Check those documents:

this website is hosted by Indian Institute of techonology

http://ismenvis.nic.in/Database/Environmental_Standards_7391.aspx

My best regards

Hi Uddipta,

Please see the article (2010) below, section 5 permissible limits.

Chapter Lead Environmental Pollution in Central India

Regards

Martin

The concentration of lead in industrial wastewater limit is 1.0 mg/L by Environmental Protection Agency (EPA 2002). The maximum permissible limit of lead in inland surface water is 0.1 mg/L by CPCB, India. Heavy metal pollution has become one of the serious environmental problems of worldwide concern because of their extreme toxicity and tendency for bio accumulation in the food chain even in relatively low concentrations. Toxic heavy metals cause serious threat to the environment, animals and humans because of their non biodegradable nature, long biological half lives and their potential to accumulate in different body parts. Excessive accumulation of heavy metals in agricultural soil through wastewater irrigation may not result in soil contamination, but also erected food quality and safety. Due to the rapid growth of industrialization, the environment specially the atmosphere and the water body or hydrosphere are largely exposed to pollution, insufficient treatment or improper disposal of those wastes can vastly damage the living organism. Wastewater treatment is not given the necessary priority and therefore, industrial waste is discharged into receiving water bodies without treatment. As a result, proper management of wastewater is essential. To plan and implement the type and extent of its treatment, studying the kind and extent of toxicity of pollutants really prerequisite.