San Joaquin County, CA Landscaping Rules: Weed Ordinances (2026)
Key Facts
- Authority
- Gov Code §§39560–39588
- Notice Period
- 30–60 days spring
- Lien
- Added to property tax bill
- Noxious Weeds
- Food & Ag Code §5004
- Contact
- SJ Code Enforcement
Summary
San Joaquin County operates an annual weed abatement program under Government Code §§39560–39588. Property owners receive notices in spring; unabated parcels are cleared by county contractors with costs assessed as a lien. Noxious weeds (puncture vine, yellow starthistle, johnsongrass) are separately regulated by the County Agricultural Commissioner under Food & Agricultural Code §5004.
“Noxious weed” means any species of plant that is, or is liable to be, troublesome, aggressive, intrusive, detrimental, or destructive to agriculture, silviculture, or important native species, and difficult to control or eradicate, which the director, by regulation, designates to be a noxious weed. In determining whether or not a species shall be designated a noxious weed for the purposes of protecting silviculture or important native plant species, the director shall not make that designation if the designation will be detrimental to agriculture. (Amended by Stats. 1992, Ch. 556, Sec. 1. Effective January 1, 1993.)
Full Breakdown
San Joaquin County exercises its weed-abatement police power under California Government Code §§39560–39588 and Health & Safety Code §14875. Each spring the County Code Enforcement Division surveys parcels, particularly vacant lots and parcels adjacent to developed areas, and mails abatement notices giving owners 30–60 days to clear dead grass, dry weeds, and combustible rank growth. Parcels that are not abated by the deadline are cleared by county-contracted crews; the cost (plus a 25% administrative charge) is assessed against the property and becomes a lien if unpaid at the next tax bill. The County Agricultural Commissioner separately enforces the California noxious weed program under Food & Agricultural Code §5004, properties found harboring A-rated or B-rated noxious weeds (e.g., puncture vine/Tribulus terrestris, yellow starthistle, red sesbania along the Delta) can be ordered to treat, and the Ag Commissioner may enter and abate. Fire hazard parcels in the eastern foothills have earlier deadlines tied to CAL FIRE defensible space inspections.
Violations & Fines
Notice to abate issued annually. If unabated: county contractor clears at $300–$3,000+ depending on parcel size, plus 25% admin fee. Unpaid charges become a special assessment lien per Gov Code §39574. Noxious weed non-compliance: Ag Commissioner civil penalties up to $1,000 per parcel.
Frequently Asked Questions
What are typical penalties for violating weed ordinances rules?
Sources & Official References
Other rules in San Joaquin County
How San Joaquin County compares: Cities with the Strictest Weed and Property Maintenance Rules·California rules heatmap·Compare San Joaquin County to another location·View the California landscaping rules overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.