Issue link: http://townofcary.uberflip.com/i/1521780
C A RY, N O RT H C A R O L I N A A N N U A L WAT E R Q U A L I T Y R E P O R T 2 0 2 3 9 F LU O R I D E Fluoride occurs naturally in water. It is also added to drinking water to reduce tooth decay. The fluoride level in our water in 2023 was well below the maximum amount allowed (4 parts per million). The U.S. Public Health Service's recommended fluoride level is 0.7 parts per million. SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) AMOUNT DETECTED RANGE VIOLATION TYPICAL SOURCE Fluoride (ppm) 2023 4 4 0.62 No range No Water additive that promotes strong teeth L E A D A N D C O P P E R Lead and copper can enter drinking water from corrosion of household plumbing. For more information, see page 16. SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (AL) HIGHEST LEVEL GOAL (MCLG) AMOUNT DETECTED (90TH PERCENTILE) SITES ABOVE AL/TOTAL SITES VIOLATION TYPICAL SOURCE Copper (ppm) 2021 1.3 1.3 0.0988 0/60 No Corrosion of household plumbing systems; erosion of natural deposits Lead (ppb) 2021 15 0 ND 0/60 No Corrosion of household plumbing systems; erosion of natural deposits T O TA L O R GA N I C C A R B O N ( D I S I N F E C T I O N BY P R O D U C T P R E C U R S O R ) Natural organic matter that can combine with disinfectants to form disinfection byproducts. SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) AMOUNT DETECTED RANGE VIOLATION TYPICAL SOURCE Total Organic Carbon (removal ratio) 2023 TT = Removal ratio of >1 N/A 1.55 (running annual average) 1.36 –1.86 (range of monthly) No Naturally present in the environment