Water Quality Testing Summary

WATER QUALITY TESTING SUMMARY A DETAILED REVIEW OF THE TEST RESULTS FOR THE DRINKING WATER PRODUCED BY THE CARY/APEX WATER TREATMENT FACILITY 2020 JOHN CONLEY (Senior Laboratory Analyst) has been employed by the Town of Cary at the Cary/Apex Water Treatment Facility Laboratory since September 2001. CARY/APEX WATER TREATMENT FACILITY 2020 WATER QUALITY TESTING SUMMARY We are pleased to present to you the Cary/ If you have any questions or concerns regarding this report, please contact Rachel Monschein, Water System Laboratory Supervisor, at (919) 362-5507. <ul style="display: flex;"><li style="flex:1">Apex Water </li><li style="flex:1">Treatment </li><li style="flex:1">Facility </li><li style="flex:1">Test </li><li style="flex:1">Result </li></ul>Summary for 2020. This report is a snapshot of last year’s water quality. The values contained in this report are based on single measurements or yearly averages depending on the contaminant. The Environmental Protection Agency and/or the State requires us to monitor for certain substances less than once per year because the concentrations of these substances are not expected to vary significantly from year to year. Some of the data, though representative of the water quality, is more than one year old. In these cases, the most recent data is included, along with the year in which the sample was taken. It is our constant goal to provide you with a safe and dependable supply of drinking water. In order to ensure that tap water is safe to drink, EPA prescribes regulations that limit the amount of certain contaminants in water provided by public water systems. 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 the water poses a health risk. To obtain more information about contaminants and potential health effects, call the EPA’s Safe Drinking Water Hotline at (800) 426-4791. 2CARY/APEX WATER TREATMENT FACILITY 2020 WATER QUALITY TESTING SUMMARY IMPORTANT DRINKING WATER DEFINITIONS: Action Level (AL) Locational Running Annual Average (LRAA) The concentration of a contaminant that, if exceeded, triggers treatment or other requirements which a water system must follow. The average of sample analytical results for samples taken at a particular monitoring location during the previous four calendar quarters under the Stage 2 Disinfectants and Disinfection Byproducts Rule. Amount Detected The annual average value, not the maximum value, for the parameter listed. EPA requires that maximum amounts detected be reported in the Annual Water Quality Report (CCR). Microsiemens per centimeter (µS/cm) A measure of the conductivity of water. Million Fibers per Liter (MF/L) Maximum Contaminant Level (MCL) A measure of the presence of asbestos fibers that are longer than 10 micrometers. The highest level of a contaminant that is allowed in drinking water. MCLs are set as close to the MCLGs as feasible using the best available treatment technology. Nephelometric Turbidity Unit (NTU) A measure of the clarity or turbidity of water. Note: MCLs are set at very stringent levels. To understand the possible health effects described for many regulated constituents, a person would have to drink two liters of water every day at the MCL level for a lifetime to have a one-in-a-million chance of having the described health effect. Not Applicable (N/A) Information not applicable or not required. Non-Detects (ND) The contaminant is not present at the level of detection set for the particular method used. Maximum Contaminant Level Goal (MCLG) The level of a contaminant in drinking water below which there is no known or expected risk to health. MCLGs allow for a margin of safety. Parts Per Billion (ppb) or Micrograms Per Liter (µg/L) One part substance per billion parts water. Parts Per Million (ppm) or Milligrams Per Liter (mg/L) Maximum Residual Disinfection Level (MRDL) The highest level of a disinfectant allowed in drinking water. There is convincing evidence that addition of a disinfectant is necessary for control of microbial contaminants. One part substance per million parts water. Parts Per Trillion (ppt) or Nanograms Per Liter (nanograms/L) One part substance per trillion parts water. Maximum Residual Disinfection Level Goal (MRDLG) Picocuries Per Liter (pCi/L) The level of a drinking water disinfectant below which there is no known or expected risk to health. MRDLGs do not reflect the benefits of the use of disinfectants to control microbial contaminants. A measure of the radioactivity in water. Running Annual Average (RAA) Compliance calculations based on a running annual average of reported values. Method Reporting Limit (MRL) The lowest reportable concentration set for the particular method used. Standard Units (SU) A measure of the pH of water. Treatment Technique (TT) A treatment technique is a required process intended to reduce the level of a contaminant in drinking water. 3CARY/APEX WATER TREATMENT FACILITY 2020 WATER QUALITY TESTING SUMMARY LEAD AND COPPER SITES ABOVE AL/TOTAL SITES CONTAMINANT (UNITS) <ul style="display: flex;"><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li></ul>ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) <ul style="display: flex;"><li style="flex:1">AMOUNT </li><li style="flex:1">VIOLATION </li></ul>Y/N TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">SAMPLED FREQUENCY </li><li style="flex:1">DETECTED </li></ul>Corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives Copper (ppm) AL = 1.3 AL = 15 1.3 0<ul style="display: flex;"><li style="flex:1">0.121 </li><li style="flex:1">0/60 </li></ul>0/60 60 samples once every 3 years (90th percentile) <ul style="display: flex;"><li style="flex:1">2018 </li><li style="flex:1">N</li></ul>Lead (ppb) (90th percentile) Corrosion of household plumbing systems, erosion of natural deposits <0.003 NITRATE AND NITRITE <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li></ul>ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) <ul style="display: flex;"><li style="flex:1">AMOUNT </li><li style="flex:1">RANGE </li><li style="flex:1">VIOLATION </li></ul>Y/N TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED FREQUENCY </li><li style="flex:1">DETECTED DETECTED </li></ul>Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits Nitrate (as Nitrogen) (ppm) 10 1 10 1 <1 2 times 2020 <ul style="display: flex;"><li style="flex:1">N/A </li><li style="flex:1">N</li></ul>a week Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits Nitrite (as Nitrogen) (ppm) <0.01 ASBESTOS <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li></ul>ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) <ul style="display: flex;"><li style="flex:1">AMOUNT </li><li style="flex:1">RANGE </li><li style="flex:1">VIOLATION </li></ul>Y/N TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED FREQUENCY </li><li style="flex:1">DETECTED </li><li style="flex:1">DETECTED </li></ul>Once every 2020 Decay of asbestos cement water mains; erosion of natural deposits <ul style="display: flex;"><li style="flex:1">Total Asbestos (MF/L) </li><li style="flex:1">7</li><li style="flex:1">7</li><li style="flex:1">< 0.19 </li><li style="flex:1">N/A </li><li style="flex:1">N</li></ul>9 years DISINFECTANTS AND DISINFECTION BYPRODUCTS CONTAMINANT (UNITS) <ul style="display: flex;"><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li></ul>ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) <ul style="display: flex;"><li style="flex:1">AMOUNT </li><li style="flex:1">RANGE </li><li style="flex:1">VIOLATION </li></ul>TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">SAMPLED FREQUENCY </li><li style="flex:1">DETECTED </li><li style="flex:1">DETECTED </li><li style="flex:1">Y/N </li></ul><ul style="display: flex;"><li style="flex:1">40 </li><li style="flex:1">26 – 47 </li></ul><ul style="display: flex;"><li style="flex:1">TTHM (ppb) </li><li style="flex:1">8 samples </li></ul>quarterly By-product of drinking water (Maximum LRAA) 80 60 N/A N/A (individual <ul style="display: flex;"><li style="flex:1">[Total Trihalomethanes] </li><li style="flex:1">chlorination </li></ul>sample sites) 16 10– 21 (individual sample sites) HAA5 (ppb) [Total Haloacetic Acids] 8 samples quarterly By-product of drinking water disinfection (Maximum LRAA) 810 1 – 4 Once a month (running annual average) By-product of drinking water <ul style="display: flex;"><li style="flex:1">Bromate (ppb) </li><li style="flex:1">(running annual </li></ul>average) <ul style="display: flex;"><li style="flex:1">0</li><li style="flex:1">(individual </li></ul>disinfection measurements) 2020 N 127 samples a month except for March 3.05 (running annual MRDL = 4 (running annual average) 1.23– 3.96 (individual sites) Water additive used to control microbes Chloramines (ppm) Chlorine, Free (ppm) MRDLG = 4 average) 2.05 MRDL = 4 (running annual average) 0.67– 2.91 (individual sites) 127 samples (running annual Water additive used to control microbes MRDLG = 4 N/A in March average) Total Organic Carbon (removal ratio) <ul style="display: flex;"><li style="flex:1">Weekly </li><li style="flex:1">TT </li><li style="flex:1">1.62 </li><li style="flex:1">1.32 – 1.92 </li><li style="flex:1">Naturally present in the environment </li></ul>4CARY/APEX WATER TREATMENT FACILITY 2020 WATER QUALITY TESTING SUMMARY TURBIDITY (COMBINED FILTER EFFLUENT TURBIDITY VALUES) <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li><li style="flex:1">HIGHEST LEVEL </li><li style="flex:1">AMOUNT </li><li style="flex:1">RANGE </li><li style="flex:1">VIOLATION </li></ul>Y/N TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED FREQUENCY </li><li style="flex:1">ALLOWED (MCL) </li><li style="flex:1">GOAL (MCLG) </li><li style="flex:1">DETECTED </li><li style="flex:1">DETECTED </li></ul>0.09 and 100% < 0.3% NTU TT = 1 NTU and 95% <0.3 NTU 2020 <ul style="display: flex;"><li style="flex:1">Turbidity (NTU) </li><li style="flex:1">Every 4 hours </li><li style="flex:1">N/A </li><li style="flex:1">0.02 – 0.09 </li><li style="flex:1">N</li></ul>Soil runoff Note: Compliance with the MCL for turbidity is based on the combined filter effluent turbidity values, not the finished water turbidity values. RADIOLOGICALS <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li></ul>ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) <ul style="display: flex;"><li style="flex:1">AMOUNT </li><li style="flex:1">VIOLATION </li></ul>Y/N TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED </li><li style="flex:1">FREQUENCY </li><li style="flex:1">DETECTED </li></ul>Gross Alpha (pCi/L) Gross Beta (pCi/L) <ul style="display: flex;"><li style="flex:1">15 </li><li style="flex:1">< 3 </li></ul>4.2 Erosion of natural deposits Decay of natural and man-made deposits 50 Once every 9 years <ul style="display: flex;"><li style="flex:1">2017 </li><li style="flex:1">0</li><li style="flex:1">N</li></ul>Radium 226 (pCi/L) Radium 228 (pCi/L) Uranium (pCi/L) 32 < 1 < 1 Erosion of natural deposits Erosion of natural deposits <ul style="display: flex;"><li style="flex:1">Erosion of natural deposits </li><li style="flex:1">20.1 </li><li style="flex:1">< 0.67 </li></ul>MICROBIOLOGICALS <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL ALLOWED </li></ul>(MCL) HIGHEST LEVEL GOAL (MCLG) <ul style="display: flex;"><li style="flex:1">AMOUNT </li><li style="flex:1">VIOLATION </li></ul>TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED </li><li style="flex:1">FREQUENCY </li><li style="flex:1">DETECTED </li><li style="flex:1">Y/N </li></ul>TT = If greater than 5% of monthly samples are positive in one month, an assessment is required. 127 samples a month Total Coliform Bacteria (presence or absence) Naturally present in the environment 2020 <ul style="display: flex;"><li style="flex:1">N/A </li><li style="flex:1">0.77% </li><li style="flex:1">N/A </li></ul>0 (Note: Routine and repeat samples are total coliform-positive and either is E. coli-positive or system fails to take repeat samples following E. coli-positive routine sample or system fails to analyze total coliform-positive repeat sample for E. coli.) 127 samples a month Fecal Coliform or E. coli (presence or absence) Human and animal fecal waste 2020 <ul style="display: flex;"><li style="flex:1">0</li><li style="flex:1">0</li><li style="flex:1">N</li></ul>Cryptosporidium (oocysts/L) Human and animal fecal waste <0.010 2020 Once Once <ul style="display: flex;"><li style="flex:1">TT = 99 % removal </li><li style="flex:1">0</li></ul>0 NN Giardia lamblia (cysts/L) Human and animal fecal waste <0.010 2020 TT = 99 % removal/inactivation TRIHALOMETHANES (THMs) <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">AMOUNT </li><li style="flex:1">VIOLATION </li></ul><ul style="display: flex;"><li style="flex:1">TEST FREQUENCY </li><li style="flex:1">RANGE DETECTED </li><li style="flex:1">TYPICAL SOURCE </li></ul><ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED </li><li style="flex:1">DETECTED </li></ul>12.7 Y/N <ul style="display: flex;"><li style="flex:1">Chloroform (ppb) </li><li style="flex:1">6.6 – 21.0 </li></ul>9.9– 16 13.6 1.6 Bromodichloromethane (ppb) Bromoform (ppb) 8 samples quarterly 2020 NBy-product of drinking water chlorination 1.0 – 2.6 <ul style="display: flex;"><li style="flex:1">7.5 – 11.0 </li><li style="flex:1">Chlorodibromomethane (ppb) </li></ul>Note: Not individually regulated. 9.7 5CARY/APEX WATER TREATMENT FACILITY 2020 WATER QUALITY TESTING SUMMARY HALOACETIC ACIDS (HAAs) <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">AMOUNT </li><li style="flex:1">VIOLATION </li></ul>Y/N <ul style="display: flex;"><li style="flex:1">TEST FREQUENCY </li><li style="flex:1">RANGE DETECTED </li><li style="flex:1">TYPICAL SOURCE </li></ul><ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED </li><li style="flex:1">DETECTED </li></ul>Trichloroacetic Acid (ppb) Dichloroacetic Acid (ppb) Monochloroacetic Acid (ppb) Monobromoacetic Acid (ppb) Dibromoacetic Acid (ppb) Note: Not individually regulated. 3.0 8.7 1.6 – 5.7 6.2 – 13 No range <1 - 1.9 8 samples quarterly 2020 <2.0 <1.0 2.3 NBy-product of drinking water chlorination 1.4– 3.7 REGULATED INORGANICS <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li></ul>ALLOWED (MCL) <ul style="display: flex;"><li style="flex:1">HIGHEST LEVEL </li><li style="flex:1">AMOUNT </li><li style="flex:1">RANGE </li><li style="flex:1">VIOLATION </li></ul>Y/N TYPICAL SOURCE <ul style="display: flex;"><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED </li><li style="flex:1">FREQUENCY </li><li style="flex:1">GOAL (MCLG) </li><li style="flex:1">DETECTED </li><li style="flex:1">DETECTED </li></ul>Discharge from petroleum refineries; fire Antimony (ppb) Arsenic (ppb) Barium (ppm) Beryllium (ppb) 610 2<ul style="display: flex;"><li style="flex:1">6</li><li style="flex:1">< 3 </li></ul>retardants; ceramics; electronics; solder Erosion of natural deposits; runoff from orchards; runoff from glass and electronics production wastes 024 < 5 < 0.4 < 2 Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits Daily Discharge from metal refineries and coal- burning factories; discharge from electrical, aerospace, and defense industries No range 4Corrosion of galvanized pipes; erosion of natural deposits; discharge from metal refineries; runoff from waste batteries and paints Cadmium (ppb) Chromium (ppb) <ul style="display: flex;"><li style="flex:1">5</li><li style="flex:1">5</li><li style="flex:1">< 1 </li></ul>2020 <ul style="display: flex;"><li style="flex:1">N</li><li style="flex:1">Discharge from steel and pulp mills; erosion </li></ul>of natural deposits <ul style="display: flex;"><li style="flex:1">100 </li><li style="flex:1">100 </li><li style="flex:1">< 20 </li></ul>< 50 Cyanide, Total (ppb) Discharge from steel/metal factories; discharge from plastic and fertilizer factories 2x Annually <ul style="display: flex;"><li style="flex:1">200 </li><li style="flex:1">200 </li></ul>Erosion of natural deposits; water additive which promotes strong teeth; discharge from fertilizer and aluminum factories Daily <0.1 – 0.97 <ul style="display: flex;"><li style="flex:1">Fluoride (ppm) </li><li style="flex:1">4</li><li style="flex:1">4</li></ul>0.60 Erosion of natural deposits; discharge from refineries and factories; runoff from landfills; runoff from cropland Mercury (inorganic) (ppb) <ul style="display: flex;"><li style="flex:1">2x Annually </li><li style="flex:1">2</li><li style="flex:1">2</li><li style="flex:1">< 0.4 </li></ul>No range Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines Selenium (ppb) Thallium (ppb) 50 2<ul style="display: flex;"><li style="flex:1">50 </li><li style="flex:1">< 10 </li></ul>< 1 Daily Leaching from ore-processing sites; discharge from electronics, glass, and drug factories 0.5 6CARY/APEX WATER TREATMENT FACILITY 2020 WATER QUALITY TESTING SUMMARY ERIN LEE (Senior Laboratory Analyst) has been employed by the Town of Cary at the Cary/Apex Water Treatment Facility Laboratory since October 2005. WATER QUALITY CHARACTERISTICS <ul style="display: flex;"><li style="flex:1">CONTAMINANT </li><li style="flex:1">YEAR </li><li style="flex:1">TEST </li><li style="flex:1">HIGHEST LEVEL </li><li style="flex:1">AMOUNT </li><li style="flex:1">RANGE </li><li style="flex:1">VIOLATION </li></ul><ul style="display: flex;"><li style="flex:1">Y/N </li><li style="flex:1">(UNITS) </li><li style="flex:1">SAMPLED </li><li style="flex:1">FREQUENCY </li><li style="flex:1">ALLOWED (SMCL) </li><li style="flex:1">DETECTED </li><li style="flex:1">DETECTED </li></ul>Alkalinity, Total, as CaCO3 (ppm) Aluminum (ppm) Daily Daily N/A 0.20 N/A N/A N/A N/A 250 35 0.03 0.11 0.95 8.54 1.50 17.6 025 – 42 <0.02 – 0.07 <ul style="display: flex;"><li style="flex:1">0 – 0.28 </li><li style="flex:1">Ammonia, Free (ppm) </li></ul>Ammonia, Total (ppm) Calcium (ppm) Daily <ul style="display: flex;"><li style="flex:1">Daily </li><li style="flex:1">0.00 – 1.11 </li></ul>6.81 – 10.25 0.86 – 4.28 11.6 – 21.2 Daily Carbon Dioxide (ppm) Chloride (ppm) Daily Weekly <ul style="display: flex;"><li style="flex:1">Daily </li><li style="flex:1">Color (CU) </li><li style="flex:1">15 </li><li style="flex:1">0 – 2 </li></ul>N/A 121– 264 221 <1 <ul style="display: flex;"><li style="flex:1">Conductivity (uS/cm) </li><li style="flex:1">Daily </li></ul>Daily 2020 Geosmin (ppt) <ul style="display: flex;"><li style="flex:1">N/A </li><li style="flex:1"><1 – 6.40 </li></ul>Classified as Hardness, Total, as CaCO3 (ppm) 33 27 – 39 Daily Daily “moderately soft” Classified as “moderately soft” Hardness, Total, as CaCO3 (grains per gallon) N<ul style="display: flex;"><li style="flex:1">1 .6 – 2.3 </li><li style="flex:1">1.9 </li></ul><ul style="display: flex;"><li style="flex:1">Iron (ppm) </li><li style="flex:1">Daily </li></ul>Daily 0.3 N/A <ul style="display: flex;"><li style="flex:1"><0.06 </li><li style="flex:1">No range </li></ul>2.35– 3.34 <0.01 – 0.03 Magnesium (ppm) Manganese (ppm) Methylisoborneol (MIB) (ppt) Nickel (ppm) 2.75 <ul style="display: flex;"><li style="flex:1">Daily </li><li style="flex:1">0.05 </li><li style="flex:1">0.01 </li></ul>Daily N/A N/A <1 <0.1 0.62 7.75 3.44 31.7 37 <1 – 4.82 <ul style="display: flex;"><li style="flex:1">No range </li><li style="flex:1">Daily </li></ul>Ortho-Phosphate as PO4 (ppm) pH (SU) Weekly Daily N/A <0.05 – 0.71

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