16 Tex. Admin. Code § 76.71
Each well driller or installer shall, within twenty-four (24) hours of becoming aware of the existence of injurious water or constituents, inform the landowner or person having a well drilled, deepened, or otherwise altered. The well driller or installer shall, within thirty (30) days of becoming aware of the existence of injurious water or constituents transmit electronically through the Texas Well Report Submission and Retrieval System or deliver or send by certified mail, the original of the Injurious Water or Constituents Report to the department. The well driller or installer shall also deliver or send by first-class mail a copy of the Injurious Water or Constituents Report to the groundwater conservation district in which the well is located, if any, and the landowner or person having the well drilled, deepened, or altered.
16 Tex. Admin. Code § 76.71