The URL can be used to link to this page

Home My WebLink About2017-05-25 Board of Health Supplemental Materials North Andover Water Treatment Plant Glen Alt, Superintendent Tiffany Blake, Senior Water Analyst Lake Cochichewick • `'Surface" water source • Length: 2.65 miles • width: Just under 1 of a mile • 7.35 miles of shoreline • Maximum water depth: 45 feet • Average water depth: 23 feet • Holds approximately 4.3 billion gallons of water • Watershed has an area of 21732 acres • Drain from runoff, springs, and brooks to lake • Use 1.1 billion gallons of water every year from the lake for the treatment process, fire protection, and safe drinking water • Average: 3.2 million gallons per day (MGD) • High average in summer months: 6.5-7.0 MGD Untreated Rave Water • Flows by gravityfrom Lake Cochichewick to low lift pump station • Passes through traveling water screen into wetwell �« � y O CL 0 m r+ CD / f I Ozonation Water is pumped from wetwell to ozone contact chamber • Generated on-site • Strong oxidant and disinfectant • Break down organics • Easier to filter Coagulation and Flocculation • The water enters two double-stage rapid mix-basins and the coagulant, Polyaluminum Chloride, is added to form "floc" • Assist in the removal of impurities • Uniformly distributed throughout water by mechanical mixers • Coagulation and flocculation : process where small particles (organics) stick together so that they become large enough to settle out Sedimentation • Flocculated water enters four sedimentation basins Sedimentation • Solids settle to bottom, forming thin layer of solid particles • Large particles settle more rapidly Clarified water, than small particles ith most articles • Settled solids are removed from e moved, on to OPP bottom of basin by moving siphon 40, .0 1- P- iltration step.. I & • Siphon system contains no moving Sludge parts in the water Forms • Does not agitate the solids, providing and is more efficient solids removal lumped Out Carbon Filters F _ , • Water, now clearer of solid farticles, flows into carbon ilters • 8 deep bed granular �� activated carbon (GAG} and sand filters • Removes any remaining impurities • Natural organic compounds • Taste and odor compounds • S nthetic organic c emicalsMI • Toxins Af IT vd-I i i • sed WIN i A • i • ` . i • ` • • ` ti 10151 f Finished Water: Now Safe Drink • Four finished water pumps • Pumping capacity: 12 million gallons per day (MGD) • eater is safe odorless colorless tasteless • Pumped and stored. Two sanitized 2.2 million gallon in-ground storage tanks • One million gallon stand _pipe Forth Andover homes and businesses Massachusetts Certified Operators • Oversee routine operations of our system • Water Quality is constantly monitored by us as well as Massachusetts Department of � � - Environmental Protection u (MassDEP) ®-�— • On-site laboratory what We Monitor • pH • Conductivity • Apparent Color • Manganese • Turbidity • Iron • Nitrate For Finished Water: • Hardness • Bacteria • Calcium • Free Chlorine • Fluoride Equipment: • Ozone • Continuous Free Chlorine, Turbidity, and pH • Zinc Analyzers • Phosphate • Benchtop Spectrophotometer and Turbidimeter • Benchtop pH and Fluoride probes • Incubator • Pocket Colorimeters On-Site Laboratory Lab Bench Water Sample Collection c • 0 i Bacteria Testing • Test to make sure that water is pathogen free using presence/absence method • We test for TOTAL COLIFORMS, which include bacteria found in the soil, water as well as human or animal waste • We test for E.coli (Escherichia coin), a subgroup of fecal coliforms • Most strains are harmless, but some of them will make us sick Heterotrophic Plate Counts * Sample of interest is added to I dehydrated medium that \\ produces a blue fluorescence when metabolized by \ \\ waterborne bacteria • within 45-72 hours y • Number of wells that fluoresce, post incubation, corresponds to a Most Probable Number (MPN) value expressed in CFU/mL • colony-forming units per milliliter 1 � E t � ,; ///, /i�i� / /� ��i/ %/�i��, �� %;�� ,ii ��i �� „ r ,,, � � i�� „„ %�� j�� t ��%/�i /�%%� r' �� iil ,� iii l��/� �i��/,/ %'i��// ;� %/%�i� �� i i/iiia / %�� ;�i�i%� %ii/% �%r /,,�� „��i� ,�,�H1 � ��/��/// i�iii, ', f��r ��/ �� ii/ ��/� ��/,/lir' i ��i/� � � %1,��, ,,;�,,�j�r� i��i�� %�� ;;;'ii1 iii ii%i, /�� ,�il� j%Jl�� , �i;1� %!� � � �x 2016 InflUal Water QUall-ty Report M NORTH ANDOVER WATER DEPARTMENT PWS ID # 3210000 /i /i i NOW Vat North Andover Water is proud to present aur annual water quality report to our residents.This report covers many topics of interest along with the results of tests performed from January 1 to December 31, 2016. We are dedicated to producing drinking water that meets and surpasses all state and federal standards. it is al-- ways our utmost importance that we are delivering the highest quality drinking water to you. As new chal- lenges to drinking water safety emerge, we remain vigilant in meeting the goals of source water protection, + 1 water conservation, and community education while continuing to serve the needs of all our water users. Please share with us your thoughts or concerns about the information in this report. After all,well-informed customers are our best allies. If you would like a printed copy, or if you have any questions or comments regarding our report, please email Glen Alt,Superintendent,at galt@townofnorthandover.com or call at(978)688-9574. • / ''��a c "a: r a r • r• • y i W' a a r. r, • • r a • e t� as r r a na, r a :•, r • w a•, a » qy � r a a a • a rr • • r r , • y • a •r r � • r r s r �• r r 'r • r (d w, rw , In a continued effort to ensure safe drinking water in schools around the Commonwealth, on April 26, 2016, Governor Charlie Baker and State Treasurer Deb Goldberg announced that $2 million from the Massachu- setts Clean Water Trust (MCWT) would fund cooperative efforts to help Massachusetts public schools test for lead and capper in drinking water. The funds, used by the Massachusetts Department of Environmental Protection (MassDEP), were allocated a to provide technical assistance to ensure that public school districts can sample the taps and water f0un- tains in their schools.This was to identify any results that show lead and copper contamination over the action level. Assistant Superintendent Jim Mealey and Superintendent Dr. Jennifer Price sent letters to all parents on October 31, 2016 regarding water testing results in the North Andover Public Schools. Each issue was dealt with in a timely and appropriate manner consistent with the Mass DEP recommendations. More information about the testing assistance for lead in school drinking water is available online at http://www.mass.gov/eea/agencies/massdep/water/drinking/testing-assistance-for-lead-in-school- drinking-water.html PAGE 2 Y • • � • / ,�,,:/ u �/ �n�h��8�i��9rD�y�lOd.�`"l,! �p yr`I mN�1pp B4`,r ff y�f,rl rG77Y e °Ii '9rthlf�l �$p aDjm dfyl a� �Vt m llJ a� • r• 1 • • i D ��(,�://� g{��/i �G{ �7 '! a� 1 f i 1 / � 11� "r` Jj °��m rFl i�1,�1 m.tj • •••1 •^ ."YY • ma ♦ ,xAr lrtl i/f�f ,lri��l ��v�G a .u�'0/�F'�, • • r 1 1 r • r 1 • r r r r •• r • r ♦ • Y m m m m m � m a m roC"Vk • • • � i.. I �r"jl 1'�1 mi 11 IM o I I m B • .1 0 • a s e a a a 0 • r • • • • r • 1 • 1 r' 1 • r rays,andmul h.Us org a ic mui h a • r r • Ys 1 / • • p64 • /Ukong evaporation lake B 8' � WaterReservoir PERMISSIBLE ACTIVITIES Passive Recreation:Walking,Puking, logging,and Biking Fishing: From Shoreline or Boats that are designed to be manually propelled by oars or paddles. Electric motors are acceptable as an alter- nate form of propulsion. Max length of a motorized craft is 15 feet. Must have a valid state license. Boating: Rowing shells,johnboats, rowboats,canoes and kayaks are acceptable as long as the occupants are isolated from contact with the lake.All boating on the lake requires a valid Town of North Andover permit affixed to the outer hull of the boat and to the rear window of the owner's vehicle. Permits shall be exhibited to any officer of the law or authorized employee of the Commonwealth of Massachusetts or the Town of North Andover'. Boats without valid permits are not allowed on the lake. There are two types of permits available for residents of North Andover for recreational use of the lake: 1. Day Boating permit for residents on the lake, but not for overnight boat storage. 2, Combination Boating and Storage permit for residents to boat on the lake and to use overnight public boat storage racks provided by the town at two shoreline locations during the boating season (April 15`h—November V). *DOMESTIC ANIMALS ARE NOT ALLOWED IN CRAFT or ON THE ICE* RESTRICTED ACTIVITIES (All ore fineable offenses). No Littering.All supplies and debris carried in must be carried off. No Swimming, Bathing, or Wading, No Hip Waders shall be worn---fish from shore or boat only. No Windsurfers or Paddleboards• No Gasoline/Diesel powered engines for anything that uses fuel including but not limited to:boats,snowmobiles, ice augers,stoves,and lamps. No dogs or any other domestic animal allowed in the water for any reason. Information on "the Internet The U.S. EPA Office of Water (https://www.epa.gov/aboutepa/about-office-water) and the Centers for Disease Control and Prevention (www.cdc.gov)websites provide a substantial amount of information on many issues relating to water resources,water conservation,and public health. Also, the MassDEP has a website (www.mass.gov/dep) that provides complete and current information on water issues in Massachusetts,including valuable information about our watershed. 20 16 ANNUAL DRINKING 'WATER QUALITY REPORT mOnrm ANDOVER WATER DEPARTMENT PAGE o The North Andover Water Treatment Plant The treatment process consists of a series of physical and chemical steps, beginning with the untreated water being drawn from the lake and � then sent to a tank where ozone gas is added.Ozone, which is generated on-site, is strong oxidant, breaking down organic matter making the water easier tofilter. It also helps remove taste, odor and color and is also o powerful disinfectant. The water then goes to a mixing chamber where a chernicaf called poly-aluminum chloride, a coagulant, is added that aids in making the particles in the water stick together suthat they become so large their own weight causes them to settle out.These processes are called Coagulation, Flocculation and SeJimen' tahon. Thevvaterthetisnowdeorernftheremovedpartic>esthenUowsintotheCarbonFi|teo. NorthAndovcrhoseightcorbmmM|tcouf virgin granular activated carbon along with sand to remove and absorb any remaining impurities.This filtered water is now sent to a holding tank called a Clea/well. In the UeanyoUaovem| chemicals are added such asChlorine asa disinfectant against any bacteria that may still he present and Sodium Hydroxide is also added for pH control adjustment. Fluoride, which is naturally occurring element in trace amounts, is added to our water to adjust the level to improve and maintain oral health in children. We have been adjusting the fluoride level to a safe 0.7 parts per million at this level, is odorless, colorless and tasteless.Aa a final step, Zinc Orthophosphate, a corrosion inhibitor, is added as the water leaves the plant to protect the linings of the distribution system pipes.The water is then pumped through the distribution system Totwo sanitized 22 million gallon in-ground storage tanks and into a one million gallon stand pipe and into your homes and businesses. ��w«�� ,�wl�� Conservation �� ° Only use the garbage disposal when necessary(composting isagreat a|temmtive). ° Repair leaky toilets.Add 12 drops of food coloring into the tank,and if color appears in the bowl one hour later,your toilet is leaking. * Add compost or an organic matter to soil as necessary,to improve soil conditions and water retention. ° When mowing your lawn, set the mower blades to 2-3 inches high. Longer grass shades the soil improving moisture retention, has more leaf surface tn take in sunlight, allowing it to grow thicker and develop a deeper root system. This helps grass survive drought, tolerate insect damage and fend off disease. * Turn off the water tobrush teeth,shave and soap up|nthe shower. Fill the sink tushave. ° Adjust sprinklers so they are not spraying water on paved surfaces such as the sidewalk or driveway. • Sweep outdoor surfaces with o broom instead ofusing a hose. 2016 Sampling Results Water Quality Data During the past year,we have taken hundreds of water samples in order to determine the presence of any radioactive,biological, inorganic, volatile organic or synthetic organic contaminants.The table below shows only those contaminants that were detected in the water.The state requires us to monitor for certain substances less than once per year because the concentrations of these substances do not change frequently. In these cases,the most recent sample data are included,along with the year in which the sample was taken. 2016 Water Quality Data from the North Andover Water Department and Distribution System SUBSTANCE YEAR MCTLGMCL AMOUNT RANGE VIOLATION MAJOR SOURCE (UNIT OF MEASURE) SAMPLED, DETECTED LOW-HIGH REGULATED SUBSTANCES Chlorine(ppm) 2016 4 4 0.65 0.00-1.30 NO Water additive used to control microbes Water additive which promotes strong teeth; Fluoride(ppm) 2016 4 4 0.79 0.44-0.79 NO erosion of natural deposits;discharge from ferti- lizer and aluminum factories Haloacetic acids 2016 N/A 60 6.1 2.0-8.8 NO Byproduct of drinking water disinfection [HAA](ppb) Nitrate(ppm) 2016 10 10 <1.0 N/A NO Runoff from fertilizer use; Leaching from septic TTHMs[Total 2016 N/A 80 24.5 8.7-33 NO Byproduct of drinking water disinfection Trihalomethanes](ppb) Total Organic 2016 N/A TT 53 44-60 NO Naturally present in the environment Carbon(%removal) Turbidity'(NTLI) 2016 N/A TT 0.97 0.04-0.97 NO Soil runoff Turbidity(Lowest monthly 2016 N/A TT 100% N/A NO Soil runoff %of samples meeting limit) 'Turbidityls a measure of the cloudiness of the ivater.Itis monitored beeiiisciti,,;agood indicator oi'dieeffectiveness ofthe filtration system AMOUNT SITES SUBSTANCE YEAR AL MCLG DETECTED ABOVE AL/VIOLATION MAJOR SOURCE (UNIT OF MEASURE) SAMPLED (90th%tile) TOTAL SITES Copper'(ppm) 2014 1.3 1.3 0.16 0/30 NO Corrosion of household plumbing systems; Erosion of natural deposits Lead'(ppm) 2014 0.015 0 0.002 0/30 NO Corrosion of household plumbing systems; Erosion of natural deposits 2Tbe town is onlyrequited to test forkad and copper every three yeats due to the non-existent and extremely low levels found at our tops. Tap water samples were collect- eel for lead and copper analysis throughout the cotrimunity.Samples are scheduled to be collected the summer ofM7. Averawes of Common Parameters: pH: 7.32 Sodium: 40 ppm Iron: 0.01 ppm o Manganese: 0.01 ppm Bacteria: Negative Hardness: 35-42 plarn = 2.0-2.5 grains/gallon (North Andover has soft water) 0& ��~~�� N��0��K�onS ° 9[thPercentile:out ofevery 1Ohomes sampled,9were atorbelow this level, ° AL(Action Level):The concentration of a contaminant which, if exceeded,triggers treatment or other requirements ° which awater system must follow. ° MCL(Maximum Contaminant Level):The highest level of a contaminant that is allowed in drinking water, MCLs are set as close to the N1CLGuusfeasible using the best available treatment technology. ° MCLG (Maximum Contaminant Level Goal): The level of a contaminant in drinking water below which there is no known or expected risk tohealth. MCb3sallow for amargin ufsafety. ° K4RDL (Maximum Residual Disinfectant Level): The highest level of disinfectant allowed in drinking water.Them is convincing evi- clence that addition of a disinfectant is necessary for control of microbial contaminants. w oxRDLG (Maximum Residual Disinfectant Leve) Goal): The level of drinking water disinfectant below which there is no known or expected risk tohealth.MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants. " N4: Not available. " NTU (Nephelometric Turbidity Units): Measurement of the clarity, or turbidity, of water. Turbidity in excess of 5 NTU is just no- dceab/etothe average person. ° ppb(parts per biUion): One part substance per billion parts water(or micrograms per|iter). ° ppm(parts per million):One part substance per million parts water(or milligrams per liter). ° TT(Treatment Technique):A required process intended to reduce the level of a contaminant in drinking water. � .� � �� Plumbing NL��N 0�� 0�� '��V�� ~.��m�~~ p�� mom�� ~��w�~~*m�� How Does Lead Get Into [WyWater? Lead enters the water("leaches")through contact with the plumbing. Lead leaches into water through: Corrosion of: • Pipes w Solder • Fixtures and Faucets(brass) w Fittings The amount of lead in your water also depends on the types and amounts of minerals in,the water, how long the water stays in the pipes, the amount ofwear inthe pipes,the water's acidity and its temperature. If present, elevated |ev*|o of lead can cause serious health problems, especially for pregnant women and young children. Lead in drinking water is primarily from materials and components associated with service lines and home plumbing.We are responsible for providing high -quality drinking water but cannot control the variety of materials used in plumbing components. When your water has been sitting for several hours, you can minimize the potential for lead exposure byflushing your tap for 3O seconds to 2 minutes bchzrc using water for drinking or cooking. if you are concerned about lead in your water, you may wish to have your water tested. Information on lead in drinking water, testing methods and steps you can take to minimize exposure isavailable from the Safe Drinking Water Hotline or at xxovm/.epa.gov/smfexxater/|ead. Rn/mmdebu0s with 0rNvalel Wells, For a small fee, the North Andover Water Treatment Plant (VVTP) lab is certified to conduct bacterial tests, including tests for E. coli, on your water. Sample bottles and instructions can be obtained from the water treatment plant at 420 Great Pond Road. If you would like to And a private lab that is certified for different parameters, you can find them on the state's Web site: http://pub|ic.6ep.ytate.mo.us/Lahoert/Loboert.aopx. All questions relating to wells should be directed to the health department at(978)688-9S40. Y�� Answers?p� We encourage you to share your thoughts with us on the information contained in this report.Should you ever have any questions about this report or relating to your drinking water please call the water treatment plant at (878) 688-9574, If you have questions regarding your water bills, please call the DPW at(978)@A6-8950. PAGE 6 Important Health fiW ation Some people may more vulnerable to contaminants in drinking water than the general)population, Immunocompromised persons such as parsons wniith cancer undergoing Chemotherapy, ,persons who have undergone organ,transplants, people with HIV/AIDS or other immune system disorders, some elderly and infants may be particularly at tisk from infections.These people should seek advice about drinking water frog their health care providers, The U.S! EPA/CDC (Centers for Disease Control and Prevention)guidelines on appropriate means to lessen the risk of infection by Cryptosporidium and oother microbial contaminants are r ttp;//w�rater etaae,gov/drink�hritlineabMe from the Safe Drinking Water Hotline a (800)426-4791 df Substances Could n Our Source Water l To ensure that tap water is safe to drinkf the Departmentartment ofEnvir Environmental Protection DEP and the U.S. Environmental Protection AgencyU.S. EPA) prescribe regulations limiting the amount of certain contaminants in water provided by public w f• �•0" ` t water systems. Food and Drug Administration (EDA) and Massachusetts Department t of Public Health (DPM) regulations establish limits for contaminants in bottled water, ' � "t ,l which must provide the same protection for public health. Drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of these contaminants does not necessarily indicate L3, that the water poses a health risk. t The sources of drinking water(both tap water and bottled water) include rivers, lakes, t 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 rit i cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activity.Substances t l that may be present in source water include: t a Microbial Contaminants, such as viruses and bacteria,which may come �I I from sewage treatment plants, septic systems, agricultural livestock opera- tions or wildlife; i b a Inorganic Contaminants, such as salts and metals,which can be naturally t occurring or may result from urban storm water runoff, industrial or domes- tic wastewater discharges,oil and gas production, mining or farming; t a Pesticides and Herbicides, which may come from a variety of sources, f l such as agriculture, urban storm water runoff and residential uses; ) a Organic Chemical Contaminants, including synthetic and volatile organic l r; chemicals, which are by-products of industrial processes and petroleum pro- duction and which may also come from gas stations, urban storm water run- off and septic systems; ` a Radioactive Contaminants, which can be naturally occurring or may be l l the result of oil and gas production and mining activities, t Il ( More information about contaminants and potential health effects can be obtained by calling the U.S.EPA's Safe Drinking Water Hotline at(800)426-4791. ,!!h 2016 ANNUAL L7RINKIiVG WATER QUALITY REPORT NORTH ANDOVER wvATsn DepuxTmEmT pxGs r � ~� ��C~�� ~� l� THINK UUP � ��0�� Waste � �� Quality �� r �u mmam � DOG POOP~� @ � Animal waste is one of the many sources of pollution that can add up to big problems for water quality UUNPU � and � may cause health problems as well.Animal waste contains several types of pollutants that contribute to water quality problems: nutrients, ammonia, pathogens and naturally toxic material. When anima[ TRY DRINKING IT. � � waste ends up|n a pond,stream, ormore importantly Lake Cnchich*wick, it decomposes, using LIP oxygen Petmwmewashes into � and releasing it pollutants into the water. During summer months when the water is warm, the our storm drains and Pm8mtes combination of low oxygen levels and ammonia cankill fish and other aquatic organisms. The nutrients our streams. � �i cause excessive growth of aquatic weeds and algae. � i Pathogens, the disease causing bacteria and viruses associated with animal waste, can also make water � unsafe for human use. If pathogens or the indicator bacteria associated with animal waste are found � during water testing, Stevens Pond may be closed to swimming. Lake Coohichewick may also require � expensive means to remedy the issue. � Fortunately, there are some simple dj that everyone can do to help t pollution by keeping Jf, animal waste out of the water. While it may seem easier to ignore the problem of animal waste, � remember that you are protecting not only the environment but also your own health. � 07W��w0�K� � ~~��N ��7�� W�� &M�i� ��7��0� 0 � 8��a�� m�m�� "�� n�� v�� ~' � 1Pickmpa�eryourpet Pmven�n�waterpoUu�pn�sassimp|easrememheringtohringa|un�ap|as�cba�vvhenyouvvo|kyourdo� � . . � � Oispnseufthe waste inatrash receptacle, Bagging the waste and leaving itdoes not constitute a`cleaning upafter your pet. 2 Don't feed waterfowl. VVhi|o one of pleasures of trip to Stevens Pond or Lake Coch|vhc�idk has always been taking stale � ' ' W bread to feed the waterfowl,the environmental and health impacts of this activity for both humans and birds can be serious. While � ducks,geese,and swans all love bread, it lacks the nutrients and roughage of their natural diet. Feeding these birds bread is similar to N feeding asmall child adiet ofcandy and soda;they may love i� but itdoes them nogood and may cause long-term health problems � . � Feeding waterfowl also tends to cause the birds to gather |n numbers higher can be supported by natural food supplies' �1 These large flocks of birds also create large quantities of waste and serious water pollution problems. � 0/0 �� 0L�� b� ��c" ��vmmm�nn��m�� w�� mp vrcp What ima cross connection? A cross connection is any actual or potential connection between the drinking water lines and potential sources of pollution or contamination such as a piping arrangement or equipment that al- lows the drinking ||owsihmdrinking water to come in contact with non-potable liquids, solids, or gases hazardous to humans inevent ofabackflow. What isabackfilmxv7 Backflow is the undesired reverse of the water flow in the drinking water distribution lines. This backward flow of the water can occur when the pressure created by equipment or system such as a boiler orair conditioning system ishigher than the water pressure inside the water distribution line (back pressure),or when the pressure in the distribution lines drops due to routine occurrences such as water main breaks or heavy water demand causing the water to flow backward inside the water distribution system (backsiphona0e). Backflow is a problem that many vvmtor cunoumoo are unaware of,pproblem that each and every water customer has o responsibility tohelp prevent. Simple steps to prevent cross connection hazards: * Never submerge a watering hose into a pool, tubs, sink, bucket nfsoapy water, pet watering containers,drains,orchemicals. * Always leave anair gap between the hose and the object you are filling, • Install a hose bib vacuum breaker on everythmated water fixture. These can be found at most hardware stores and are easy to install. For more information,review the Cross-connection Control Manual from the U.S.EPA's Web site at: http://oxater.epa.gqv/nfrastructure/ddnk|ngwater/pm/s/crosoconnecduncuntru|/index.cfm You can also call the Safe Drinking Water Hotline et(Q00)42G-4791. PAGE 8 — «. — lil IY I I Water pollution degrades surface waters making them unsafe for drinking,fishing, swimming,and other activities. As authorized by the Clean Water Act, the National Pollutant Discharge Elimination System (NPDES) permit program controls water pollution by regulating "point sources"that discharge pollutants � into waters of the United States. Point sources are often discrete conveyances such as pipes or man-made ditches or drains(catch basins) that direct "stormwater" to a surface source. Stormwater runoff is generated when precipitation from rain and snowmelt events flows over land or impervious surfaces (paved streets, parking lots, and build- ing rooftops), and does not percolate into the ground.As the runoff flows over the land and impervious surfaces it accumulates debris,chemicals, sediment or other pollutants that could adversely affect water quality if the runoff is discharged untreated into our lake or tributaries. Federal and state laws and regulations require municipalities with a storm drain system to manage and control all stormwater discharges in their towns and they, along with everyone who wants to discharge ' any type of water with pollutants, must first obtain an NPDES permit to do so. If you see a suspicious discharge to a body of water or storm drain (catch basin, slotted manhole, etc.), r please contact North Andover's Conservation Commission at(978)688-9530, L.. J, lips. ' 1. Don't dump anything into storm drains. Dispose of hazardous waste through North Andover's ongoing waste oil collection program and bi-annual hazardous waste collection days. 2, When watering your lawn, don't over water. Water that runs off sidewalks and roadways carries f��ir %/ ✓/ /j contaminants(oil,grease,and metals)into our storm drain system. 3. Divert runoff from pavement to grassy,planted,or wooded areas of your property. NsWH �a 4. Reduce fertilizer and pesticide use, S. Sweep up salt and sand on your walkways after snowmelt. Don't hose dawn driveways or sidewalks. 6. Inspect your vehicles and equipment for leaking and damaged parts. Source. Wate. AsseSsment Plan In 2004,the Department of Environmental Protection (DEP) completed an assessment of all the water (l supplies in Massachusetts, Out of this assessment, they created a plan for each community called a dfV i /ate r sourc / y p� �� SWAP The purpose a this SWAP was to determine the susceptibility r ssment P an /1 � /��moa'i el)iol se� 1�*,q i ; i pr()sptt}t tori' ,t ;if ootlrsejn 1 that these potential to become watershed, Protecting our watershed Is our first line of defense l in protecting our drinking water. The complete SWAP report is available online at http://; www,northandoverma.gov/Pages/NAndoverMA-_OPW/wtp/index-- "Lake &Watershed Information," For more information, please contact Glen Alt at(978)688-9574. - — — — - i 2016 ANNUAL. DRINKING WATER QUALITY REPORT