Texas Government Code - GOV'T § 2001.036. Effective Date of Rules; Effect of Filing with Secretary of State

(1) if a later date is required by statute or specified in the rule, the later date is the effective date;

(2) if a state agency finds that an expedited effective date is necessary because of imminent peril to the public health, safety, or welfare, and subject to applicable constitutional or statutory provisions, a rule is effective immediately on filing with the secretary of state, or on a stated date less than 20 days after the filing date; and

(3) if a federal statute or regulation requires that a state agency implement a rule by a certain date, the rule is effective on the prescribed date.