Long article. Here is synopsis:

- In 2008, a two-year study found that drinking water with chromium-6 caused cancer in laboratory rats and mice.

- The California scientists set a public health goal of 0.02 parts per billion in tap water, the level that would pose negligible risk over a lifetime of consumption.

- But in 2014, after aggressive lobbying by industry, state regulators adopted a legal limit 500 times the public health goal. It is the only enforceable drinking water standard at either the state or federal level.

- The test data estimates that water supplies serving 218 million Americans – more than two-thirds of the population – contain more chromium-6 than the California scientists deemed safe.

- The article has nice interactive map that lets you check if you are drinking contaminated water (Phoenix is really bad).

- EWG estimates that if left untreated, chromium-6 in tap water will cause more than 12,000 excess cases of cancer by the end of the century.

- The article then describes shenanigans the industry was involved to sabotage raising this public health concern (like retracting a study of a dead scientist), stalling EPA risk assessment, etc. Very entertaining read - worth a movie or a documentary.