The report claims more than 3.5 million people, in 120 cities, face cancer risks that are 10 to 100 times higher than the federal benchmark. Lead This carcinogen most commonly comes from solder and other plumbing products, batteries, and gasoline. It adversly affects the kidneys, nervous and reproductive systems, and also causes hypertension. Children under six are most vulnerable to lead poisoning. Known adverse affects are decreased intelligence, hearing problems and stuntedgrowth.
Water containing organic matter treated with chlorine produces THMs.
These affect mostly the nervous system and muscles. They are also a probable cause of cancer. In 1993 the EPA posted about 16,000 violations of public drinking water systems. The Natural Resources Defense Council released a report claiming nearly half of Americans should worry about the water they draw from thier taps each day. The EPA said 30 million might be at risk from lead in their drinking water.