Willmar, Minn., Code of Ordinances ch. 6.5, art. II § 6.5-50

No person shall occupy or let to another for occupancy any rental unit, for the purpose of living therein, which does not comply with the following requirements: (1)
Every foundation, roof, floor, exterior and interior wall, ceiling, inside and outside stair, every porch, and every appurtenance thereto, shall be safe to use and capable of supporting the loads that normal use may cause to be placed thereon and shall be kept in sound condition and good repair. Every inside and outside stair or step shall have uniform risers and uniform treads.
(2) Every foundation, roof and exterior wall, door, skylight and window shall be reasonably weathertight, watertight and dampfree and shall be kept in sound condition and good repair. Floors, interior walls and ceilings shall be sound and in good repair. All exterior wood surfaces, other than decay resistant woods, shall be protected from the elements and decay by paint which is not lead-based paint or by other protective covering or treatment. Walls shall be capable of affording privacy for the occupants. Repainting or other cosmetic repairs may be required when conditions requiring the repair pose a threat to the health or safety of the occupants, or when the structural/physical integrity of the dwelling is adversely affected.
(3) Every premises shall be graded, drained, free of standing groundwater, and maintained in a clean, sanitary and safe condition.
(4) Unless other provisions are made, existing gutters, leaders and downspouts shall be maintained in good working condition as to provide proper drainage of stormwater.
(5) Every window, exterior door and hatchway or similar device shall be so constructed to exclude insects during that portion of the year when there if a need for protection against mosquitoes, flies and other insects.
a. Every doorway used for ventilation and opening directly from a dwelling unit to outside space shall have supplied properly fitting screens with a self-closing device.
b. Every window or other device with openings to outdoor space, used for ventilation, shall be supplied with screens.
(6) Every dwelling, multiple dwelling, roominghouse or accessory structure and the premises on which located shall be maintained in a rat free and ratproof condition.
a. All windows located at or near ground level used or intended to be used for ventilation, all other openings located at or near ground level, and all exterior doorways which might provide an entry for rats shall be supplied with adequate screens or such other devices as will effectively prevent the entrance of rats into the structure.
b. All sewers, pipes, drains or conduits and openings around such pipes and conduits shall be constructed to prevent the ingress or egress of rats to or from a building.
c. Interior floors of basements, cellars and other areas in contact with the soil shall be ratproofed in an approved manner.
d. Materials stored outside the dwelling shall be stacked and elevated so that there will be at least an 18-inch opening between the material and the ground level so at to prevent the creation of a rat harborage area. No stacking or piling of material shall take place against the exterior walls of the structure.
e. Any materials used for ratproofing shall be acceptable to the appropriate authority.
(7) Accessory structures present or provided by the owner, agent or tenant occupant on the premises of a dwelling shall be structurally sound and be maintained in good repair and free of insects and rats, or such structures shall be removed from the premises. The exterior of such structures shall be made weather-resistant through the use of decay-resistant materials or the use of leadfree paint or other preservatives. Repainting or other cosmetic repairs may be required when conditions requiring the repair adversely affect the physical/structural integrity of the accessory structure.
(8) Every plumbing fixture and all water and waste pipes shall be properly installed and maintained in good sanitary working condition.
(9) Every water closet compartment, bathroom and kitchen floor surface shall be constructed and maintained so as to be reasonably impervious to water and so as to permit such floor to be easily kept in a clean and sanitary condition.
(10) Every plumbing fixture and pipe, every chimney, flue and smoke pipe, and every other facility, piece of equipment or utility which is present in a dwelling or dwelling unit, or which is required under this article, shall be constructed and installed in conformance with the appropriate statutes, ordinances and regulations of this city and the state.
(11) No owner, operator, or occupant shall cause any service, facility, equipment or utility which is required under this article to be removed from or shut off from or discontinued for any occupied dwelling or dwelling unit let or occupied by him; except for such temporary interruption as may be necessary while actual repairs or alterations are in process or during temporary emergencies when discontinuance of service is approved by the appropriate authority.
(12) All construction and materials, ways and means of egress and installation and use of equipment shall conform with the appropriate statutes, ordinances and regulations dealing with fire protection of this city and the state (smoke detectors, fire extinguishers, etc.).