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Water supply and sanitation in India

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Through Water, Sanitation and Water supply

The share of Indians with access to improved sources of water increased significantly from 72% in 1990 to 88% in 2008 and stood at 98.7% in 2018. However, many people still lack access to water and sewage infrastructure.

Water supply

Cities

In 2005, none among 35 Indian cities with populations above one million distributed water more than a few hours per day, despite generally sufficient infrastructure. Due inadequate water pressure, people struggled collecting water even when available. Service benchmarking carried out 2006 across 28 cities found average supply duration around 3.3 hours daily, ranging from one hour every three days up 18 hours daily. A 2007 study showed that 20 cities recorded average supply duration only 4.3 hours daily. Longest duration reached 12 hours daily at Chandigarh, while lowest remained 0.3 hours at Rajkot. By 2015, 88% total population had access at least basic water, reaching 96% urban and 85% rural areas. Thus, nearly 163 million people lacked access to clean water close to their homes.

In Delhi land usage for residential area varies widely from planned colonies to unplanned slums. Despite the large piped network, with some areas receiving intermittent water supply, there are large areas that lack coverage. Reliance on dubious private water vendors is costly. For example, in Delhi water trucks get water from illegal wells on the banks of the Yamuna River for ₹200 per cubic metre or ₹0.75 per US gallon ($2.6/m3 or 1 ¢/US gal).

The supply of cities that depend on surface water is threatened by pollution, increasing water scarcity and conflicts among users. For example, Bangalore depends to a large extent on water pumped since 1974 from the Kaveri river, whose waters are disputed between the states of Karnataka and Tamil Nadu. As in other Indian cities, the response to water scarcity is to transfer more water over large distances at high costs. In the case of Bangalore, 500,000 cubic metres (18,000,000 cu ft) of water is pumped per day over a distance of 100 km (62 mi), thus increasing the city's supply by two-thirds.

Jamshedpur provided 25% of its residents with continuous water supply in 2009. In 2021, some parts of Mumbai got 24 hour supply, others got 19 hours supply or less. Puri became the first city in India to get a piped 24 hour continuous drinking water quality water supply. Trivandrum is the largest Indian city and the only million agglomeration that enjoys uninterrupted hygienic water supply. Chennai has two desalination plants: the Nemmeli and Minjur.

Towns

Malkapur is the first Indian town to provide 24/7 water supply with 100 per cent coverage. The programme started in 2008 as a pilot project and soon covered the entire city. The connection is 100 per cent metered with telescopic tariff.

Rural

Kaapil has been successful in providing continuous piped water supply to all households.

Other water sources

Rainwater harvesting

In the early 21st century, India began heavily investing in rainwater harvesting infrastructure and policy as an urgent response to water scarcity. In 2001, Tamil Nadu became the first Indian state to make rainwater harvesting compulsory in every building to avoid groundwater depletion. In Rajasthan, rainwater harvesting has traditionally been practised by the people of the Thar Desert. Increase in rainwater harvesting efforts across the nation have revived ancient water harvesting systems in Rajasthan, such as the chauka system from the Jaipur district. Other large cities like Pune, Mumbai and Bangalore all have varying rules for mandatory rainwater harvesting, especially in new buildings. In 2002, the Municipal Corporation of Greater Mumbai required all new buildings over 1,000 square metres (11,000 sq ft) to have rainwater harvesting infrastructure. The law was expanded in 2007 to 300 square metres (3,200 sq ft). The goal was to ensure buildings had enough water to last them through non-monsoon seasons. The process included a catchment system, an initial flush, and extensive filtering. As of 2021, the Brihanmumbai Municipal Corporation (BMC) reported 3000 newly constructed or redeveloped buildings with rainwater harvesting infrastructure. However, many residents have complained that the stored water is contaminated, turning saline and brackish. Experts and residents argue that BMC authorities have done little to take implementation seriously, and the actual effectiveness of the rainwater harvesting mandate is unknown.

While rainwater harvesting in an urban context has gained traction in recent years, evidence points toward rainwater harvesting in rural India since ancient times. The type of system varied depending on the geography and culture of the region. Himachal Pradesh, for example, relied on kuhls, a community-owned rainwater irrigation system. Maharashtra predominately used bhandara phads, a check dam which lowers the velocity of flow from rivers and reduces erosion. On the onset of British rule in the early 19th century, many of these systems were abandoned. Environmentalists and scholars now believe that agricultural communities should revive ancient techniques to allow for rainwater harvesting to source the water needs of the community.

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