The Water Quality Association Addresses Frequently Asked Questions about Lead in Water
Because of the ongoing problem of lead in the water of Flint, Michigan, the Water Quality Association of America (WQA), a not-for-profit organization of water treatment dealers, prepared a concise FAQ to help answer the many questions about lead. Below, we’ve excerpted the highlights.
What are potential health effects from lead?
Lead poisoning often displays no outward symptoms; however, irritability, weight loss, vomiting, constipation, and stomach pain are possible signs to look for. Young children and pregnant women are at the greatest risk, even from short-term exposure. Reduced cognitive development and neurobehavioral deficits are associated with blood levels less than 10 micrograms of lead per deciliter of blood in children. Therefore, there is no safe level for lead to be present in the blood of children. Individuals will adsorb more lead if they have poor nutrition than those with better diets.
Can a Total Dissolved Solids (TDS) meter be used to detect lead in drinking water?
No. There have been some misconceptions around TDS Meters. These meters cannot measure lead specifically; they detect the conductivity directly related to the concentration of combined total dissolved solids such as minerals, salts and metals. The typical sample of tap water in the U.S. contains approximately 350 parts per million (ppm) of TDS, which, as a whole does not on its own indicate a health concern and in many cases is used as a means to enhance taste of water. Lead concentration is found 1000 times lower at the parts per billion (ppb) level, and is too small to be detected without sophisticated instrumentation. Moreover, because TDS meters don’t measure individual ions, lead cannot be detected on its own.
Where can I go to get my water tested?
Water testing should be done be a certified testing laboratory. WQA strongly recommends water testing be conducted at each point of use in accordance with appropriate sampling procedures. The water should be checked after a period of disuse before a specific water treatment product is selected. Water conditions can change, so the water should be tested both before a treatment product has been installed and at regular intervals following installation. Studies have shown the reported levels of lead found in some Flint, MI water results are higher than conditions under which the manufacturer set the replacement recommendations for filters in published manuals. A list of certified labs in Michigan can be found here.
How do I maintain a filter once it is installed?
Always follow the manufacturer’s installation instructions and contact the manufacturer to confirm usage and capacity. To ensure the manufacturer can provide the most accurate recommendations, have test results for lead and iron on hand for review.
Where do I find a product certified for lead reduction?
American National Standards Institute (ANSI)-accredited entities offering product certification include: WQA’s Product Certification Program, NSF International, International Association of Plumbing and Mechanical Officials, and Underwriters Laboratory. All of these certifiers have product listings. To find products certified by WQA for lead reduction, click here. Contact information for local professionals and manufacturers of certified products can also be found wqa.org.