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" '" ~ "'" - ...::. ~ ; ('... ~ ~ -::::r: ~a-r.::.~('. ~~~r::-~ ~~~~~ '1~~ .>J. ..!)"'>- VI, r.::.. ~.::o.~~~ ':::C~=:.;t ~ .. .J <$~ .:) -~ ',t;; ..t; c3"j ~ ~ ........ ~ ~ . ~ <t: \~ ~ ..:: ~ ~ --' ":X: t;~~ , " r: ~ ~ ~ ~~ ""::)- ... .. .. ... ~ ~ ciJ - ~ ,..) ..... -::: cQ - .;= ~"?: ~'" Q.. ~ ~~ ~ ~ "'" "1 ~ ':Z:. ""'" = :=-:: "'-4 ~ A , ~ -- C"I\ ...::: ...:: -J ..s -7 -; ~ q ~ ... N N ..::: Cl ~ ~ :is ~ "'" :p ~ ::l <-, N '1 ....::. ~ c( \D '? .... .... Ln <:> <:> N 0;- ;::;;- ..... \'li \~~: ~\ >J I~~ ~ c .... , ,. .~ -I City of Prior Lake 4646 Dakota St. SE Prior Lake, MN 55372-1714 Bulk Rate U.S. POSTAGE PAID Prior Lake, MN Permit No. 33 Presorted Standard U.S. Postage I I I I I I I I I I I I I I I I I I I I I I Prior Lake Water is Groundwater All water delivered to residents is groundwater. The City operates five wells, ranging in depth from 345 to 640 feet deep. Four of these wells draw water from the Jordan Sandstone Aquifer. The fifth well taps into the Franconia-lronton-Galesville aquifer, another sandstone formation that can produce high-capacity wells. The Minnesota Department of Health has determined that one or more sources of your drinking water is potentially susceptible to contamination. If you wish to obtain the entire source water assessment regarding your drinking water, please call 651-201-4670 during normal business hours. Also, you can view it online at w\vw.health.state.mn.us/ divs/ eh/water / swp/ swa. Remember Remember to keep the radio transmitter in your home (a gray box about 4" square, located near the water meter) accessible and free of obstructions. If the receiver is unable to detect a signal, City staff will have to visit your home and correct the problem. Water Conservation Over-depletion of our water supply resources is a real threat. Remember that the City of Prior Lake observes an odd/even sprinkling restriction, in conjunction with an 11:00 a.m. to 5:00 p.m. daily ban effective May I through September I. You can save water and have a green lawn by following ;1 few wise-use water tips: If your ,grasS springs back when you step .on it, if doesl1 ~ need watering. If it roins an inch or /1IOre, wait at least jive days to 11Jt1/er' tJI!Ilin. J Use a sprinkler that Jelivers large drops, rather /h(z11 a.fine mist. Mow yollr grass to a length fJj 2 to 3'~ aM let the clippings lie on the ground. This shades the soil to prevent evaporation. Sod Watering Permits New sod watering permits are available at the maintenance center at 17073 Adelmann St. SE. or bv contacting rhe maintenance center at 952-440-9675. The permits are only available if you have installed new sod, seeding or landscaping and must be inspected by maintenance personnel prior to being allowed. This permit is only good for thirty days which allows watering everyday excluding the hours of I lam to 5pm. What You Need to Know about Drinking Water Regulations In order to ensure that tap \vater is safe to drink, the Environmental Protection Agency (EPA) prescribes regulations that limit the amount of certain contaminants in water provided bv public water systems. Food and Drug Administration regulations establish limits for contaminants in bottled water that must provide the same protection for public health. The Laboratory Tests Your water is thoroughly tested as it is pumped from the ground and from locations throughout the city. Contaminants that may be present in source water are divided into five basic testing categories: Microbial &Ontaminants, such as viruses and bacteria, which may come from sewage treatment plams, septic systems, agricultural operations, and wildlife. IfIOfl,anic contaminants, such as salts and metals, which can occur naturally or come from urban srormwater runoff, industrial or domestic wastewater discharges, oil and gas production, mining, or farming. Pestitides and herVidtJeJ, which may come from agriculture, urban stormwater runoff, and residential uses. Organic chemical contaminants, including synthetic and volatile organic chemicals, which are industrial and petroleum process byproducts and can also come from gas stations, urban stormwater runoff, and sepoc systems. Radioadive &ontaminants, which can occur naturally or result from oil and gas production and mining. Some PfOple TlIIl)' bf mO/"f I'IIlllerable to rontalllinant.'.fiilll1d in dlinkin}!, mder tball tbe J!.fI1eral populatioll. bmlllfl/o-rompro/lliJrd pfrJOII.~ slIrb as per SOli.' lI'itb ralleer ,,,,de1l,oil1,!', rhe!1lotherapy, persollJ II'ho have IIlIderp,om or;f,all tlt1llsplalltJ, people Ibitb HII '/ AIVS or other imlllllllt J)'.'te1l1 disorders, JO/lli' rldnfy, and if!fants, Regulated substances havcl'vlaximum (an be parlimlillfy at riskji"om illfectiollJ. ThfJe Contaminant Len:ls (MCLs) set by the EPA. people Jbould Jffk ad,)i,,' abollt drillking fi'l1ter This is the highest level of the subsrance jiY!lll their lif'lltb rare prolidn"S. EPA/ Cmters }or legally alkmocd in drinking wa:er. Some contaminants also have MCL goals 'v' C I' JI: . (MCLGs). Th]s ]s the level ot a substance below whIch there ]5 no kn<Ywn IJeaJr ontro f,fIllKlIlles Oil appropnate !1lf{/lIJ to . ."., . . ': . . C . . ot expected health mk. 1\ICL('5 allow tor a margm ot safetv. l'\ICLs are set leHfI1 thf mk oj lI7fertlOlI br JjptospondlUm alld I ., -.' . . . . '. _, . as c nse to MCL(,s as feas]ble USing the best aVallable water tre'ltment otherlllllTobzal ron/ammant.f {till be obtained br processes. MRDL: Maximum Residual Disinfectant Level MRDLG: {tIllillp' /hf EPAs Safe Vlillkjn,g Wahl' Hotlille J\bximum Residual DisinfecL1nt Level Goal. (800426-4791). Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. l\-Iore information about contaminants and potential health effects can be obtained by calling the EPNs Safe Drinking \'Vater Bodine (800-426-4791). Contaminant Information from EPA Arsenic W'hile your drinking water meets the EPA's standards for arsenic, it does contain low levels of arsenic. The EPA's standard balances the current understanding of arsenic's possible health effects against the cost of removing arsenic from drinking water. The EPA continues to research the health effects of low levels of arsenic, which is a mineral known to cause cancer in humans at high concentrations and is linked to other health effects such as skin damage and circulatory problems. Source Water Testing The sources of drinking water (both tap water and botded 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 cases, radioactive material, and can pick up substances resulting from the presence of animals or humans. \'('ater from the wells is thoroughly tested for contaminants like these, and lab test results for Prior Lake water are listed on the table to the right. Prior Lake Drinking Water Found Safe in 2006 Before the City of Prior Lake delivers water to your home, it is thoroughly tested in certified laboratories that can detect trace amounts of contaminants. Prior Lake test results for last year are shown in the table at right. No contaminants were detected that exceeded 2006 EPA limits in drinking water. EPA regulates substances that are potentially harmful to human health and have a reasonable possibility of being found in drinking water. Tests for some of these substances are as frequent as weekly, quarterly, or annually. The levels of some things however, change little over time, or the chances of detecting them is low. These are monitored less than annually. Substances that have been found in previous years' testing are also listed in the table, along with the year that thev were found. Definition of Terms in the Table The Level Found can be the highest amount found or the average of ,)11 samples analyzed, depending on the regulation for the p'lrricular substance. No contamillal11S were detected at levels that exceed limits for safe drinking water Unregulated substances do not have MCl.s. They are assessed by state standards known as health risk limits. If ,111 unaccepmble amount of any substance is e\'(,1' found in our water, the City of Prior Lake will notify residents immediately and take corrective action to eliminate the problem. Monitoring for unregulated contaminants as required bv U.S. Em'ironmental Protection Agency ,vas conducted in 2004. Results of the unregulated contaminant monitoring are avaihlble upon request from Cindy Swanson, J\.linnesota Department of Health, at 651-201-4656. The Action Level (AL) is the MCL for lead and copper. If 90":0 percent of all s,unples tested are not below the action level concentration, then the water utility is required to perform trearment processes th'1I will help decrease pipe corrosion. Radon Radon is a radioactive gas which is naturally occurring in some groundwater. It poses a lung cancer risk when gas is released from water into air (as occurs during showering, bathing, or washing dishes or clothes) and a stomach cancer risk when it is ingested. Because radon in indoor air poses a much greater health risk than radon in drinking water, EPA is assessing two limits for drinking water. One limit is an Alternative Maximum Contaminant Level (AMCL) of 40()() pCi/L. It will apply to states that have adopted an Indoor Air Progran1, which compels citizens, homeowners, schools and communities to reduce the radon threat from indoor air. The second limit, which will apply to states without an indoor air program, may be set at 300 pCi/L. Minnesota plans to adopt an Indoor Air Program once the Radon Rule is finalized. ~~~rul~1t~ @1f l@)~@[J@)1(@nJ T~~1t~[fi)~ City of Prior Lake Drinking Water January 1 to December 31, 2006 Units of Measurement Key: ppm: parts per million. or milligrams per liter ppb: parts per billion, or micrograms per liter pCi/L: picoCurics pcr liter, a measure of radioactivity ND: Not Detected Detected Substance(units) MCL (highest level allowed ill water by EPA) MCLG (level where there is no klloli'lI health ri.~k) Fluoride (ppm) MCL: 4.0; MCLG: 4.0 Lead (ppb) AL: 15 (90% oj"samples tested ml/st he < 15 pph) Copper (ppm) AL: 1.3 (90% o.f samples tested must be <1.3 ppm) Sodium (ppm) No established EPA limits Results for Prior Lake Tap Water Level Range of Found Detections 1.08 0.89-1.0 90% of lout of 30 samples< 7.0 samples test- ed > 15 ppb 90% of o out of 30 samples samples test- <0.67 ed> 1.3 ppm 6.1 19 719 3.9 7.2 0.37 0.29 1.1 0.82 Highest 0.25-1.3 Quarterly Avg Monthly Avg. 7.61 Typical Source of Substance in Drinking Water * Annual monitoring is n01 required for all sub~ stances. For this reason, results in the- table are for when the substance was last analyzed and detecled, which may have been prior to 2006. Additive for strong teeth; erosion of natural deposits; fertilizer and aluminum factories. Corrosion of household plumbing systems; erosion of natural deposits. *Test Date 2006 2004 2004 Corrosion of household plumbing systems; erosion of natural deposits. 2004 Erosion of natural deposits. 2004 Erosion of natural deposits. Sulfate (ppm) No established EPA limits Radon (pCi/L) Limit not yet estahlished 2005 Erosion of natural deposits. 2003 Erosion of natural deposits. Alpha Emitters (pC ilL) MCL: 15.4; MCLG: 0 Total Trihalomethanes (ppb) MCL SO: MCLG 0 Barium (ppm) MCL: 2.0; MCLG: 2.0 Combined Radium (pCi'll MCL: 5.4: lHCLG:O Haloacetic Acid (HAAS) (ppb) MCL:60; MCLG:O Chlorine (ppm) MRDL: 4.0; MRDLG: 4.0 Arsenic (ppb) MCL:50; MCLG: 0 2006 By-product of drinking water disinfeetion. 2005 Discharge of drilling wastes, metal refineries and erosion of natural deposits. Erosion of natural deposits. 2003 2006 By-product of drinking water disinfection. Water additive used to control microbes. 2006 2005 Erosion of natural deposits; Runoff from orchards, glass and electronics production wastes.