A prominent DAP parliamentarian appears to have lost his patience with the Pakatan Rakyat-led Selangor government for its insistence in using water from abandoned tin mining pools for public consumption.

Klang MP Charles Santiago, who for years had worked alongside the state government and Menteri Besar Abdul Khalid Ibrahim ( right ) in fighting the Selangor water privatisation agreements and the main concessionaire Syarikat Bekalan Air Selangor (Syabas), today threatened legal action against the state.

Charles demanded that the state makes public its findings on the metal concentration in the mining pool water in Bestari Jaya immediately, failing which he would have "no choice" but to take legal action.

The state government wants to channel water from the former mining pools in Sungai Selangor to combat possible drought as a result of the El Nino weather phenomenon.

"The water from the mining pools will be hazardous to our health and would end up polluting Sungai Selangor," Charles told a press conference in the lobby of Parliament.

Charles ( left ) has been vehemently opposing the plan to extract water from abandoned mining pools since the state came up with this idea during the recent dry season in the state.

"I'm asking for the study results (of the state government) for the last time. If not, I will go to court and make the state conduct this study for public health and transparency," he said.

Charles quoted studies from two international journals, both from Universiti Malaya, which he had revealed before , to prove the existence of "poisonous" metal concentration in the Bestari Jaya tin mining pool.

"Disprove this study. I'm giving you two weeks to do so," Charles told the state government.

He pointed out that the water treatment plants do not have the capacity to clean up this level of metal concentration as reported in the independent studies.

According to the studies, the mining ponds are contaminated by at least five types of poisonous metals - arsenic, copper, lead, tin and zinc.

“The state government might end up giving poisonous water to the people,” he said.