Filing requirements are per state statute.
Candidates must:
Be a United States citizen,
Be 18 years of age upon the commencement of the term to be filled at the election,
Have been a resident of Texas for at least 12 months as of the deadline for filing for the office,
Have resided in the city for at least 6 months as of the deadline for filing for the office,
Not have been convicted of a felony for which he or she has not been pardoned or otherwise released from the resulting disabilities,
Not have been found mentally incompetent by a final judgment of a court.