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Home My WebLink About7, 2019 Public Health Goals Report Public Hearing #72019 Public Health Goals Report2019 Public Health Goals Report June 5, 2019 2019 Public Health Goals Report reduce exposures below the PHGtheir potential health effects, and estimated costs to contaminants, The PHG report must also include information regarding the •exceeded during the previous monitoring periodestablished, and have been already been Health Goals (PHG) have for which Public contaminants The report is to outline water quality •provide a Public Health Goals Report every three yearswater systems with greater than 10,000 service connections to California Health and Safety Code, Section 114670(b) requires public •BACKGROUND / HISTORY 2019 Public Health Goals Report 2019 Public Health Goals Report meeting in October, 2016at a regularly scheduled board PHG report was presented at a public hearing held 2016 The District’s •comment through the public hearing processmust provide an opportunity for service area customers to review and Following the completion of the PHG report, public water systems •BACKGROUND / HISTORY 2019 Public Health Goals Report NEW INFORMATION presented for public comment at the Board’s directionof the report to be presentation for review Staff has prepared a •A copy of the PHG report has been included with the staff report•submitted to the California State Water Resources Control Board Public Health Goals report has been prepared and 2019 The District’s •2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing PHG are not enforceable and are strictly intended to be health goals•technologies, or costfactors such as analytical detection capabilities, available treatment When establishing PHG standards, the OEHHA does not consider •solely on public health risk considerationsEnvironmental Health Hazard Assessment (OEHHA) and are based Public Health Goals (PHG) are set by the California Office of •2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing and the SWRCBpublished by the Association of California Water Agencies (ACWA) For the purposes of preparing the report, staff used guidelines •consideredwere 2018 and 2016 from the potable water system between PHG report, all water quality data collected 2019 For the District’s •2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing physical and chemical properties of the aquiferThe mobility of arsenic in groundwater is highly dependent upon the •and accumulation through weathering.The element is commonly found in sedimentary soils due to migration •a variety of solid phases including volcanic rock.metal element naturally occurring in the earth’s crust, found in -A semi•Arsenic 2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing 4.0ppbNorthside Well•8.8ppbSanders Well•2.5ppbProsser Village Well•4.9ppb•9.8ppbAirport Well•9.9ppbMartis Valley Well •9.4ppbGlenshire Drive Well •above the PHG limit of .004 ppbwells the 12 groundwater 7of The District has detected arsenic in •ppbparts per billion (ppb) and the PHG is .004 SWRCB Maximum Contaminant Level (MCL) for arsenic is 10 The •Arsenic (continued)2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing)6-case per million (1x10cancer risk from a lifetime of exposure at the PHG (.004ppb) of one OEHHA reports arsenic to have an upper bound estimate of excess •10ppbIn 2008 the California MCL for arsenic was revised from 50ppb to •in the liver, bladder, kidney, lungs and skinArsenic is a known carcinogen, reported to increase risk of cancer •Health Effect Information•Arsenic (continued)2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing per customer550 approximately $This would result in an assumed annual estimated operating cost of •estimated annual O&M6.8M initial construction, with an additional $$7.95M for wells where arsenic has been detected is approximately 7 The estimated cost to install treatment systems of this nature at all •utilized in efforts to reduce arsenic levels in potable water sourcesFixed bed adsorption systems are a filtration technology commonly •)(BATTechnology Best Available 2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing(LCR)years in accordance with the Federal EPA Lead and Copper Rule The District conducts sampling for lead in drinking water every three •of 2.0ppb established in 1997The current PHG was revised in 2009, lowered from the previous PHG •0.2 ppband the PHG is 15ppb is lead SWRCB Maximum Contaminant Level (MCL) for The •Lead 2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing percentile level of 3.0ppb th Results indicated a 90•in 2016The District’s last round of LCR monitoring samples were conducted •levelpercentile concentration th is based upon a 90Compliance •water at all public school system campuses by July 1, 2019AB 746 requires public water systems to test for lead in drinking -CA•tapsresidential Sampling includes “first draw” water collection from customer owned •ontinued)cLead (2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing cost of mitigation is a reasonable expectationFurther study would be required to determine if an accurate estimated •below the action level but exceed the PHG (0.2ppb)No clear BAT for systems in which the lead concentration levels are •control”action level of lead concentrations (15ppb) is “optimized corrosion percentile for the th BAT for drinking water system exceeding the 90•Best Available Technology (BAT)2019 Public Health Goals Report2019 Public Health Goals Report Public Hearing recommended at this timefurther action is the significant costs associated with testing and implementation, no levels in water already below the MCL, and reducing Based on the uncertainty of available treatment technologies in •extensive range of costly testing and construction would be requiredhealth based MCLs established by the SWRCB and USEPA, an levels, that currently meet the contaminant In order to further reduce •meets or exceeds all SWRCB and USEPA standardsDrinking water quality for the Truckee Donner Public Utility District •ActionRecommendation for Further 2019 Public Health Goals Report2019 Public Health Goals Report FISCAL IMPACT There is no direct fiscal impact associated with this item•2019 Public Health Goals Report2019 Public Health Goals Report RECOMMENDATION Direct staff to file this report•Hold a public hearing and receive comment•2019 Public Health Goals Report2019 Public Health Goals Report