Issue link: http://townofcary.uberflip.com/i/1370617
2 0 2 0 W A T E R Q U A L I T Y R E P O R T 9 EMERGING CONTAMINANTS SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HEALTH ADVISORY AVG. AMOUNT DETECTED RANGE VIOLATION SOURCE 1,4-Dioxane (ppb) 2020 35 0.12 <0.07 – 0.71 NA By-product in paint strippers, dyes, greases, antifreeze, aircraft deicing fluids, deodorants, shampoos, cosmetics, manufacture of pharmaceuticals, and manufacture of PET plastic. Perfluorobutanesulfonic acid (PFBS) (ppt) 2020 N/A 3.3 2.8- 4.0 N/A Man-made chemicals used for waterproof and stain proof fabrics, nonstick cookware, some food packaging materials, and fire suppression foams. Perfluorobutanoic acid (PFBA) (ppt) 2020 N/A 9.6 8.2 - 11 N/A Perfluoroheptanoic acid (PFHpA) (ppt) 2020 N/A 5.2 3.1 – 8 N/A Perfluorohexanoic acid (PFHxA) (ppt) 2020 N/A 10.9 7.8 - 15 N/A Perfluorooctane sulfonate (PFOS) (ppt) 2020 N/A <2 <2 – 2.3 N/A Perfluorooctanoic acid (PFOA) (ppt) 2020 N/A 3.7 3.2 – 4.4 N/A Perfluoropentanoic acid (PFPeA) (ppt) 2020 N/A 12.4 9.6 - 17 N/A Total PFOA + PFOS (ppt) 2020 70 4.3 3.2 – 6.7 No For a complete list of substances tested, including non-detects, see 2020 Water Quality Testing Summary online: https://bit.ly/2V64k5C UNREGULATED SUBSTANCES SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (MCL) AMOUNT DETECTED RANGE VIOLATION TYPICAL SOURCE Bromodichloromethane (ppb) 2020 N/A 14 No range N/A By-product of drinking water disinfection Bromoform (ppb) 2020 N/A 1.7 No range N/A By-product of drinking water disinfection Chlorodibromomethane (ppb) 2020 N/A 10 No range N/A By-product of drinking water disinfection Chloroform (ppb) 2020 N/A 13.0 No range N/A By-product of drinking water disinfection Sodium (ppm) 2020 N/A 31.7 29.4 - 34 N/A Naturally occurring UNREGULATED CONTAMINANT MONITORING RULE 4 SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (MCL) AVG. AMOUNT DETECTED RANGE VIOLATION TYPICAL SOURCE Manganese (µg/L) 2020 N/A 5.966 <0.4 - 23.3 N/A Naturally occuring element; commercially available in combination with other elements and minerals; used in steel production, fertilizer, batteries and fireworks; drinking water and wastewater treatment chemical; essential nutrient HAA6Br (ug/L) 2020 N/A 15.03 5.73 - 20.76 N/A By-product of drinking water disinfection HAA9 (ug/L) 2020 N/A 27.451 13.33 - 40.7 N/A By-product of drinking water disinfection We also tested for the following unregulated compounds as part of UCMR4 and they were not detected: Germanium, alpha-Hexachlorocyclohexane, Chlorpyrifos, Dimethipin, Ethoprop, Oxyfluorfen, Profenofos, Tebuconazole, Total Permethrins (cis & trans), Tribufos, Butylated hydroxyanisole, o-Toluidine, Quinoline, 1-Butanol, 2-Methoxyethanol, 2-Propen-1-ol, Anatoxin-a, Cylindrospermopsin, Total Microcystins & Nodularins