Issue link: http://townofcary.uberflip.com/i/684048
REGULATED SUBSTANCES SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED MCL [MRDL] MCLG [MRDLG] AMOUNT DETECTED RANGE LOW-HIGH VIOLATION TYPICAL SOURCE Bromate 1 (ppb) 2015 10 0 3 ND–8.7 No By-product of drinking water disinfection Chloramines 1 (ppm) 2015 [4] [4] 2.89 1.5–3.9 No Water additive used to control microbes Chlorine 1 (ppm) 2015 [4] [4] 0.59 0.1–2.8 No Water additive used to control microbes Fecal coliform and E. coli (# positive samples) 2015 0 0 0 NA No Human and animal fecal waste Fluoride (ppm) 2015 4 4 0.78 NA No Erosion of natural deposits; Water additive that promotes strong teeth; Discharge from fertilizer and aluminum factories Haloacetic Acids [HAAs] 1 (ppb) 2015 60 NA 12.2 ND–18 No By-product of drinking water disinfection TTHMs [Total Trihalomethanes] 1 (ppb) 2015 80 NA 38.5 16–55 No By-product of drinking water disinfection Total Coliform Bacteria (% positive samples) 2015 5% of monthly samples are positive 0 0.78 NA No Naturally present in the environment Total Organic Carbon [TOC] 2 (removal ratio) 2015 TT NA 1.51 1.19–1.82 No Naturally present in the environment Turbidity 3 (NTU) 2015 TT = 1 NTU NA 0.14 0.03–0.14 No Soil runoff Turbidity 3 (Lowest monthly percent of samples meeting limit) 2015 TT = 95% of samples < 0.3 NTU NA 100 NA No Soil runoff Tap water samples were collected for lead and copper analyses from sample sites throughout the community. SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED AL MCLG AMOUNT DETECTED (90TH%TILE) SITES ABOVE AL/ TOTAL SITES VIOLATION TYPICAL SOURCE Copper (ppm) 2015 1.3 1.3 0.123 0/60 No Corrosion of household plumbing systems; Erosion of natural deposits Lead (ppb) 2015 15 0 ND 1/60 No Corrosion of household plumbing systems; Erosion of natural deposits SECONDARY SUBSTANCES SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED SMCL MCLG AMOUNT DETECTED RANGE LOW-HIGH VIOLATION TYPICAL SOURCE Sulfate (ppm) 2015 250 NA 35 NA No Runoff/leaching from natural deposits; Industrial wastes Water Testing Results D uring the past year we have taken thousands of water samples in order to determine the presence of any radioactive, biological, inorganic, volatile organic or synthetic organic substances. The table below shows only those substances that were detected in the water. Unless otherwise noted, the data presented in the table below is from testing performed January 1–December 31, 2015. The EPA and the State allow 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. In these cases, the most recent sample results are included, along with the year in which the sample was taken. Some of the data, though representative of the water quality, is more than one year old. UNREGULATED SUBSTANCES 4 SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED AMOUNT DETECTED RANGE LOW-HIGH TYPICAL SOURCE Bromodichloromethane (ppb) 2015 15 NA By-product of drinking water disinfection Bromoform (ppb) 2015 2 NA By-product of drinking water disinfection Chlorodibromomethane (ppb) 2015 12 NA By-product of drinking water disinfection Chloroform (ppb) 2015 11 NA By-product of drinking water disinfection Sodium (ppm) 2015 33 NA Naturally occurring UNREGULATED CONTAMINANT MONITORING RULE PART 3 (UCMR3) 4 SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED AMOUNT DETECTED RANGE LOW-HIGH 1,4-Dioxane (ppb) 2015 0.42 0.16–0.77 Chlorate (ppb) 2015 109 89–130 Hexavalent Chromium (ppb) 2015 0.02 ND–0.05 Perfluoroheptanoic acid (PFHpA) (ppb) 2015 0.01 ND–0.01 Strontium (ppb) 2015 61 55–68 Vanadium (ppb) 2015 0.1 ND–0.3