DAP's Klang MP Charles Santiago has urged the Selangor government to release the Health Department's report on water from mining ponds that is being channelled into Sungai Selangor to overcome the state's water shortage.

"The report should detail the chemical content including polluting or toxic substances, if any, in the various mines," he said in a statement today.

He is referring to the state government's contingency plan of pumping water from abandoned mining ponds into the river to supply to water treatment plant as the Sungai Selangor dam is at a critical level.

Selangor Menteri Besar Abdul Khalid Ibrahim (right) had assured that the method is safe as the mining ponds have been unused for a long time and the health department had no safety concerns over the move.

However, Santiago said he had received many complaints from health professionals who are unconvinced by the assurance.

"There is a fear that these abandoned mining ponds have over the years become depositories of polluting and toxic substances including radioactive material.

"Most of the mine-ponds would not have been managed or treated for rehabilitation," he said.

As such, he said channelling this water into Sungai Selangor would be tantamount to polluting it and the water treatment plants are not equipped to clean heavy metals and toxic substances.

"Such a scenario has a tendency to create a major health crisis," he said.

The state government have began pumping water from mining ponds into Sungai Selangor since March 1.

At present, there are nine pumps with a capacity of approximately 450 million litres per day doing this and the state government is in the process of acquiring 10 more high capacity pumps.