7.1 Site Sanitation, Grading, Drainage, and Accessory Structures

7.1 Site Sanitation, Grading, Drainage, and Accessory Structures

Exterior Premises and Public Welfare

Property maintenance begins at the property line. Under Chapter 3 of the International Property Maintenance Code (IPMC), the exterior of a premises must be maintained in a clean, safe, and sanitary condition. Neglected exterior areas not only create public health hazards but also contribute to neighborhood blight, which depresses property values, encourages vandalism, and undermines community safety. Code officials enforce exterior maintenance standards to ensure that public health, safety, and welfare are protected from the outset.

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Site Sanitation (IPMC 302.1)

The exterior property and premises must be kept free from any accumulation of rubbish or garbage. This requirement is fundamental to preventing environmental contamination, fire hazards, and vector-borne diseases.

Rubbish vs. Garbage

For enforcement purposes, inspectors must distinguish between rubbish and garbage:

• Rubbish: Combustible and noncombustible waste materials, excluding garbage. Combustible rubbish includes paper, rags, cartons, wood, excelsior, rubber, leather, tree branches, and yard trimmings. Noncombustible rubbish includes metals, tin cans, glass, crockery, and mineral waste.
• Garbage: Animal and vegetable waste resulting from the handling, preparation, cooking, and consumption of food. Garbage is highly putrescible (prone to rapid decay and odor generation) and attracts pests.

Outdoor Storage Prohibitions

Exterior premises must not be used for the storage of materials intended for indoor use. This includes upholstered indoor furniture, vehicle parts, construction debris, scrap metal, and discarded household appliances (refrigerators, stoves, washers, dryers). Discarded refrigerators and freezers with latching doors present an extreme safety hazard for children who might crawl inside and become trapped; these must have their doors removed or be hauled away immediately.

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Grading and Drainage (IPMC 302.2)

Improper grading and drainage can cause catastrophic structural failure and major public health issues. The IPMC requires all premises to be graded and maintained to prevent soil erosion and the accumulation of stagnant water on the site or within any structure.

Water Accumulation and Structural Hazards

Standing water next to a building can lead to hydrostatic pressure. As water saturates the soil around a foundation, it exerts immense physical pressure against the foundation walls. This pressure causes foundation walls to bow, crack, and leak. Over time, water intrusion weakens concrete or masonry, causing structural settlement and floor slab heaving.

Vector and Environmental Hazards

Ponding water creates breeding grounds for mosquitoes and other disease-carrying insects. The code official must ensure that stagnant pools of water are eliminated. Exception: Approved retention areas, detention basins, or decorative reservoirs are permitted, provided they are engineered and maintained to prevent stagnation and pest breeding.

Roof Drainage and Discharges

Roof drainage systems—including gutters, downspouts, scuppers, and splash blocks—must be kept in good repair and free of obstructions. They must discharge water away from the building foundation. Crucially, roof drainage must not discharge in a manner that creates a public nuisance. Directing downspouts onto adjacent private properties without a recorded easement, or onto public sidewalks where the water can freeze and create slipping hazards in winter, is a direct violation.

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Sidewalks, Driveways, and Walking Surfaces (IPMC 302.3)

All sidewalks, driveways, parking spaces, walkways, and stairs must be kept in a proper state of repair and maintained free of hazardous conditions.

Crack and Displacement Tolerances

Over time, weather cycles, tree roots, and soil settling cause concrete slabs to crack, tilt, or heave. During inspections, the code official must evaluate these defects for safety:

• Tripping Hazards: A vertical displacement (offset or lip) of 0.5 inches (1/2 inch) or more between adjacent concrete slabs in a sidewalk, walkway, or stair tread is a hazard that must be cited.
• Spalling and Potholes: Deteriorating concrete that is crumbling (spalling) or has deep potholes must be repaired.
• Vegetation Encroachment: Grass or weeds growing through cracks must not grow to a height that obscures the walking surface or causes further pavement displacement.

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Weeds and Plant Growth (IPMC 302.4)

Overgrown vegetation is a primary indicator of property neglect and presents severe fire and pest hazards. All premises and exterior property must be maintained free from weeds or plant growth in excess of the jurisdictionally established height limit.

Definitions and Limits

• Weeds: Defined as all grasses, annual plants, and vegetation other than trees or shrubs. This definition excludes cultivated flowers, agricultural crops, and managed vegetable gardens.
• Height Thresholds: The specific height limit is set by the local jurisdiction when adopting the IPMC. Typically, this limit ranges from 10 to 12 inches, though some jurisdictions enforce stricter limits (e.g., 8 inches).
• Noxious Weeds: Regardless of height, noxious weeds (such as poison ivy, poison oak, ragweed, or invasive species designated by state or local agricultural departments) are strictly prohibited.

Enforcement and Abatement

When weeds exceed the height limit, the code official issues a notice of violation. If the owner fails to cut the weeds within the specified time, the code official is authorized to enter the property and have the weeds cut. The costs incurred by the jurisdiction for this abatement are billed to the owner and, if unpaid, are recorded as a tax lien against the property.

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Rodent Harborage (IPMC 302.5)

Exterior property must be kept free of rodent harborage to prevent vermin infestations from migrating into habitable structures.

Identifying and Eliminating Harborage

Rodents require food, water, and shelter (harborage) to survive. Common harborage sites include:

• Uncut weeds and high grass.
• Piles of rubbish, construction debris, or junk.
• Improperly stored lumber or firewood.

To prevent rodent nesting, the code requires that:

• Exterior spaces be kept clean and clear of junk.
• Firewood, lumber, and other building materials must be neatly stacked and elevated off the ground by at least 18 inches. This elevation removes the dark, narrow voids between the ground and the pile where rodents nest.
• Any existing infestations must be abated through approved extermination processes that do not pose a health risk to humans or pets.

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Accessory Structures (IPMC 302.7)

Accessory structures must be maintained in good repair and structurally sound to prevent safety hazards and aesthetic blight. This applies to detached garages, sheds, playhouses, carports, retaining walls, fences, and swimming pools.

Fences and Retaining Walls

• Fences: Must be maintained plumb, stable, and free from decay. Rotting wooden posts, missing or loose pickets, rusted chain-link, and peeling protective coatings (paint/stain) must be repaired. Fences must be capable of resisting wind loads.
• Retaining Walls: Retaining walls hold back soil pressure. Inspectors must look for bowing, cracking, or tilting forward, which are signs of structural failure. Retaining walls must be rebuilt or reinforced if they pose a threat of collapse.

Decks and Balconies

Decks attached to detached garages or accessory structures must follow strict structural rules. Inspectors must verify that the deck ledger board is properly bolted to the structure rather than nailed, and that joist hangers and post-to-footing connectors are secure.

Swimming Pools, Spas, and Hot Tubs (IPMC 303)

Swimming pools represent a unique safety hazard, particularly for drowning prevention:

• Sanitation: Pool water must be kept clean, clear, and chlorinated to prevent algae growth and insect breeding.
• Safety Barriers: Every outdoor swimming pool, spa, or hot tub must be surrounded by a barrier (fence or wall) that is a minimum of 48 inches (4 feet) in height above the exterior grade.
• Barrier Openings: The vertical clearance between the grade and the bottom of the barrier must not exceed 2 inches. Openings in the barrier must not allow a 4-inch sphere to pass through (to prevent children from squeezing through).
• Access Gates: Gates in the barrier must open outward (away from the pool), be self-closing, and be equipped with a self-latching device. If the latch handle is located less than 54 inches from the bottom of the gate, it must be on the pool side of the gate, at least 3 inches below the top of the gate, and the gate/barrier must have no openings larger than 0.5 inches within 18 inches of the latch.

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Motor Vehicles (IPMC 302.8)

The outdoor storage of inoperable or unlicensed motor vehicles is a significant source of blight and environmental contamination.

Definitions and Storage Rules

• Inoperable Vehicle: A vehicle that cannot be driven on public streets due to being wrecked, disassembled, missing key mechanical parts (wheels, engine, transmission), or lacking a current license plate and registration.
• Prohibition: Inoperable or unlicensed vehicles must not be parked, kept, or stored on any premises.
• Enclosed Storage Exception: Inoperable vehicles may be kept on a property only if stored inside a fully enclosed structure (like a garage) approved for that purpose.
• Repair Work: Minor vehicle maintenance is allowed outside, but major overhaul work (such as engine rebuilding or body work) must be performed inside an approved structure.

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Defacement of Property (IPMC 302.9)

Defacement of property, such as graffiti, must be promptly removed by the owner. The code mandates that any defacing marks be restored to an approved state to maintain neighborhood aesthetics and prevent further vandalism.