BIS has published following standards for water for human consumption which give limits of various

BIS has published following standards for water for human consumption which give limits of various parameters including chemical parameters:
IS 10500:1991 Drinking water - Specification.
IS 14543:2004 Packaged Drinking Water (Other than Packaged Natural Mineral Water) - Specification.
IS 13428:2005 Packaged Natural Mineral Water - Specification.
IS 4251:1967 Quality tolerances for water for processed food industry.
IS 3957:1966 Quality tolerances for water for ice manufacture.
BIS has also published a standard for irigation water namely IS 11624:1986 Guidelines for the quality of irrigation water.

Safe Drinking Water Guidelines in India

World Health Organisation reported that in 1975, about 1230 million people were without safe drinking water supplies. This appalling fact leads to the United Nations in declaring International Drinking Water Supply and Sanitation decade, beginning in 1981. Further, the VI Five Year Plan of India had made a special provision for availability of safe drinking water to the masses.

Standard For Safe Drinking Water

The Bureau of Indian Standards (BIS) has specified drinking water quality standards in India to provide safe drinking water to the people. It is pertinent that drinking water sources be tested at regular intervals and ensure that water is meeting the prescribed standards or not, if not, then, the extent of contamination/unacceptability and follow up required.

Another guideline for water quality is prescribed by Ministry of Water Resources, Government of India in 2005. This is known as the Uniform Protocol for Water Quality Monitoring. The increasing risk of geogenic and anthropogenic contamination has led to necessitate the above.

What is the drinking water quality? According to Central Ground Water Board, BIS (IS_10500 and revised module IS 10500:2012) has specifications in Uniform Drinking Water Quality Monitoring Protocol. This standard has two limits i.e. acceptable limits and permissible limits in the absence of an alternate source. If any parameter exceeds the limit, the water is considered unfit for human consumption.

In broad terms, if the water is bacteriology contaminated (E-coli and viruses etc), or if chemical contamination exceeds maximum permissible limits, the BIS considers that water unfit for drinking.

Together We Can offer the latest drinking water specifications as per the BIS. According to BIS 1500-2012 the acceptable limit of bacteria and other major contamination are as follows:

Test parameter	Acceptable limit	Permissible limit (In the absence of alternate source of water)
pH value	6.5-8.5	No relaxation
Turbidity	1	5
Total hardness as CaCo3, mg/l, Max	200	600
E.coli presence/absence	Shall not be detectable in any 100ml sample	Shall not be detectable in any 100ml sample
Total iron as Fe, mg/l, Max	0.3	No relaxation
Taste	Agreeable	Agreeable
Odour	Agreeable	Agreeable