Landscaping Rules in Orange County, CA (2026)

5 county-level rules, plus city-specific rules for 10 cities in Orange County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Orange County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Tree Trimming

For ordinary trees on private property in unincorporated Orange County, routine pruning needs no county permit. The County's fire program may require trimming branches within 10 feet of a roof, chimney, or stovepipe. A draft native-tree rule, if applied, would treat excessive pruning of protected trees as damage.

Orange County Tree Trimming

Some Restrictions

California Public Resources Code § 4291

(2) Remove that portion of a tree that extends within 10 feet of the outlet of a chimney or stovepipe. (3) Maintain a tree, shrub, or other plant adjacent to or overhanging a building free of dead or dying wood. (4) Maintain the roof of a structure free of leaves, needles, or other vegetative materials. (5) Before constructing a new building or structure or rebuilding a building or structure...

Full ordinance details →Official source ↗

Weed Ordinances

In unincorporated Orange County, any weeds on a parkway, sidewalk, or private lot are a declared public nuisance under county code: there's no minimum height that triggers it, unlike many cities' inch-based rules.

Orange County Bans Weeds With No Height Threshold

Some Restrictions

Orange County Codified Ordinances § 3-13-3

(d)Weeds. The presence of weeds growing upon any parkway, sidewalk or on private property within county territory, is hereby declared to constitute a public nuisance.

Full ordinance details →Official source ↗

Water Restrictions

Unincorporated Orange County does not set a single countywide watering schedule; outdoor water rules are set by each retail water district (coordinated through MWDOC) plus statewide law. California permanently prohibits wasteful practices like runoff, hosing pavement, and using non-recirculating fountains under State Water Board rules.

Orange County Outdoor Water Use Restrictions

Heavy Restrictions

California Department of Water Resources — Model Water Efficient Landscape Ordinance (MWELO), Cal. Code Regs. tit. 23 § 490 et seq.

New development and retrofitted landscape water efficiency standards are governed by the Model Water Efficient Landscape Ordinance (MWELO) . The MWELO is also referenced by Title 24, Part 11, Chapters 4 and 5 CalGreen Building Code. All local agencies must adopt, implement, and enforce the MWELO or a local Water Efficient Landscape Ordinance (WELO) that is at least as effective as the MWELO. Us...

Full ordinance details →Official source ↗

Rainwater Harvesting

Unincorporated Orange County exempts landscape projects that meet their entire water demand with on-site rainwater capture or graywater from the standard water-budget calculation, letting them follow simplified prescriptive Appendix A rules instead.

Orange County Rainwater Capture Landscape Exemption

Few Restrictions

Orange County Codified Ordinances § 7-9-68.2(a)(4)

(4)New or rehabilitated projects using treated or untreated graywater or rainwater capture on site, any lot or parcels within the project that has less than two thousand five hundred (2,500) square feet of landscape area and meets the lot or parcel's landscape water requirement (Estimated Total Water Use) entirely with the treated or untreated graywater or though stored rainwater capture on sit...

Full ordinance details →Official source ↗

Composting

Unincorporated Orange County lets residents compost fruit and vegetable garden waste at home, but Section 7-9-102 requires compost piles be screened from neighboring properties, controlled for odor and pests, and ventilated to prevent fire hazards.

Orange County Backyard Composting Rules

Some Restrictions

Orange County Codified Ordinances § 7-9-102

Compost materials shall be contained in a manner that is not visible from the adjacent property, limits odor, prevents infestation, and meets state water quality/runoff management requirements while ensuring proper ventilation to prevent any fire hazards.

Full ordinance details →Official source ↗