Contra Costa County Fire Department held a controlled demonstration on Thursday to warn everyone that even what's considered 'safe and sane' fireworks, like sparklers, are illegal.
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"It spreads beyond what you can control with a garden hose at your house or what you can control with a bucket," said Aaron McAlister, Deputy Fire Chief for the Contra Costa County.
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And for the third year, they're relying on their residents to report illegal fireworks to a toll-free tip line at 1-833-885-2021.
Those caught with them, could be fined up to $1,000.
But in Oakland, the police department says they did not issue a single citation for illegal fireworks last year on the Fourth of July.
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Instead, police say their resources were shifted to address heavy illegal sideshow activity that night.
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As for unincorporated Alameda County, the crackdown on fireworks has already begun.
The sheriff's office seizing nearly 300 pounds of fireworks earlier this week, while conducting compliance checks, which resulted in 14 searches.
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And while they say they plan to have teams of investigators on top of patrol staff out in neighborhoods looking for illegal fireworks and responding to tip-line reports, they want folks to understand that they still have other priorities.
"We're experiencing a lot of crime in Alameda County and not just in our county, we're just seeing an uptick in violent crimes in the state of California so those calls will be prioritized based on the seriousness of other calls," said Lt. Tya Modeste, a spokesperson for the Alameda County Sheriff's Office.
4th of July events: List of Bay Area fireworks shows, festivals