into a homeor building from Denver Water’s maindelivery pipe in the street. In DenverWater’s experience, homes built prior to1951 are more likely to have lead servicelines. Homes built before 1987 may have3 2020 Water Quality Report lead solder connecting copper pipesin their plumbing. Faucets and fixturesmade before 2014 do not meet today’s“lead-free” requirements.Lead exposure can cause serious healthproblems, especially for pregnantwomen and young children.To address this issue, Denver Water haslaunched the Lead Reduction Program,which was approved in December 2019by the EPA and Colorado Department ofPublic Health and Environment.The Lead Reduction Programhas five main components: Increasing the pH level of the waterto reduce the risk of lead fromgetting into drinking water fromlead service lines or householdplumbing. This change is beingdone to reduce the corrosivity ofthe water, which will help protectcustomers who have plumbing intheir home that contains lead, suchas customer-owned water servicelines that connect their home toDenver Water’s main delivery pipe
in the street, solder that connectssections of pipe in their home, andfaucet parts. Developing and maintaining apublicly accessible inventory of allcustomer-owned lead service linesin Denver Water’s service area.This interactive map is available atdenverwater.org/Lead.Replacing all lead service linesover 15 years at no direct chargeto the customer. Providing a free water pitcher andfilters that are certified to removelead to all customers suspected ofhaving a lead service line, for useuntil six months after their serviceline is replaced. Ongoing communication, outreachand education.How the program came to beSince 1992, as part of the EPA’s Leadand Copper Rule, Denver Water hasmonitored water quality in homes thathave lead service lines or plumbing thatcontains lead.In 2012, water quality sample resultsfrom homes with known lead servicelines and plumbing exceeded the levelthe EPA requires for taking action. Theaction level is an indicator that additionalsteps may need to be taken to “optimizecorrosion control treatment.” Thatmeans a utility may need to adjust itswater treatment to minimize the risk oflead getting into drinking water fromlead pipes and plumbing. Denver Waterstudied multiple treatment options from2012 to 2017. Based on the results,the Colorado Department of PublicHealth and Environment in March 2018required Denver Water to begin addingorthophosphate to the water it deliversin March 2020.Orthophosphate is a food additivecommonly added to water to minimizecorrosion and reduce the amount of leadreleased from pipes and fixtures. It hasbeen safely and successfully used acrossthe country. Orthophosphate can impactwastewater treatment plants and thedownstream environment.Denver Water proposed a holistic,alternative approach to orthophosphatethat removes lead at its source. Theapproach focuses on replacing alllead service lines in the service areaand avoids the potential impacts oforthophosphate to wastewater treatmentplants and downstream reservoirs,streams and rivers.That proposal became the LeadReduction Program, which isnow underway. Learn more aboutthis effort and the program atdenverwater.org/Lead.If you are concerned about lead, youcan request to have your water tested.Information on lead in drinking water,HOW TO MINIMIZE YOUREXPOSURE TO LEADFlushIf water has not been used in the home for a fewhours, such as first thing in the morning or whengetting home from work, run the kitchen or anybathroom faucet for five minutes. You also can runthe dishwasher, take a shower, or do a load of laundry tohelp flush water in your home’s plumbing before drinkingor cooking.Use only cold water for drinking, cooking and makinginfant formula. Boiling the water does not remove lead.testing and steps to minimize exposureis available from the Safe DrinkingWater Hotline at 1-800-426-4791,at epa.gov/safewater/lead and atdenverwater.org/Lead.Lead may exist in other areas of yourhome. For a complete list and moreinformation, visit colorado.gov/cdphe/lead-what-are-common-sources.Is there a presence ofcryptosporidium and giardia?Denver Water has tested forcryptosporidium (crypto) and giardia inboth source and treated water since the1980s. Since that time, Denver Waterhas never detected a viable indication ofeither in the drinking water.Crypto and giardia are microscopicorganisms that, when ingested, cancause diarrhea, cramps, fever and othergastro-intestinal symptoms. Crypto andgiardia are usually spread through meansother than drinking water.While most people readily recover fromthe symptoms, crypto and giardia cancause more serious illness in people withcompromised immune systems. Theorganisms are in many of Colorado’s riversand streams and are a result of animalwastes in the watershed. At the treatmentplants, Denver Water removes crypto andgiardia through effective filtration, andgiardia is also killed by disinfection.FilterUse filtered water for drinking (including makingtea and coffee), cooking (particularly whenmaking foods like rice, beans and soup) andpreparing infant formula. Be sure the filter is NSFcertified to remove lead. Visit nsf.org forfilter options.MaintainRegularly clean your faucet’s screen, also known asan aerator. You can find an instructional video atdenverwater.org/Lead.Replace filters at the manufacturer’s recommendedschedule.4 2020 Water Quality Report 20192020 WaterWater QualityQualityReportReport 5
WATER QUALITY MONITORING VIOLATIONFindings from the Colorado Department of Public Health and Environment’s 2019 Sanitary Surveyresulted in notification to Denver Water on Sept. 19, 2019, of two violations of Regulation 11.What happened?Regarding the first violation, inspectors noted that Denver Water regularly conducts tankinspections and has some written standard operating procedures regarding its storagetank inspections. However, Denver Water's standard operating procedures were notcomprehensive enough to meet all the state's requirements for storage tank inspections. Theincomplete procedures did not allow Denver Water to successfully and consistently implementits storage tank inspection plan for all its storage tanks.In the second violation, Denver Water was monitoring and reporting the combined filter effluentturbidity for the Foothills Water Treatment Plant using a sample line from the treatment plant’sclear well. However, Denver Water should have been reporting the combined filter effluentturbidity from our monitoring location nearer to the combined filter effluent. Turbidity values ateach of these locations were similar, but this reporting error violates drinking water requirements.How did this impact water quality?Denver Water monitors water quality throughout the Denver-metro area 24/7/365, to ensurethe water meets drinking water standards, which verifies that the drinking water system wasnot compromised as a result of these violations.What is being done (corrective action)?Your water is safe to drink, and water quality was never compromised. With regard to the firstviolation, Denver Water is updating its storage tank inspection plan this year to reflect therecommendations made by the health department. The second violation was corrected in2019 by switching sample sites per health department recommendations.For more information, contact Denver Water Customer Care at 303-893-2444. You can read moreabout our extensive treatment process at denverwaterTAP.org.Please share this information with all other people who drink this water, especially thosewho may not have received this notice directly (for example, people in apartments, nursinghomes, schools and businesses). You can do this by posting this notice in public places or bydistributing copies by hand.Technical description of violations1. F330 — Management:Storage Tank Inspection Plan (T3): Supplier has not developed or maintained a finished waterstorage tank inspection plan. This is a violation of Regulation 11, Section 11.28(4)(a).At the time of the sanitary survey, the department found that the supplier appears to regularlyconduct tank inspections and has some written standard operating procedures (SOPs) regardingits storage tank inspections. However, the supplier’s SOPs are not comprehensive and completeto meet all the required elements of the written plan for storage tank inspections as specifiedin Section 11.28(2) of Regulation 11 and to allow the supplier to successfully and consistentlyimplement its storage tank inspection plan for all its storage tanks.2. R529 — Monitoring, Recordkeeping and Data Verification:Monitoring Turbidity (T3): Supplier was not properly monitoring and/or recording turbidityvalues. This is a violation of Regulation 11, Section 11.8(1)(2).At the time of the sanitary survey, the supplier was monitoring and reporting the combinedfilter effluent (CFE) turbidity for the Foothills Water Treatment Plant using a sample line from thetreatment plant’s clear well. However, the supplier has the ability to monitor CFE turbidity at acommon header for all individual filter effluents prior to entering the clear well.These violations do not pose a safety risk to customers and do not require consumers totake action, but you have a right to know what happened and what we have done to correctthis situation.5 2020 Water Quality Report THE TREATMENTPROCESSThe treatment process consistsof five RATION4DISINFECTION5CORROSIONCONTROLRaw water is drawn into mixingbasins at our treatment plantswhere we add alum and polymer.This process causes smallparticles to stick to one another,forming larger particles.Over time, the now largerparticles become heavy enoughto settle to the bottom of a basinfrom which sediment is removed.The water is then filteredthrough layers of fine, granulatedmaterials — either sand, orsand and coal, depending onthe treatment plant. As smaller,suspended particles are removed,turbidity diminishes and clearwater emerges.As protection against anybacteria, viruses and othermicrobes that might remain,disinfectant is added before thewater flows into undergroundreservoirs throughout thedistribution system and intoyour home or business. DenverWater carefully monitors theamount of disinfectant addedto maintain quality of the waterat the farthest reaches of thesystem. Fluoride occurs naturallyin our water but is also added totreated water, when needed, toachieve public health levels.pH is maintained by addingalkaline substances to reducecorrosion in the distributionsystem and the plumbing in yourhome or business.
REGULATED WATER CONTAMINANTS: WHAT IS IN THE WATER?Data collected throughout 2019Inorganic Contaminants Sampled at the Entry Point to the Distribution geRangeUnit BRLppb66NoDischarge from petroleum refineries, fireretardants, ceramics, electronics, solder.Arsenic2019MonthlyBRLBRLppb100NoErosion of natural deposits, runoff fromorchards, runoff from glass and pb20002000NoErosion of natural deposits, discharge ofdrilling wastes.Beryllium2019MonthlyBRLBRLppb44NoDischarge from metal refineries and coalburning factories; discharge from electrical,aerospace, and defense n of galvanized pipes, erosionof natural deposits, discharge from metalrefineries, runoff from waste batteriesand ge from steel and pulp mills,erosion of natural deposits.Copper2019Monthly0.79BRL-2.3ppb1300 (AL)1300NoErosion of natural deposits.Typical SourcesMercury2019MonthlyBRLBRLppb22NoErosion of natural deposits; dischargefrom refineries and factories; runoff fromlandfills and rge from petroleum and metalrefineries; erosion of natural deposits;discharge from mines.Thallium2019MonthlyBRLBRLppb20.5NoErosion of natural deposits; dischargefrom refineries and factories; runoff fromlandfills and on of natural deposits, mine drainage.Fluoride2019Monthly0.540.13-0.76ppm4.0 (2.0 isSMCL)4NoErosion of natural deposits, water additivethat promotes strong teeth, discharge fromfertilizer and aluminum factories.Nitrate as N2019Monthly0.02BRL-0.13ppm1010NoRunoff from fertilizer use; leachingfrom septic tanks, sewage; erosion ofnatural deposits.Nitrite as N2019MonthlyBRLBRLppm11NoRunoff from fertilizer use; leachingfrom septic tanks, sewage; erosion ofnatural 070NoRunoff from herbicide used on row crops.TERMS, ABBREVIATIONS, AND SYMBOLSSome of the terms, abbreviation and symbols are unique to the water industry and might not be familiar to all customers. Terms used in the table are explained below.Action Level (AL)The concentration of a contaminant, whichif exceeded, triggers treatment or otherrequirements that a water system mustcomply with.Level 1 AssessmentA study of the water system to identify potentialproblems and determine (if possible) whytotal coliform bacteria have been found in ourwater system.Maximum Residual Disinfection Level (MRDL)The highest level of a disinfection allowed indrinking water. There is convincing evidence thataddition of a disinfection is necessary for control ofmicrobial contaminantsAverageTypical ValueLevel 2 AssessmentA very detailed study of the water system to identifypotential problems and determine (if possible) whyan E. coli MCL violation has occurred and/or whytotal coliform bacteria have been found in our watersystem on multiple occasions.Maximum Residual Disinfection Level Goal (MRDLG)The level of a drinking water disinfectant, below whichthere is no known or expected risk to health. MRDLGsdo not reflect the benefits of the use of disinfectantsto control microbial contaminants.Below Reporting Level (BRL) Below thereportable level for an analysis or below thelowest reliable level that can be measured.Compliance ValueSingle or calculated value used to determine if aregulatory contaminant level is met. Examplesof calculated values are the Average, 90thPercentile, Running Annual Average, LocationRunning Annual Average.ContaminantA potentially harmful biological, chemical, orradiological substance.Formal Enforcement Action Escalated actiontaken by the stat to bring a noncompliant watersystem back into compliance.Health-BasedViolation of either an MCL or TT.Locational Running Annual Average (LRAA) Theaverage of sample results for samples collected ata monitoring location during the most recent fourcalendar quarters.Maximum Contaminant Level (MCL)Maximum level of a contaminant allowed indrinking water.Maximum Contaminant Level Goal (MCLG) Thelevel of a contaminant in drinking water below whichthere is no known or expected risk to health. MCLGsallow for a margin of safety.Nephelometric Turbidity Unit (NTU)Measure of the clarity or cloudiness of water.Turbidity in excess of 5 NTU is just noticeable to thetypical person.Non-Health-BasedA violation that is not an MCL or TT.Not Applicable (N/A)Does not apply or not available.Parts per billion Micrograms per liter (ppb µg/L)Equivalent to micrograms per liter. One ppb iscomparable to one drop of water in 55,000 gallons.Parts per million Milligram per liter (ppm mg/L)Equivalent to milligrams per liter. One ppm iscomparable to one drop of water in 55 gallons.6 2020 Water Quality Report Picocuries per liter (pCi/L)Measure of the radio activity in water.RangeThe lowest value to the highest value.Running Annual Average (RAA)The average of sample results for samplescollected during the most recent fourcalendar quarters.Secondary Maximum Contaminant Level (SMCL)Nonenforceable, recommended limits forsubstances that may affect the taste, odor, color orother aesthetic qualities of drinking water.Treatment TechniqueA required process intended to reduce the level ofa contaminant in drinking water.Variance and ExemptionsDepartment permission not to meet an MCL or TTunder certain conditions.ViolationFailure to meet a Colorado Primary DrinkingWater regulation.Water Treatment Plant (WTP)Water Treatment Plant
Secondary Contaminants Sampled at the Entry Point to the Distribution ageRangeUnit ofMeasureMCLMCLGMCLViolationTypical SourcesAluminum2019Monthly24.310.9-40.4ppb50 - 200 (SMCL)N/ANoErosion of natural deposits, watertreatment aturally occurring*Secondary standards are non enforceable guidelines for contaminants that may cause cosmetic effects (such as skin or tooth discoloration) or aesthetic effects (such as taste, odor, or color) in drinking water.Summary of Turbidity Sampled at the Entry Point to the Distribution SystemChemicalParametersYearSamplingFrequencyLevel FoundUnit ofMeasureTurbidity2019DailyHighest single measurement: 0.135NTU (March, Moffat Treatment Plant)NTUTurbidity2019DailyLowest monthly percentage ofsamples meeting TT requirement forour technology: 100%NTUTreatment TechniqueRequirementTreatment TechniqueViolationTypicalSourcesMaximum 1 NTU for any onesingle measurement.NoSoil runoffIn any month, at least 95% ofsamples must be less than0.3 NTU.NoSoil runoffTurbidity has no health effects. However, turbidity can interfere with disinfection and provide a medium for microbial growth. Turbidity may indicate the presence of disease-causing organisms. Theseorganisms include bacteria, viruses, and parasites that can cause symptoms such as nausea, cramps, diarrhea, and associated headaches.Total Organic Carbon (Disinfection Byproducts Precursor) Removal Ratio of Raw and Finished Water*ChemicalParametersYearFrequencyTreatment Technique RequirementTreatment TechniqueViolationTotal organiccarbon ratio2019Twice permonth**Denver Water uses enhanced treatment to removethe required amount of natural organic material and/ordemonstrates compliance with alternative criteria.NoTypical SourcesNatural organic matter present inthe environment.**Total organic carbon (TOC) has no health effects. However, total organic carbon provides a medium for the formation of disinfection byproducts including trihalomethanes (TTHMs) and haloacetic acids (HAA5s).Drinking water containing these byproducts in excess of the MCL may lead to adverse health effects, liver or kidney problems, or nervous system effects, and may lead to an increased risk of getting cancer.Disinfection Byproducts Sampled in the Distribution SystemNameYearSamplingHighestFrequency Locational RAARangeUnit ofMeasureMCLMCLGMCLViolationTypical SourcesTotal Trihalomethanes (TTHM)2019Monthly24.611.9-33.1ppb80N/ANoByproduct of drinkingwater disinfection.Haloacetic Acids (HAA5s)2019Monthly157.5-22.9ppb60N/ANoByproduct of drinkingwater disinfection.Microbial Contaminants Regulated in the Distribution SystemNameYearSamplingFrequencyTotal Coliform(T. coli)2019DailyMCLMCLGNo more than 5%positive per monthZeroUnit ofMeasurePresent/AbsentHighest MonthlyMCLNumber of PositivesTypical SourcesPercentageViolation0.5% (present T.coli), July 20192 out of 4,524 totalsamples(0.04%); 0 E. colipositive samplesNoNaturallypresent in theenvironment.Disinfectants Sampled in the Distribution System*NameYearResultsDisinfectantas Total Cl22019Lowest period percentageof samples above 0.2 ppm:100%Number of SamplesBelow LevelFrequencyTreatment TechniqueViolation0DailyNoMRDLTypical Sources4.0 ppmDrinking waterdisinfectant used tocontrol microbial growth*Treatment technique requirement: at least 95% of samples per period (month or quarter) must be at least 0.2 ppmLead and Copper Sampled in the Distribution SystemContaminantNamePeriod90thSample Unit of 90th Percentile Sample Sites Above 90th PercentilePercentile Size Measure Action LevelAction LimitAL ExceedanceTypical SourcesCopper1-6/20190.31614ppm1.32NoCorrosion of household plumbing; erosionof natural deposits.Lead1-6/201910614ppb1526NoCorrosion of household plumbing; erosionof natural deposits.Copper7-12/20190.25753ppm1.31NoCorrosion of household plumbing; erosionof natural deposits.Lead7-12/201911.7753ppb1548NoCorrosion of household plumbing; erosionof natural deposits.7 2020 Water Quality Report
TESTING FOR UNREGULATED CONTAMINANTSSince 1996, the EPA, through its Unregulated ContaminantMonitoring Rule, every five years requires water utilities acrossthe country to test for a list of substances that are suspected ofbeing in drinking water but are not currently regulated underthe Safe Drinking Water Act. Utilities report their test results tothe EPA, which uses the information to learn more about thepresence of these substances and decide whether they shouldbe regulated in the future to protect public health.Denver Water’s 2019 test results were reported to the EPA asrequired. Below are the substances that were detected duringDenver Water’s tests and the levels at which they were found.The American Water Works Association has more informationabout the rule and the process on its unregulatedcontaminant-monitoring-rule-ucmr. Informationabout the rule also can be found on the EPA’swebsite at monitoring-rule oryou can contact the Safe Drinking Water Hotline at800-426-4791 or water.epa.gov/drink/contact.cfm.Unregulated Contaminants Monitoring Rule 4AverageRangeUnits ofmeasureDistribution System2.450.75-3.69ppb2019Distribution System1.570.74-2.25ppbChlorodibromoacetic acid (CDBAA)2019Distribution System0.33BRL-0.67ppbTribromoacetic acid (TBAA)2019Distribution SystemBRLBRLppb1-butanol2019Treatment Plant Treated WaterBRLBRLppb2-methoxyethanol2019Treatment Plant Treated WaterBRLBRLppb2-propen-1-ol2019Treatment Plant Treated WaterBRLBRLppba-hexachlorocyclohexane2019Treatment Plant Treated WaterBRLBRLppbButylated hydroxyanisole2019Treatment Plant Treated WaterBRLBRLppbChloropyrifos2019Treatment Plant Treated WaterBRLBRLppbDimenthipin2019Treatment Plant Treated WaterBRLBRLppbEthoprop2019Treatment Plant Treated WaterBRLBRLppbGermanium2019Treatment Plant Treated WaterBRLBRLppbManganese2019Treatment Plant Treated Water4.88BRL-26ppbo-toluidine2019Treatment Plant Treated WaterBRLBRLppbOxyfluorfen2019Treatment Plant Treated WaterBRLBRLppbProfenofos2019Treatment Plant Treated WaterBRLBRLppbQuinoline2019Treatment Plant Treated WaterBRLBRLppbTebuconazole2019Treatment Plant Treated WaterBRLBRLppbTotal permethrin (cis- & trans-)2019Treatment Plant Treated
Total Capacity Chatfield (Denver's portion) Wolford Mountain (Denver's portion) Platte Canyon 910 0.1 Soda Lakes 645 0.1 Total 692,846 100 2 2020 Water Quality Report . lead pipes and plumbing. Denver Water studied multiple treatment options from 2012 to 2017. Based on the results,
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