In May 2007, the Ontario City Council enacted an ordinance which reaffirmed existing Ontario Municipal Codes prohibiting fireworks and declared fireworks within the City of Ontario a nuisance, carrying a $1,000 fine. This fine is in addition to any other civil penalty, criminal prosecution or fine. Ontario revised the ordinance in October 2015 to include:
- Holding residential property owners responsible for violations occurring on their property;
- Holding parents and legal guardians responsible for any violations of the code by a minor;