8 county-level rules, plus city-specific rules for 1 city in Johnson County, Iowa.
Verified from official government sources
Each Johnson County city sets its own limit. Iowa City and Coralville both cap grass and weeds at 10 inches and mow neglected lots at the owner's expense. Unincorporated areas fall under the county nuisance ordinance instead.
No Iowa statute or Johnson County ordinance limits trimming trees on your own land, so you may prune freely. Iowa City's Forestry Division controls only the public right-of-way trees in the strip between the sidewalk and the street.
You may remove trees on your own property anywhere in Johnson County without a county permit. Iowa has no statewide tree law. Only the cities' public right-of-way trees, like Iowa City's, are off-limits to residents.
Two layers apply. Statewide, Iowa Code Chapter 317 makes every landowner destroy noxious weeds like Canada thistle and Palmer amaranth, enforced by the Johnson County weed commissioner. Locally, each city's ordinance abates overgrown lots at the owner's expense.
Iowa Code §317.10
Each owner and each person in the possession or control of any lands shall cut, burn, or otherwise destroy, in whatever manner may be prescribed by the board of supervisors, all noxious weeds thereon as defined in this chapter at such times in each year and in such manner as shall be prescribed in the program of weed destruction order or orders made by the board of supervisors, and shall keep s...
The Iowa River valley is water-abundant, so Johnson County keeps no fixed watering schedule and Iowa sets no statewide ban. Any limits are occasional, set by your water utility during a drought, not a permanent odd-even rule.
Rainwater harvesting is legal and unregulated across Johnson County. Iowa places no limit on collecting rain, and neither the county nor its cities restrict rain barrels or cisterns for garden and lawn use.
No Iowa statute or Johnson County ordinance restricts native or prairie planting. You may replace lawn with tallgrass prairie, pollinator beds, or a naturalized yard, a look Iowa City actively embraces. HOA covenants are the main limit.
No Iowa statute or Johnson County ordinance governs artificial turf. In unincorporated areas and most yards you may install it freely. HOA covenants are the main limit, and low-lying lots near the Iowa River may face drainage review.
1 cities in Johnson County have their own landscaping rules rules. Each link goes to that city's dedicated page with code citations.
See every category we cover for Johnson County — parking, noise, fences, fires, animals, pools, and more.
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