This analysis compares state hydraulic fracturing disclosure rules that: 1) require some identification of the substances used in hydraulic fracturing for oil and gas; and 2) make records available to the public online without a public records request. Fourteen states require some level of public hydraulic fracturing disclosure as of the date of publication.2 However, there is hydraulic fracturing activity in at least twenty-nine states. More than half of the states with hydraulic fracturing activity currently have no disclosure requirements at all. Of the existing state rules, none provide comprehensive disclosure. Enforcement of state rules is also found to be uneven.