Facts Box: BIS draft standard for drinking water supply
The Bureau of Indian Standards has prepared a draft standard for the supply of piped drinking water. It has been named “Drinking Water Supply Quality Management System-requirements for piped drinking water supply service”.
The draft was prepared by the BIS Public Drinking Water Supply Services Sectional Committee. The draft was developed with the aim to provide safe and adequate drinking water to rural households by 2024.
Key Features of the draft
- After treatment drinking water should conform to Indian Standard (IS) 10500. This standard was developed by BIS
- District Metering Area concept should be adopted as early as possible
- Water should be sampled every four hours at the treatment plants. Also, at the water reservoirs in the distribution system, water should be sampled every eight hours. Also, random water sampling should be done at households
- Water audit should be conducted on quarterly basis. It is the calculation of amount of water that is put to distribution as against the amount that is consumed.
District Metering Area
It is a concept that controls leakages in the water network. Under the system, an area is divided into a number of sectors where the flow meters are installed to detect the leaks.
It gives standards to the limit of substances in drinking water. This includes heavy metals such as arsenic and pH of the water, dissolved salts, colour, odour and turbidity.
Standards about the Water Supply Process
- The supply system according to the draft begins with raw water sources. The water from these sources should be pumped into treatment plants and treated to achieve acceptable drinking standards
- There should be reservoirs to distribute the stored water.
- Pumping stations should be provided to provide adequate pressure throughout the distribution systems.
- Meters and Valves should be installed throughout distribution systems as control devices.