Ontario, CA Public Health Rules: Rodent Control (2026)
Key Facts
- Enforcing office
- Code Enforcement Director
- Violation class
- Infraction
- Hearing request window
- 10 days after notice
- Cost recovery
- Lien or special assessment
- Repeat violation penalty
- Treble abatement costs, 2-year window
Summary
Ontario, California code enforcement treats overgrown vegetation that is likely to harbor rats, vermin and other vectors as a public nuisance on any premises. The Code Enforcement Director can order abatement, and owners who ignore a Notice of Violation face an infraction charge and City cleanup billed back to the property.
It is a public nuisance for any person owning, leasing, occupying or having charge of any premises in this City to maintain such premises in such manner that any of the following conditions are found to exist thereon: ... (f) Overgrown vegetation: (1) Likely to harbor rats, vermin and other vectors;
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-32: Current through Ordinance 3338, passed 7-21-2026).
Full Breakdown
Ontario Municipal Code Sec. 02(f)(1), in Chapter 22 (Property Appearance - Nuisance), makes it a public nuisance for any owner, lessee or occupant to maintain premises with overgrown vegetation likely to harbor rats, vermin and other vectors. This sits alongside other maintained-property nuisances in the same section, but the rodent-harborage clause stands on its own regardless of whether the vegetation is otherwise unsightly. Under Sec. 04, the Code Enforcement Director serves a Notice of Violation listing the nuisance conditions, sets a reasonable abatement deadline, and advises the owner of the right to a hearing under Sec.
05, which must be granted if requested within 10 days of mailing. If the owner does not fully abate within the deadline, City forces or a private contractor can enter the property and clear it, with the itemized cost of abatement, including inspection and attorneys' fees, served on the owner under Sec. 06. Unpaid costs become either a lien on the property under Cal. 5, collected the same way as delinquent City taxes. If the violation is not corrected by the deadline, the City may also record the Notice of Violation against the property with the County Recorder.
Violations & Fines
Maintaining the nuisance or ignoring a Notice of Violation is an infraction under Sec. 5-22.08(a). A second or subsequent civil or criminal judgment against the same owner within a two-year period triggers treble abatement costs under Sec. 5-22.08(f). Obstructing City personnel carrying out abatement is a separate infraction, and a prevailing party in an abatement action can recover attorneys' fees and costs.
Frequently Asked Questions
What vegetation condition counts as a rodent nuisance in Ontario?
What happens if I ignore a Notice of Violation for overgrown vegetation?
Can I contest a rodent-harborage nuisance citation?
Is a rodent-harborage violation a criminal charge?
Sources & Official References
Other rules in Ontario
California rules heatmap·Compare Ontario to another location·View the California public health rules overview
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