9 rules for unincorporated Chester County, Pennsylvania.
Verified from official government sources
Chester County sets no grass-height limit. Overgrown-grass and weed ordinances are enacted by your borough, township, or city under the PA Municipalities Planning Code, with most caps between 6 and 12 inches.
Chester County has no tree-trimming ordinance for private yards. Street ('shade') trees in the public right-of-way are controlled by your borough or township shade tree commission, which requires a permit before major pruning.
Pennsylvania has no statewide tree-removal permit, and Chester County does not require one for private yards. But clearing more than 5,000 square feet of ground triggers a mandatory Conservation District erosion plan, and many Chesco townships have their own tree ordinances.
25 Pa. Code §102.4(b)(2)(i)
A person proposing earth disturbance activities shall develop and implement a written E&S Plan if... the earth disturbance activity will result in a total earth disturbance of 5,000 square feet (464.5 square meters) or more.
Chester County has no county weed ordinance. Noxious-weed and overgrowth nuisance rules are set and enforced by your borough, city, or township, which usually declare tall weeds a public nuisance and order removal.
There are no permanent county watering rules. During a Governor-declared drought emergency, Pennsylvania law bans watering lawns statewide. Your public water utility may also impose its own conservation limits.
4 Pa. Code §119.4
The following nonessential water uses are prohibited... The use of any water for watering of grass, lawns, trees or shrubbery, except newly seeded, sodded or planted areas and except plants which are grown for sale or other commercial purpose.
Rainwater harvesting is legal in Chester County and across Pennsylvania. The state DEP has no permit program for private rain barrels or cisterns used for non-potable uses like watering gardens.
Chester County does not restrict native-plant or meadow landscaping. Native gardens are encouraged countywide, but a municipal weed-height ordinance can still apply, so keep plantings tidy and set back from streets.
Chester County sets no artificial-turf rule. Whether synthetic lawn is allowed, and any stormwater/impervious-surface conditions, is decided by your borough or township zoning and stormwater code.
Backyard composting is legal in Chester County and needs no county permit. The county encourages it through its Solid Waste Authority. Nuisance-style limits (odor, rodents, setbacks) come from your municipality.
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