On Friday the government of Lanzhou, China, informed its 3.6 million residents that their drinking water would be carcinogenic for the next 24 hours. Benzene, a chemical used in plastics manufacture, was the immediate cause, but that wasn't even the most horrifying revelation to come from this crisis. Today, reports from state media revealed that the benzene had been released into the environment as a result of oil pipeline explosions -- in 1987 and 2002. The pipelines, owned by state-owned China National Petroleum Corporation, were repaired at the time. Some 34 tons of contaminated soil, however, were left in place, the benzene allowed to migrate into an underground water duct that empties out via household faucets.

Choking China

It’s a horrifying revelation, but not an uncommon or surprising one. Indeed, even though air pollution gets the headlines, it’s water pollution that will stand as the enduring, hazardous legacy of China’s industrial renaissance. The examples are rife and often revolting. In 2013, 16,000 dead pigs floated down Shanghai’s Huangpu River; in 2005, a chemical explosion in Jilin Province released 100 tons of toxic chemicals, including benzene, into the Songhua River, creating a 50-mile slick. Smaller incidents are rarely reported but visible across rural China where, in my experience, every town shares two features: an elaborate Communist Party headquarters, and a poisoned canal.

The Chinese government knows it has a problem, and in recent years it’s released national-level data that paints a devastating picture. In 2012, for example, the Ministry of Water Resources conceded that 40 % of China’s rivers were seriously polluted in 2011, with 20 percent “too toxic even to come into contact with,” according to Shanghai Daily. Similarly, in 2012, China’s Ministry of Land and Resources released a report showing that 40.3 % of 4,727 monitored wells in 200 Chinese cities had “bad” water quality, and another 14.7 % had “extremely bad” quality. Meanwhile, in Shanghai, a 2013 water census contained the depressing news that only 3.4 % of the city’s water was unpolluted and suitable for drinking or aquaculture.

How did things get so bad? Like China’s more famous air pollution, the country’s water pollution is the inevitable product of a governing agenda that prioritised economic growth and loosened the reins on local governments and state-owned enterprises in order to create it. Unburdened from having to consider the long-term, health-damaging effects of their modes of production, China’s job creators planned recklessly. In Lanzhou, for example, the China National Petroleum Corporation appears to have sited pipelines in close proximity to water supplies (and then failed to take sensible measures when those pipelines ruptured). In a more accountable system of government, a local official or two -- theoretically -- would have pushed back. Under China’s system, those officials knew that they had everything to gain by not interfering with powerful state-owned oil monopolies.

One could hope that the environmental debacle in Lanzhou would be a turning point, and the Chinese public would begin to demand accountability from those who are charged with ensuring the safety of their water. But China has faced too many similar revelations in the past, and each time the situation only seems to worsen. (All the while, the market for bottled water only grows.) To an extent, this is due to the fact that problems like Lanzhou's can take years to become noticeable. Unlike air pollution, there’s no cheap and simple, shut-down-the-factory solution to a benzene spill next to an aquifer. Water pollution is a long-term problem, and it’s likely to persist long after China’s skies have turned blue.

(Adam Minter is a regular contributor to Bloomberg View based in Shanghai and the author of "Junkyard Planet," a book on the global recycling industry. Follow him on Twitter at @AdamMinter.)

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Dryden Aqua have now started working in China with regards to drinking water as well as waste water.  The challenges are considerable however it is essential that China minimises aquatic environmental pollution,  not only for the health of the Chinese people and their environment,  but for the health and well being of everyone. Most chemicals that end up in water will eventually end up in the Oceans, and as marine biologists we know that this is not acceptable.  We all have a moral and ethical obligation to make sure this does not happen.  For more information  go to our presentation of Ocean health and climate change. Click here

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