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Fire Sprinklers


The County of Sonoma Board of Supervisors approved Sonoma County Fire Safety Ordinance Numbers #5402 (2003), #5373 (2007), #5905 (2010), #6049 (2013), #6184 (2016), #6318 (2020), and #6396 (2022) to require fire sprinklers for both residential and commercial occupancies (with some exceptions).

In July 2022, the Sonoma County Board of Supervisors approved the adoption of the 2022 California Fire Code with amendments. This is known as the Sonoma County Fire Safety Ordnance. For three consecutive code adoption cycles, Sonoma County Fire Agencies got together and completed a county-wide adoption of the 2022 California Fire Code. This included all unincorporated and incorporated areas of the county.

    Codes and Laws

    • NFPA 13, 2022, Commercial Fire Sprinklers.
    • NFPA 20, 2022, Fire Pumps.
    • NFPA 22, 2023, Water Storage Tanks for Fire Protection.
    • NFPA 24, 2022, Fire Protection Underground Systems.


    • NFPA13R, 2022, Residential Multi-Family.
    • NFPA13D, 2022, One and Two Family Dwelling.
    • State Assembly Law Accessory Dwelling Units

    Residential Fire Sprinklers

    The fire sprinkler contractor is to be a licensed C16 contractor. Normally the fire sprinkler contractor submits the required plans and obtains a building permit. Owner builder is allowed to submit sprinkler drawings for the sprinkler contractor.

    The fire sprinkler contractor normally installs the overhead plumbing and sprinkler heads as well as a sprinkler riser consisting of the main shut-off valve, domestic connection if required, check valve, water flow switch, combination drain, and test valve and pressure gauge. This riser is the connection between the underground water supply and the overhead sprinkler plumbing in the building.

    The sprinkler contractor may, but usually will not install the water supply (meter or tank), the required pump, or underground water line from the source to the base of the riser.

    The fire sprinkler contractor will not do the electrical wiring necessary to power the flow switch or alarm devices.

    Underground plumbing, tanks, and pumps may be shown on the plans for reference only. Look for a note/s on the plans stating something similar to the “underground/ pump by others or owner” If you are not sure, contact the contractor for an explanation prior to installation.

    Be aware that smaller pipe sizes (3/4 inch vs. 1 inch) do not necessarily save money. It may require a larger and more costly pump to ensure sufficient water flow.

    The contractor is also required to provide a cabinet containing spare sprinkler heads and an approved wrench to remove or install a sprinkler head, all required signs and labels, instructions on how to test the system monthly, and a set of plans for future reference.

    It is the sprinkler contractor’s responsibility to call for timely inspections and have a representative present at the time of inspection unless otherwise arranged by the sprinkler contractor and the fire inspector.

    If you have a water meter there may be a double check valve on your system. This device reduces the available water flow and pressure. Be sure your contractor accounts for this device in his sprinkler calculations.

    Commercial Fire Sprinklers

    New Construction

    Commercial fire sprinkler systems are designed to NFPA 13 2022 standards. Commercial fire sprinkler systems have many complicated and very specific guidelines to follow. Fire sprinkler design and calculations must be performed by a licensed C16 contractor only with no exceptions. Many times a sprinkler contractor will have a fire protection engineer design the system and provide the drawings to the contractor for submittal to the fire department for review.

    Commercial fire sprinklers are designed for the specific use of the building. Problems occur when a building is designed specifically for an office space and warehouse and then changed to a high pile storage facility. This small change in a facility, which was thought to be a minor change in occupancy, will require a greater water supply for the protection of the commodity being stored. The reason for the increase in the water supply is the fire load. In order for the sprinkler system to meet the needs of any type of occupancy and possible future development, consult with a licensed sprinkler contractor.

    Existing Commercial Buildings

    The expertise of a fire sprinkler contractor or a fire protection consultant may be needed for existing buildings. Existing buildings may have been designed for a specific type of hazard. A change of hazard, which would result in the building being more hazardous than the previous occupancy, may require major upgrades to the fire sprinkler system. This could include underground and above-ground piping, fire pump, and sprinkler head type.

    Fire Sprinklers are required after 50 years of service to be tested or replaced. Fire Sprinkler Systems are required to be re-certified every five (5) years. Existing buildings may be required to provide proof of the above before a final inspection would be performed.