Quality, Standards and Testing

Water needed for human consumption, industrial purposes or other requirements must cater to certain minimum standards. The quality of any water is defined by its physical and chemical properties (characteristics). Physical properties include its appearance (colour, clarity and odour, perhaps also its taste) while the chemical properties refer to the constituents dissolved in it. Some of the physical properties are measurable and can be expressed in units of measurement while others like appearance, odour or taste are clearly subjective. However, all the chemical constituents can be measured accurately.

Drinking water must meet certain quality standards to safeguard the health of the people. The permissible and desirable limits of various parameters in drinking water have been detailed as per the Bureau of Indian Standards (BIS) standard specifications for potable water. These parameters are included in BIS-10500-1991. The various parameters covered include colour, odour, pH, total dissolved solids, hardness, alkalinity, elemental compounds such as iron, manganese, sulphate, nitrate, chloride, fluoride, arsenic, chromium, copper, cyanide, lead, mercury, zinc and coliform bacteria. The tolerance limits for inland surface waters for various classes of water use have been published by the Central Water Commission. Per ISI-IS: 2296-1982, the tolerance limits of parameters are specified as per classified use of water depending on various uses of water ranging from Class A to Class E.

What does the water that one drinks contain, what substances are dissolved in it and what are their safe limits? What are the issues that affect water quality? For more detailed information on all this, please read our FAQs on Rules, Regulations & Standards concerning water and Equipments used to measure water quality and quantity

Featured Articles
July 8, 2022 Indian rivers are experiencing rising temperatures, which can lower the oxygen carrying capacity of their waters and spell doom for living organisms, small and large living in the waters.
The Karamana river in Thiruvanathapuram, Kerala (Image Source: India Water Portal)
June 22, 2021 Nonylphenol and its ethoxylates in drinking water: A health challenge
Water treatment facilities are incapable of removing many chemical compounds and need to be upgraded (Image: PxHere)
December 2, 2019 Water stewardship is an approach predicated on the concept that water is a shared resource and so water risks are also shared risks that everyone in a catchment will face
Picture credit: Romit Sen
November 21, 2019 A report by NIUA brings to light the chinks in Jaipur's sewage system and suggests some solutions.
Routine check done by the sewage treatment plant staff in Delawas, Jaipur. The plant is part of the ADB best practices projects list. (Image: Asian Development Bank, Flickr Commons)
Over 60 pc river stretches polluted: Government
News this week Posted on 16 Aug, 2017 06:09 AM

Govt says out of 445 river stretches, 275 are polluted

Polluted Yamuna river in Agra (Source: IWP Flickr photos)
India surges ahead in science and technology
India has made significant contributions in the field of science and technology. It is expected to grow in the years to come. Posted on 14 Aug, 2017 08:19 PM

As India completes 70 years of its independence, let’s take a moment to introspect the contribution of science and technology to national development. Several scientific and technological developments have touched the lives of common people, though limelight is often hogged by achievements in fields like space and atomic energy.

The blue revolution changed the way India looked at its marine wealth. (Source: IWP Flickr photos)
Bad times at Baddi
Unless industries clean up their act and authorities take it up seriously, Baddi’s water will continue to be polluted causing hardship to its residents. Posted on 09 Aug, 2017 05:59 AM

When Satya Devi was a child, the open well near her house in the village of Malku Majra was the water source for the household. She reminisces, “The water was clean and soft. The well would never go dry.

The state pollution control board insists that none of the factories in the area allow any pollutants to be discharged into the environment. The state of the surface water bodies, however, belies this statement.
What happens to your e-waste?
Though informal e-waste handling, segregation and import are prohibited by the law, e-waste business is thriving in the country. Posted on 05 Aug, 2017 05:44 PM

Take a walk through the maze of lanes at Seelampur in north-east Delhi, you could see small children rummaging through electronic waste that has made its way here from all over north India. They segregate end-of-life electrical and electronic products, prise them apart, put them through acid wash and also burn circuit boards in the hope of extracting precious metals.

Boys sort discarded computer parts as sparks fly from a grinding machine.  (Image: Greenpeace, Flickr Commons; CC BY-ND 2.0)
Playing the soil health card
Is the soil health card scheme introduced to improve the economic condition of the farmers by bettering the health of the soil effective? Posted on 01 Aug, 2017 11:49 AM

Decades of skating over environmental concerns have clearly cost us dear. The folly of pursuing better crop yields using chemical fertilisers in an indiscriminate manner has been surfacing lately. “Decades of agricultural abuse using fertilisers, herbicides and pesticides have taken its toll on us.

The electrical conductivity of a diluted soil sample is being tested as a measure of soil salinity. (Image:CSIRO, Wikimedia Commons; CC Attribution 3.0 Unported)
Accessing clean water easily
An innovation makes it possible to treat water even before it leaves a hand pump or a borewell, giving easy access to safe water in remote areas. Posted on 26 Jul, 2017 12:20 PM

The United Nations, in its sustainable development goals (SDGs), has earmarked 2030 as the year by which universal and equitable access to safe and affordable drinking water for all is to be achieved.

Faecal contamination of water is a big issue in rural areas. (Source: Taraltec)
Asia is at high risk of flooding: Report
News this week Posted on 18 Jul, 2017 12:25 PM

Asia has the highest number of people exposed to flooding: Report

A woman wades through a flooded road. (Source: IWP Flickr photos)
Blind spots in WASH
Many gaps in the various WASH programmes need to be fixed to ensure the ultimate goal of sustainable access to water and sanitation for all by 2030. Posted on 08 Jul, 2017 07:48 PM

The current set of government programmes such as Swachh Bharat Mission (SBM), National Rural Drinking Water Programme (NRDWP) and Atal Mission for Rejuvenation and Urban Transformation (AMRUT) have gone a long way in improving access to water and sanitation services in India.

Drinking water situation in India continues to be grim. (Source: IWP Flickr photos)
Every drop that matters!
A short film provides insight into the water sector situation in the Marathwada region in Maharashtra. Posted on 27 Jun, 2017 10:12 PM

The people of the Marathwada region have been facing severe water crisis for more than three decades. Despite adverse circumstances, the Akoladev panchayat in the Jalna district has set an example for other panchayats by solving their water woes through community participation and effective water harvesting measures that suit their geographic terrain.

Jivrekha river, Akoladev (Source:Dilasa)
Clean Kali: All eyes now on government
The water of East Kali is heavily polluted. It would hopefully change with the NGT taking notice of it. Posted on 03 Jun, 2017 07:58 AM

Rampura, situated in Bulandshahr district in western Uttar Pradesh, is one of the 1,200 villages on the banks of the 300-km long East Kali, a tributary of the Ganges. The river is named after goddess Kali who, according to the Hindu mythology, is fierce and fights evil by ingesting it.

The polluted Kali river. (Image source: Neer Foundation)
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