8 rules for unincorporated Champaign County, Illinois.
Verified from official government sources
Champaign caps lawn grass at eight inches; taller triggers a code-compliance notice and city mowing billed to the owner. Urbana, Rantoul, and the county's unincorporated townships run parallel weed-and-rank-vegetation nuisance rules across this prairie farm county.
Prune trees on your own Champaign County lot without a permit, but parkway and street trees belong to the city. Urbana's Arbor Division and Champaign's Forestry Section manage public trees, and residents may not top or remove them.
Removing a tree in your own Champaign County yard needs no city or county permit. Champaign and Urbana regulate the public parkway trees they own and require tree preservation on development sites, but private homeowners may fell their own trees.
Beyond mowing height, Illinois law makes controlling noxious weeds a legal duty. The Illinois Noxious Weed Law requires every owner across Champaign County to eradicate listed species like Canada thistle, giving cities and the county authority to abate and lien.
505 ILCS 100/3
Every person shall control the spread of and eradicate noxious weeds on lands owned or controlled by him and use such methods for that purpose and at such times as are approved and adopted by the Director of the Department of Agriculture.
No Illinois statute rations lawn watering, and Champaign-Urbana draws abundant water from the deep Mahomet Aquifer through Illinois American Water. Outdoor watering is normally unrestricted; the utility, not the county, would set any limits in a rare drought.
Collecting rooftop rainwater is legal across Champaign County. Illinois places no meaningful limit on residential rain barrels and cisterns for garden use, and rain barrels are common in Urbana and Champaign. Systems plumbed indoors must meet the Illinois Plumbing Code.
Native prairie landscaping is well accepted here. Since July 2024, Illinois' Homeowners' Native Landscaping Act bars HOAs from prohibiting native-species yards, and Champaign's code allows non-turf parkway plantings to 24 inches, so a maintained prairie garden is legal, not a violation.
765 ILCS 167/10(a)
An Association shall not prohibit any resident or owner from planting or growing Illinois native species on the resident's or owner's lawn so long as the area is maintained predominantly free of weeds, invasive species, and trash, and vegetation does not extend over or onto neighboring properties, public or common sidewalks, pathways, streets or other public or common areas or elements, and doe...
Champaign County and its cities do not regulate artificial turf on an existing residential lot, so a homeowner may install it. It is uncommon in this rain-fed prairie climate where natural lawns thrive. HOA covenants are the main limit.
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