30 Tex. Admin. Code § 303.44
Owners of water rights shall promptly inform the executive director of any change of ownership of water rights. Thereafter, if the new ownership record is not complete, the executive director shall inform the alleged owner by letter that ownership documents must be filed within 30 days and approved by the executive director. During a 60-day period following the date of the executive director's letter, the watermaster will honor requests by the alleged owner for releases of water and/or for certification in accordance with the water right. After the 60-day period, no allocations will be made until the executive director notifies the watermaster of the approved change in ownership. Requests for extension of the initial 60-day period must be submitted in writing to the executive director prior to the end of the 60-day period. If the extension is granted, the watermaster may make allocations, issue certifications, and/or order releases for the alleged owner. If the extension is not granted, the watermaster will not issue a certification, make releases, or make allocations for the alleged owner until the executive director notifies the watermaster that ownership has been changed to include the new owner. If a water right amendment is required for the new owner to use water, the watermaster shall not honor requests by the new owner for water under that water right until the amendment has been granted by the commission.
30 Tex. Admin. Code § 303.44