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Lead is a nightmare to regulate because unlike other water contaminants it enters drinking water through pipes and plumbing fixtures after the water leaves the treatment plant.
Deteriorating lead paint can produce dangerous lead levels in household dust and soil. [125] Deteriorating lead paint and lead-containing household dust are the main causes of chronic lead poisoning. [35] The lead breaks down into the dust and since children are more prone to crawling on the floor, it is easily ingested. [124]
The problem was addressed in 2004 by adding additional treatments to the water, preventing the chloramine from dissolving lead in the water mains, solder joints, and plumbing fixtures. In 2010, the CDC reported that 15,000 homes in the Washington, D.C., area might still have water supplies with dangerous levels of lead.
If more than 10% of tap water samples exceed the lead action level (or the copper action level of 1.3 ppm), the supplier must take additional steps to control corrosion. Other actions may include installation of treatment, checking of source water, removal of lead-containing plumbing, and public education.
Although lead has been banned from paint since 1978, lead poisoning still occurs. A medical expert explains the signs and symptoms of this public health problem.
Providence’s tap water had had dangerous lead levels for years. Around the country, utilities have been leaving lead pipe in the ground even when it is easiest to remove during water main work ...
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