N.Y. Comp. Codes R. & Regs. tit. 21, § 1806.4
(a) Except for activities relating to site evaluation, to aquifer testing under section 1806.12 of this Part or to those activities authorized under section 1806.34 of this Part, no person shall undertake any of the following projects without prior review and approval by the commission. The project sponsor shall submit an application in accordance with subpart B of this part and shall be subject to the applicable standards in subpart C of this part.
(1) Consumptive use of water. Any consumptive use project described in this paragraph shall require an application to be submitted in accordance with section 1806.13 of this Part, and shall be subject to the standards set forth in section 1806.22 of this Part, and, to the extent that it involves a withdrawal from groundwater or surface water except a small capacity source, shall also be subject to the standards set forth in section 1806.23 of this Part as the commission deems necessary. Except to the extent that they involve the diversion of the waters of the basin, public water supplies shall be exempt from the requirements of this section regarding consumptive use; provided, however, that nothing in this section shall be construed to exempt individual consumptive users connected to any such public water supply from the requirements of this section. Provided the commission determines that low flow augmentation projects sponsored by the commission's member states provide sufficient mitigation for agricultural water use to meet the standards set forth in section 1806.22 of this Part, and except as otherwise provided in this paragraph, agricultural water use projects shall not be subject to the requirements of this paragraph. Notwithstanding the foregoing, an agricultural water use project involving a diversion of the waters of the basin shall be subject to such requirements unless the property, or contiguous parcels of property, upon which the agricultural water use project occurs is located at least partially within the basin.
(iii) With respect to projects with pre-compact consumptive use:
(2) Withdrawals. Any project, including all of its sources, described in this paragraph shall require an application to be submitted in accordance with section 1806.13 of this Part, and shall be subject to the standards set forth in sections 1806.21 and 1806.23 of this Part. Hydroelectric projects, except to the extent that such projects involve a withdrawal, shall be exempt from the requirements of this section regarding withdrawals; provided, however, that nothing in this paragraph shall be construed as exempting hydroelectric projects from review and approval under any other category of project requiring review and approval as set forth in this section, section 1806.5 of this Part, or 18 CFR part 801.
(iv) With respect to projects with grandfathered withdrawals:
(3) Diversions. Except with respect to agricultural water use projects not subject to the requirements of paragraph (1) of this subdivision, the projects described in subparagraphs (i)-(iv) of this paragraph shall require an application to be submitted in accordance with section 1806.13 of this Part, and shall be subject to the standards set forth in section 1806.24 of this Part. The project sponsors of out-of-basin diversions shall also comply with all applicable requirements of this Part relating to consumptive uses and withdrawals. The projects identified in subparagraphs (v) and (vi) of this paragraph shall be subject to regulation pursuant to section 1806.22(f) of this Part.
(b) Any project that did not require commission approval prior to January 1, 2007, and undergoing a change of ownership, shall be exempt from the requirements of subparagraph (a)(1)(iv), (2)(v) or (3)(iv) of this section if it is a: