Indian Institute of Toxicology Research (IITR), which examined the ground water, submitted a report to the apex court saying the levels of lead, nitrate and nickel are more than permissible levels in many samples of water taken by it.
"In nine of the 30 samples, nitrate levels exceeded its permissible Bureau of Indian Standard (BIS) limits for drinking water.
Lead level in 24 samples were found to exceed its BIS permissible limit," said the report, submitted to a bench headed by Justice Altamas Kabir.
The report, however, added there is no threat because of the ground water contamination as the requirement for drinking water in the area is being met through piped water supply.
The water samples were to be examined by the institute on three parameters of physico-chemical, heavy metals and organics but organic analysis could not take place as it takes time.
The institute assured the court that it would complete the task within three months and would submit its report.