The Colorado Oil and Gas Conservation Commission (COGCC) will hold a rulemaking hearing in December to adopt state regulations for disclosure of hydraulic fracturing fluids and chemicals. The Commission voted 5-3 to keep the hearing limited to proposed disclosure regulations, denying a request by representatives of the environmental community to open the rulemaking hearing to a broader array of revisions to the permitting regulations. To date, disclosure of hydraulic fracturing fluid chemicals has been on a voluntary basis, with approximately 35% of the operators in Colorado participating in the FracFocus reporting system developed by the Interstate Oil and Gas Compact Commission (IOGCC) and the Ground Water Protection Council (GWPC). In August, Governor Hickenlooper requested that the COGCC adopt a regulation making public disclosure of hydraulic fracturing chemicals mandatory. The proposed regulation is likely to continue utilizing the FracFocus data base for reporting, along with reporting to the COGCC and incorporation of the data base into the COGCC website materials. The proposed regulation is expected to also be consistent with the recent preliminary report of the Department of Energy Advisory Board which contains recommendations for “best practices.” Companies or industry groups are expected to raise concerns about protection of trade secrets and request revisions in the proposed regulations to ensure maintenance of confidentiality as to protected proprietary information.