(a) The quarantined areas are those areas described on the department's website (http://www.TexasAgriculture.gov) as quarantined areas under this subchapter.(b) The department may designate additional or expanded quarantined areas, or a reduction of the quarantined area based upon the confirmation of the presence or absence of the emerald ash borer. The designations will be effective upon the posting of the notification of the quarantined areas on the department's website.