Explanation:

As there is no cure for lead poisoning, identifying local sources is a very important part of preventing exposure.

• Lead is a potent neurotoxin that, with even low-level lead exposure, is associated with a reduction in IQ scores, shortened attention spans, and potentially violent – and even criminal – behavior later in life.
• According to the World Health the maximum allowable concentration of lead in drinking water are 0.01 mg/l 

Effects of lead poisoning

• Lead can cause permanent damage to the brain and nervous system, resulting in decreased IQ and increased behavioural problems.
• Older children have higher risk of kidney damage and cardiovascular diseases.
• India has the largest number – more than 275 million children – with blood lead levels of more than five micrograms per decilitre.
• Children living at or near lead acid battery recycling workshops in India, have been found to have lead levels up to 190 micrograms per decilitre.

Hence only statement 1st is correct.