This is the best summary I could come up with:

The so-called Halliburton Loophole, named after the oil and gas services company once headed by former Vice President Dick Cheney, means that the industry can use fracking fluid containing chemicals linked to negative health effects including kidney and liver disease, fertility impairment, and reduced sperm counts without being subject to regulation under the act.

The chemical most frequently reported to the database during that period was ethylene glycol, used by the industry as a friction-reducer and gelling agent, that can harm the eyes, skin, kidneys, and respiratory system and even kill humans if swallowed, according to the federal Centers for Disease Control and Prevention.

Ethylene glycol was disclosed to FracFocus more than 52,000 times, or 45 percent of all disclosures, more than twice as often as any of the other regulated chemicals, during the study period.

The second-most commonly reported fracking chemical subject to the loophole was acrylamide, another friction-reducer, which appeared in 19 percent of the cases notified to the database.

Benzene, which can cause cancer at high or prolonged exposures, was reported only 111 times but had one of the largest weights of the regulated chemicals, at 7.5 million pounds, according to the paper, titled Outcomes of the Halliburton Loophole: Chemicals regulated by the Safe Drinking Water Act in U.S. Fracking Disclosures, 2014-2021.

Other regulated chemicals identified by the study include naphthalene, formaldehyde, and 1,4 dioxane, which are variously linked to negative effects on the nervous, respiratory, urinary, and gastrointestinal systems.

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