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)
Fluoride free drinking water supply in North Gujarat: The rise of Reverse Osmosis plants as a cottage industry - A study by CAREWATER
Reverse Osmosis plants, cottage industry, providing fluoride free water in North Gujrat since 1970s. Posted on 10 Aug, 2010 10:04 PM

The study by Carewater INREM Foundation explores the rise of Reverse Osmosis (RO) plants since 1970s as a cottage industry for providing fluoride free water supply in North Gujarat.

Ingress of saline water in coastal aquifers of Junagadh – A report by CAREWATER
The study attempts to create a salinity ingress profile by means of geo-chemical analysis for the Junagadh coastal area for the pre-monsoon period of 2006 Posted on 08 Aug, 2010 12:02 AM

carewaterSalinity in coastal groundwater is a widespread problem and may be caused by individual or combined effects of inherent salinity, tidal effect, irrigation by saltwater and by seawater intrusion due to extensive pumping.

Invitation for case study submission in water magazine
Everything About Water formally invitaties for editorial contribution (a Case Study) for a monthly water & wastewater magazine. Posted on 06 Aug, 2010 11:26 AM

Everything About Water

Our publication is coming up with the annual "Case Study Special Issue” in Sept. 2010. Its a collector’s issue, where we are covering leading industries across the globe.

Impacts of groundwater contamination with Fluoride and Arsenic: A report by CAREWATER
The impacts of groundwater contamination with fluoride and arsenic in India Posted on 04 Aug, 2010 10:25 AM

carewater

The field research study conducted by Carewater INREM Foundation attempts to establish the impacts of groundwater contamination with fluoride and arsenic in India. It maps the affliction severity, the medical cost and wage loss through a multi-location study in some villages in the States of Rajasthan, Andhra Pradesh, Karnataka and West Bengal.

Reverse Osmosis plants for rural water treatment in Gujarat - A study by CAREWATER
Rural Gujarat's solution for drinking water: Reverse Osmosis technology Posted on 03 Aug, 2010 10:21 PM

carewaterThe report by Carewater INREM Foundation deals with Reverse Osmosis (RO) technology, which is emerging as an important solution for drinking water treatment in rural Gujarat. RO plants with capacity ranging from 10 litres per hour (lph) to 6000 lph are now supplying drinking water in several hundred villages of the State. Small sized plants with capacity < 20 lph are used by individual families whereas medium to large sized plants (>100 lph) are being used for public consumption.

Groundwater and well water quality in alluvial aquifer of Central Gujarat - A paper by CAREWATER
Assessing groundwater and well water quality in the alluvial aquifers of Central Gujarat. Posted on 03 Aug, 2010 08:58 PM

carewaterThe report by Carewater INREM Foundation deals with groundwater and well water quality in the alluvial aquifers of Central Gujarat. Gujarat has a hydrogeology representative of almost all aquifer types and depositional & formation eras. Contamination of aquifers along with scarcity of groundwater resources due to increase in water demand and reduction in recharge of groundwater from changing landuse, is a problem in Central Gujarat.

More rice for people - More water for the planet - A WWF-ICRISAT report about System of Rice Intensification
Rice is not just the staple diet of more than half the world; It is also the largest source of rural employment and livelihood Posted on 02 Aug, 2010 02:08 AM

More rice for people - More water for the planet - A WWF-ICRISAT report about System of Rice IntensificationThis project report by WWF-ICRISAT begins by highlighting the importance of rice as a major source of calories for half the world’s population and also as the single largest source of employment and income for the rural population. 

It makes connections between rice production and its impact on the environment and argues for need to adopt techniques such as System of Rice Intensification (SRI) to improve produce and reduce the damage to the environment. 

For example, current practices at genetic uniformity can make crops more vulnerable to pests and diseases. They are also wasteful of increasingly scarce and costly resources such as water and fossil fuels. Heavily fertilised, continuously flooded rice fields produce greenhouse gases that contribute to global warming, and misuse of inorganic fertilisers and agrochemicals results in soil and water pollution. Evidence indicates that there has been a gradual slowdown in the yield gains of rice in many countries.

Rapid assessment survey of Kodaikanal lake - ENVIS Centre (TN) (2009)
Tourists endanger Kodaikanal's freshwater lake and the biodiversity dependent on it Posted on 02 Aug, 2010 02:02 AM

Rapid Assessment survey of Kodaikanal lake - ENVIS Centre (TN)This document by the Department of Environment, Government of Tamil Nadu highlights the importance of the Kodaikanal lake as an important tourist destination and warns that this freshwater lake is under the threat of getting polluted and its biodiversity endangered.

The document presents the findings of the study that aimed at assessing the physico-chemical and biological quality of the Kodaikanal lake.

Evidence indicates that unrestricted tourism activities have led to high use of plastic bottles, glass bottles, plastic bags, causing high levels of pollution and silting of the lake. Damaged fibreglass boats left inside the lakes also pose a serious threat to the lake ecosystem.

Water distribution improvement "World Bank style" in K-East Ward Mumbai - A working paper by CASUMM
Privatisation of water supply scheme in K-east Mumbai Posted on 01 Aug, 2010 03:43 PM

In this document by CASUMM, the author raises important questions regarding the recent trends towards privatisation of water supply in Indian cities by discussing the case of the water supply scheme project in the K-east ward of Mumbai.

The privatisation of the water supply scheme, which has been implemented through grants by the World Bank (WB) raises serious questions regarding the intentions of the international organisations that fail to take into consideration the local context and the needs of the people and focus exclusively on profit making.

Identification of water quality monitoring sites on Kshipra river, Ujjain, MP – A research report by National Institute of Hydrology
The study deals with identification of water quality monitoring sites on Kshipra river of Ujjain, MP. Posted on 28 Jul, 2010 07:18 PM

The study deals with identification of water quality monitoring sites on Kshipra river of Ujjain. The location of permanent sampling station is probably the most critical factor in a monitoring network which collects water quality data. If the samples collected are not representative of the water mass, the frequency of samplings as well as the mode of data interpretation and presentation become inconsequential.

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