30 Tex. Admin. Code § 321.6
The executive director shall design and issue decals which will be evidence of certification of marine sanitation devices. On a boat registered by the Texas Parks and Wildlife Department under the Water Safety Act, the certification decal shall be prominently displayed three inches following the registration validation decal. On boats unregistered by the Texas Parks and Wildlife Department, the certification decal shall be prominently displayed on the exterior of the forward half of the boat.
Source Note:The provisions of this §321.6 adopted to be effective July 3, 1986, 11 TexReg 2893.