Down by the sandy banks of the Yamuna River, the men must work quickly. At a little past 12 a.m. one humid night in May, they pull back the black plastic tarp covering three boreholes sunk deep in the ground. They then drag thick hoses toward a queue of 20-odd tanker trucks idling quietly with their headlights turned off. The men work in a team: While one man fits a hose’s mouth over a borehole, another clambers atop a truck at the front of the line and shoves the tube’s opposite end into the empty steel cistern attached to the vehicle’s creaky frame. someone shouts; almost instantly, his orders to ‘switch it on’ are obeyed. Diesel generators, housed in nearby sheds, begin to thrum. Submersible pumps, installed in the borehole’s shafts, drone as they disgorge thousands of gallons of groundwater from deep in the earth. The liquid gushes through the hoses and into the trucks’ tanks. The full trucks don’t wait.

As the hose team continues its work, drivers nose down a rutted dirt path until they reach a nearby highway. There, they turn on their lights and pick up speed, rushing to sell their bounty to factories and hospitals, malls and hotels, apartments and hutments across this city of 25 million. Everything about this business is illegal: the boreholes dug without permission, the trucks operating without permits, the water sold without testing or treatment. ‘Water work is night work,’ says a middle-aged neighbour who lives near the covert pumping station and requested anonymity. ‘Bosses arrange buyers, labour fills tankers, the police look the other way, and the muscle makes sure that no one says nothing to nobody.’ Teams like this one are ubiquitous in Delhi, where the official water supply falls short of the city’s needs. A quarter of Delhi’s households live without a piped-water connection; most of the rest receive water for only a few hours each day. So residents have come to rely on private truck owners—the most visible strands of a dispersed web of city councillors, farmers, real estate agents, and fixers who source millions of gallons of water each day from illicit boreholes, and sell the liquid for profit.

The entrenched system has a local moniker: the water-tanker mafia. A 2013 audit found that the city loses 60 percent of its water supply to leakages, theft, and a failure to collect revenue. The mafia defends its work as a community service, but there is a much darker picture of Delhi’s subversive water industry: one of a thriving black market populated by small-time freelance agents who are exploiting a fast-depleting common resource and in turn threatening India’s long-term water security.

[Extracted, with edits and revisions, from: “At the Mercy of the Water Mafia”, by Aman Sethi, Foreign Policy]

Which of the following, used in the passage, suggests that the illegal supply of groundwater is not a recent phenomenon?