The question asks about the minimum quantity of domestic water specifically required for drinking purposes, measured in LPCD (Litres Per Capita Per Day), according to the Indian Standard IS 1172:1993.

Water Consumption Standard IS 1172:1993

IS 1172:1993 is the Indian Standard code that provides guidelines for basic requirements for water supply, drainage, and sanitation. It specifies the minimum quantities of water needed for various domestic uses in urban and rural areas.

LPCD stands for Litres Per Capita Per Day. This unit represents the total amount of water consumed by one person on average over one day.

According to IS 1172:1993, the minimum per capita consumption of water for domestic purposes is broken down into different uses. The standard provides a specific minimum quantity allocated solely for drinking water.

• Bathing
• Washing of clothes
• Washing of utensils
• Flushing of water closets
• Drinking
• Miscellaneous

For drinking purposes, IS 1172:1993 specifies a minimum requirement to ensure basic health and hygiene. This minimum quantity for drinking is set at 5 LPCD.

While the total minimum domestic water requirement is significantly higher (often around 135 LPCD for areas with piped water supply and proper sanitation), this total is the sum of requirements for all uses listed above. The question specifically asks for the minimum requirement for drinking usage only.

Therefore, as per IS 1172:1993, the minimum domestic water consumption for drinking usage is 5 LPCD.