Willmar, Minn., Code of Ordinances ch. 6.5, art. II § 6.5-70

(a) Whenever the appropriate authority determines that any rental dwelling or dwelling unit, rooming unit or the premises surrounding any of these fails to meet the requirements set forth in this article or in applicable rules and regulations issued pursuant thereto, the appropriate authority in accordance with existing legislation shall issue a notice setting forth the alleged failures and advising the owner, occupant, operator or agent that such failures must be corrected. This notice shall:
(1) Be in writing.
(2) Set forth the alleged violations of this article or of applicable rules and regulations issued pursuant thereto.
(3) Describe the dwelling, dwelling unit or rooming unit where the violations are alleged to exist or to have been committed. Such written notice shall specify an appropriate or acceptable method of correction.
(4) Specify a specific date for the correction of any violation alleged.
(5) Be served upon:
a. The owner, occupant, operator or agent of the dwelling, dwelling unit or rooming unit personally or by registered mail, return receipt requested, addressed to the owner, occupant, operator or agent. If one or more persons to whom such notice is addressed cannot be found after diligent effort to do so, service may be made upon such persons by posting the notice in or about the dwelling, dwelling unit or rooming unit described in the notice, or by causing such notice to be published in a newspaper of general circulation once each week for a period of three successive weeks;
b. A resident agent for the receipt of such services of notices designated pursuant to section 6.5-69 (h); or
c. The appropriate authority where he has been designated agent for such service pursuant to section 6.5-69 (g).
(b) At the end of the period of time allowed for the correction of any violation alleged, the appropriate authority shall reinspect the dwelling, dwelling unit or rooming unit described in the notice.
(c) If upon reinspection the violations are determined by the appropriate authority not to have been corrected, the appropriate authority shall initiate legal proceedings for the immediate correction of the alleged violations or shall order the dwelling, dwelling unit or rooming unit vacated within 30 days or both.