Fire Regulations in Jefferson County, MO (2026)

2 rules for unincorporated Jefferson County, Missouri.

Verified from official government sources

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

Fireworks

Jefferson County prohibits all fireworks inside its county park system. Section 240.080(Q) states flatly that fireworks are prohibited in County parks, with no exception carved out for holidays, permits or supervised displays, and the Parks Department and Sheriff's Office enforce it alongside the chapter's other open-flame and weapons restrictions.

Jefferson County, MO Bans Fireworks in County Parks

Heavy Restrictions

Jefferson County, MO Code of Ordinances § 240.080(Q)

Use Of Fireworks Prohibited. All fireworks shall be prohibited in County parks.

Full ordinance details →Official source ↗

Smoke Detectors

Smoke alarms in Jefferson County homes must be hardwired to 120-volt AC power with battery backup whenever the building has commercial electric service, under the county's amendment to IRC Section R314.6. Only homes without commercial power, or alarms installed under the code's remodel exception, may run on batteries alone.

Jefferson County Smoke Alarm Power Source

Some Restrictions

Jefferson County, MO Code of Ordinances § 500.400 (amending IRC § R314.6)

R314.6. Delete and insert in lieu thereof the following: Power Source. Smoke alarms shall receive 120V/AC from the building wiring where such wiring is served from a commercial source and, where primary power is interrupted, shall receive power from a battery. Wiring shall be permanent and without a disconnecting switch other than those required for overcurrent protection. Exceptions: 1. Smoke ...

Full ordinance details →Official source ↗

All Jefferson County ordinances

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