Bengaluru is home to some ten million people. It might also be the next city to experience “day zero”: when it runs out of ground water entirely.

But in settlements just outside the city centre, people already live without municipal water supplies. Our research found that families—largely women—must piece together drinking, cooking and washing water through a mixture of limited tap supply, communally bought canned water, and “water ATMs.”

It takes enormous time, energy, and money to negotiate these water markets. Bengaluru offers a glimpse of a possible future, as more cities around the world approach “day zero.”

Beyond municipal water

In settlements just outside the city centre, the reach of the official water board is limited. These areas are not serviced by the municipality’s supply of Kaveri River water. Low-income households, especially migrants, living in these neighbourhoods have to negotiate limited water sources that are available in a narrow window of time.

The Bengaluru water board does supply a range of tanker water services. However, tanker water is typically used for washing, cleaning, and other household purposes, but not for cooking and drinking. Residents feel that this tanker water is “dirty” and complain that it causes sore throats and gastrointestinal problems when consumed directly.

To access drinkable water, some of the more fortunate areas have access to pipe connections where water flows once a week for an hour or so. However, the bore wells connected to these pipes are continually at risk of being depleted.

The “lineman” of a given neighbourhood is the one who decides which area will get water from these pipes, and at what hours. However, such decisions are limited by the availability of groundwater, which has to remain untouched periodically to create sufficient “recharge” of groundwater for adequate discharge. This limited supply forces the households to look elsewhere for drinking and cooking water.

Some places have access to water kiosks or water “ATMs.” These water kiosks are also connected to groundwater sources and water filters. A household pays Rs5 ($0.07) for 20 litres of water.

If kiosk water is limited or absent, residents have to depend on “canned” water for drinking and cooking purposes. One such plastic can of 20 litres costs between Rs25 to Rs35 depending on locality and frequency of purchase.

The more reputable brands cost as much as Rs70, which is far beyond the reach of the poor. An average household of five members needs about three to five cans a week.

If a “can” delivery service refuses to deliver to households in one of these remote neighbourhoods, entrepreneurs arise to fill in the supply gap. Geetamma, who runs a small eatery in one such neighbourhood, buys 20-litre cans in bulk and resells these to households with a small profit margin of Rs2 per can.

When municipally supplied or purchased tanker water is insufficient, households purchase water from private tankers. It is priced at Rs300-Rs500 per tanker for 4,000-5,000 litres. Households collect the water in underground concrete tanks or in 200 litre plastic drums. In some neighbourhoods, residents collectively buy tanker water by pooling resources. The poorest migrants often resort to the collective option, or even to buying in smaller per-bucket quantities of 15 litres for Rs2.

The range of ways that people access water in peri-urban Bengaluru demonstrates that some transactions are formal, some are informal, and that others are a peculiar combination of both.

A huge cost

To secure water supplies from all these varied sources, people must spend a huge proportion of their income. A back-of-the-envelope calculation suggests that the monthly spend on water for a low-income household is between 5% and 8% of total income. Despite this relatively high rate of expenditure, such households are still far below the minimum target supply of 70 litres per person per day.

This limited water supply also comes at the cost of time. Based on our sampling of experiences in seven neighbourhoods of southeast Bengaluru, adult women such as Manjula typically spend between 3 to 5 hours a week working to secure water supplies—time that could be used to supplement household income.

The water markets in Bengaluru rely heavily on interpersonal relationships and collective action. These communities have so far been resilient and resourceful, but the formal and informal systems are in a delicate balance. One big supply-side shock can at any time distort this equilibrium.

Georgina Drew, senior lecturer, University of Adelaide; Amalendu Jyotishi, and Deepika M G, associate professor. This article is republished from The Conversation under a Creative Commons license. Read the original article. We welcome your comments at ideas.india@qz.com.