Issue link: http://townofcary.uberflip.com/i/1498729
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 2 8 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 < 3 0/60 No Corrosion of household plumbing systems; erosion of natural deposits SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) AMOUNT DETECTED RANGE VIOLATION TYPICAL SOURCE Fluoride (ppm) 2022 4 4 0.70 No range No Water additive that promotes strong teeth SUBSTANCE (UNIT OF MEASURE) YEAR SAMPLED HIGHEST LEVEL ALLOWED (MCL) HIGHEST LEVEL GOAL (MCLG) AMOUNT DETECTED RANGE VIOLATION TYPICAL SOURCE Turbidity (NTU) 2022 TT = 1 NTU and 95% of samples < 0.3 NTU N/A 0.09 NTU AND 100% of samples < 0.3 NTU 0.02–0.09 No Soil runoff D R I N K I N G WAT E R T E ST R E S U L T S DURING 2022, THE TOWN OF CARY WAS IN COMPLIANCE WITH ALL STATE AND NATIONAL DRINKING WATER REGUL ATIONS. T U R B I D I T Y Turbidity is a measure of the clarity of the water. We monitor it because it is a good indicator of the effectiveness of our filtration system. The turbidity rule requires that 95% or more of our monthly samples must be less than or equal to 0.3 NTU. Our water meets this requirement. 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 2022 was well below the maximum amount allowed (4 parts per million). The US Public Health Service's recommended fluoride level is 0.7 parts per million. 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.