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

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Featured Articles
September 2, 2024 Recommendations made by an expert committee, the NGT's subsequent orders, and a critical analysis of these developments
Drum screens at Bharwara sewage treatment plant (Image: India Water Portal)
January 30, 2024 The workshop provided inputs into the newly formed committee for “Standard Operation Procedure for Quality Testing of Drinking Water Samples at Sources and Delivery Points”
Sector partners come together to supplement the efforts of the government on water quality and surveillance (Image: Barefoot Photographers of Tilonia)
October 4, 2023 वैज्ञानिकों को पहली बार बादलों में सूक्ष्म प्लास्टिक (माइक्रोप्लास्टिक) की मौजूदगी के सबूत मिले हैं। शोधकर्ताओं का भी मानना है कि इसका जलवायु और समुद्री पारिस्थितिकी तंत्र पर गंभीर प्रभाव पड़ सकता है।
बादलों में प्लास्टिक के कण
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)
Ganga clean up: It’s all talk and no action
While crores of rupees have been allocated for cleaning up Ganga, the river continues to flow filthy. Posted on 19 Sep, 2018 12:06 PM

As the Ganga emerges from the glaciers and glides along the foothills of the mighty Himalayas through the towns and cities with their sprawling ghats, engineered embankments, hydroelectric dams, and interrupted flows at barrages, the icy chilliness of its waters is lost.

The Ganga at Garhmukteshwar (Image: Chicu Lokgariwar, India Water Portal)
The art of saving a river
Artist and environmentalist Madhavi Kolte is on a mission to save the dying Mutha in Pune through her drawings and sculptures. Posted on 03 Sep, 2018 03:01 PM

River Mutha, the pride of Pune, lovingly called 'Muthai' or 'mother Mutha', is dying a slow death, thanks to the rapidly urbanising city which is depositing huge amounts of untreated sewage and dirt in its water. The pollution of the river is consistently rising.

The highly polluted Mutha river as it flows through Pune. (Image Source: India Water Portal)
World Water Week: Companies must look beyond own operations to enhance water stewardship
Updated Global Reporting Initiative (GRI) standard requires reporting on water impacts across the value chain. Posted on 30 Aug, 2018 10:37 AM

Access to freshwater is essential for all life and is a human right recognised by the United Nations. However, millions of people around the world face water scarcity, poor water quality, and inadequate sanitation.

Water, a precious commodity. (Source: IWP Flickr photos)
Simplifying defluoridation
A new device makes defluoridation simple and easy to execute in remote areas where fluorosis is found to be severe. Posted on 19 Aug, 2018 09:12 AM

Estimates suggest that about 10 million Indians are affected by fluorosis, a sickness associated with the consumption of increased concentrations of fluoride, mostly through water. Bones get weakened due to excessive accumulation of fluoride in them which results in increased hip and wrist fractures. Dental enamel gets eroded.

The Superfloc promises a sustainable and cost-effective solution to fluorosis. (Image: Martijn Nitzsche)
Floods wreak havoc in Kerala
News this week Posted on 15 Aug, 2018 10:03 AM

Kerala floods take 38 lives, severe loss reported

An aeriel view of the flooded locality of Aluva after heavy rains in Kerala. (Source: India TV)
Toxins on our plate
There is a need for better regulation and monitoring to bring toxin-free food to the Indian market. Posted on 08 Aug, 2018 03:45 PM

“The recent scare due to the detection of formalin-laced fish across Goa, Kerala, Assam, Manipur, Nagaland and Meghalaya points to a link between water quality and food safety. Fish traders find it cost-effective to use formalin, a carcinogen, instead of ice to prevent the decomposition of fish during transportation to distant markets.

The quality of food products and their safety are mostly decided at the primary production stage itself which is unregulated. (Image: Masahiro Ihara, Flickr Commons CC BY 2.0)
Yamuna river at its healthiest due to floodwater: Experts
News this week Posted on 07 Aug, 2018 06:58 PM

Yamuna river water quality improves, thanks to floodwater: Experts

Yamuna river in Delhi (Source: Sudhanshu Malhotra via IWP Flickr Photos)
Trash out: People get together to clean the Himalayas
The Himalayan Cleanup where people collected and sorted trash threw up useful information on the main culprits behind trash piles in the Himalayas. Posted on 06 Aug, 2018 10:50 AM

My first trek in the Himalayas was a transcendental experience. Even a decade after, I remember the intense beauty of every vignette I came across. That’s why I was excited about the Himalayan Cleanup, held on May 26 this year.

Volunteers sort plastic trash during the cleanup. (Pic courtesy: Zero Waste Himalaya)
No water security without water quality
A study points out that pit latrines with onsite sanitation systems are a source of groundwater contamination. Posted on 16 Jul, 2018 10:19 AM

Groundwater is a major source of water for a large number of Indians with 66 percent rural households and 27 percent urban households directly depending on it for drinking purposes, as per Census 2011.

Unsanitary conditions lead to groundwater contamination. (Image: SuSanA Secretariat, Attribution [CC BY 2.0])
Safe water to fight fluorosis
What Basubai and her children needed to fight fluorosis was access to safe drinking water. Posted on 12 Jul, 2018 12:06 PM

Basubai is a mother of three young children—Ajay (9), Manju (11) and Sonu (13). She is married to Mukesh Singh in Jamniamota village in Bakaner block in Dhar district, Madhya Pradesh.

Village woman shows her fluorosis-affected teeth. (Pic courtesy: PSI)
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