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Division D — Emergency Water Supply.

Sec. 13-52. - Hydrants.

Sonoma County Municipal Code · 2026-09 edition · updated 2026-09-27 · Sonoma County

(a)

All buildings shall be protected by hydrants. The location, number, and type of hydrants for any building shall be as required and approved by the county fire warden/fire marshal or the director of permit and resource management.

(b)

All hydrants for non-urban parcels shall comply with the following requirements:

(1)

Hydrant outlets shall be a minimum of eighteen inches (18") and a maximum of twenty-four inches (24") above grade, eight feet (8') from flammable vegetation, no closer than six feet (6') nor farther than twelve feet (12') from the edge of the road or driveway, and in a location where emergency fire equipment using it will not block the road. The hydrant serving any residential building shall be located at a turnout or turnaround, along the driveway to the building, or along the road that intersects with the driveway. The hydrant serving any residential building shall be connected to the emergency water supply by an approved minimum four inch (4") diameter water line.

(2)

All hydrants shall be located between sixty feet (60') and one hundred fifty feet (150') from the residential building. The fire hydrant shall be installed so that a fire engine utilizing the hydrant may maintain a minimum distance of sixty feet (60') from the residential building. Distance measurements shall be determined by hose lay along a road or driveway, not horizontal distance.

Exceptions:

The distance to the hydrant, on a non-urban parcel with exclusively residential buildings on it, may exceed one hundred fifty feet (150') by one hundred fifty feet (150') for each additional five hundred (500) gallons of water storage capacity up to a maximum of two thousand five hundred and fifty feet (2,550') from the residential building as allowed by Table 13-52a.

a.

All hydrants shall have at least one (1) two and one-half-inch outlet with male National Hose Threads and a cap. On water systems of greater than ten thousand five hundred (10,500) gallons, there shall also be at least one (1) four and one-half-inch outlet with male National Hose Threads and a four and one-half-inch by two and one-half-inch reducer with a cap.

b.

All hydrants shall be a wet barrel hydrant or a draft hydrant as required by the delivery system and shall have suitable crash protection. The maximum height differential between the water source and the draft hydrant outlet shall be ten feet (10'). Draft hydrants shall be supplied by six inch (6") minimum pipe size, and be equipped with a four and one-half-inch National Hose male thread fitting with a cap.

c.

Crash protection shall be per California Fire Code, Chapter Three, Section 312.

A public fire hydrant can be used for the emergency water supply as allowed by Table 13-52b, for non-urban parcels with exclusively residential buildings on them.

Table 13-52a 1 Distance to hydrants based on volume of storage

Distance is from structure to hydrant

Gallons of Storage/Distance to Hydrant

2,500/150' 7,000/1,500'

3,000/300' 7,500/1,650'

3,500/450' 8,000/1,800'

4,000/600' 8,500/1,950'

4,500/750' 9,000/2,100'

5,000/900' 9,500/2,250'

5,500/1,050' 10,000/2,400'

6,000/1,200' 10,500/2,550'

6,500/1,350'

Note:

1 This table applies only to parcels that have exclusively residential buildings on them.

Table 13-52b (1) Exception to hydrant distance(2)

Distance is measured from driveway entrance to the public hydrant

Road Flow Rate Minimum Distance Residual Pressure

1 Mile 500 GPM 20 PSI

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