Orange County NC Website
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i~ <br />Zinc -Zinc in drinking water can occur when corrosive properties of the water leach zinc from <br />metal plumbing components. Zinc levels above .015 mg/1 can cause a metallic taste to the water. <br />The recommended drinking water limit for Zinc is 5.9 mg/1. <br />Comparison data for Orange County is not <br />available <br />• Health effects - Atthe levels detected, there are no health risks. <br />• Remedial action -Controlling zinc in water is achieved by addressing the corrosive <br />properties of the water by installing a pH neutralizer and /or a water conditioner, <br />Radon <br />Radon is a naturally occurring radioactive gas found in most of NC's groundwater, especially in the <br />Piedmont area where granite is common. Radon in soil under homes is the biggest source of radon <br />in indoor air, and presents a greater risk of lung cancer than r°adon in drinking water. <br />The recommended drinking water limit for Radon is: <br />.300 PicoCuries per Liter (pCi/L) for states that have no EPA approved radon in indoor air program, <br />4000 PicoCuries per Liter (pCi/L) for states that have a radon in indoor air program, <br />Radon (water) <br />• Health Rislcs -Radon in water is not currently considered a health risk on its own. It does <br />contribute directly to the radon in air levels. See below for the health effects of radon in air. <br />• Remedial action -Water treatment systems are available (activated carbon filters or <br />aerators) to treat radon in water, however in the absence of elevated air radon in these homes, <br />Page I S of 47 <br />