Section 6617. Notice of assessment; assessment corporations

(a) It shall be
  the  duty  of the secretary of every assessment corporation, whenever an
  assessment shall have  been  made  by  it,  to  notify,  not  more  than
  forty-five  days  thereafter,  every  person to which such assessment is
  applicable.
    (b) Such notice may be given personally, by an agent, or by a  written
  or  printed  notice mailed, postage prepaid, to such person's last known
  post office address, and shall state the purpose of the assessment,  the
  sum  due from such person, and the time when and to whom payment thereof
  is to be made; but such time shall not be more than ninety days from the
  date of such notice.