Summary of the City
Usually, Chennai gets 830 million litres a day from Poondi, Cholavaram, Red Hills and Chembarambakkam - which supply drinking water to the city.
Stone quarries in Kancheepuram and Thiruvallur and the two desalination plants in the city are the primary sources of drinking water now. Drinking water supply to Chennai has been slashed by 50% as Tamil Nadu stares at its worst drought in 140 years. To make matters worse, the four main reservoirs around Chennai - Poondi, Red Hills, Cholavaram and Chembarambakkam - are all running dry, which means piped water for drinking is being supplied to certain areas only once in three days. Apart from this, 180mld is drawn from Veeranam water supply project. Some 60mld is now pumped from agricultural wells and metro water-owned wells and this could go up to 100mld in summer.

Water Quality Information

Chennai City
The water quality in Chennai is a long way to reach international standards as outlined in this study published on April 2007. Researchers from National Environmental Engineering Research Institute, Chennai Zonal Laboratory, Chennai found an enteric parasitic protozoan called Cryptosporidium that causes diarrhea.
Stone quarries in Kancheepuram and Thiruvallur and the two desalination plants in the city are the primary sources of drinking water now. Drinking water supply to Chennai has been slashed by 50% as Tamil Nadu stares at its worst drought in 140 years. To make matters worse, the four main reservoirs around Chennai - Poondi, Red Hills, Cholavaram and Chembarambakkam - are all running dry, which means piped water for drinking is being supplied to certain areas only once in three days. Apart from this, 180mld is drawn from Veeranam water supply project. Some 60mld is now pumped from agricultural wells and metro water-owned wells and this could go up to 100mld in summer.
The water quality in Chennai is a long way to reach international standards as outlined in this study published on April 2007. Researchers from National Environmental Engineering Research Institute, Chennai Zonal Laboratory, Chennai found an enteric parasitic protozoan called Cryptosporidium that causes diarrhea.

Recommended Technology
For less maintenance & water wastage - UF / UF+UV
For more purity - NF 30 + UV (Maintenance & water wastage will be high)