Grays Harbor County, WA Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- Exemption threshold
- Under 5,000 sq ft fire area
- Sprinkler credit
- NFPA 13-D system, full fire-flow credit
- Other buildings, engineer-designed system
- Up to 50% flow reduction
- Supervised system (WSRB-reviewed)
- Up to 75% flow reduction
- Civil penalty
- Up to $1,000 per day
- Criminal penalty
- Misdemeanor, up to 90 days jail
- Appeals body
- Building Codes Advisory Council
Summary
Grays Harbor County has no residential fire sprinkler mandate. One- and two-family dwellings under 5,000 square feet of fire area are exempt from the county's whole fire-flow chapter, and larger homes can trade a full fire-flow credit for an NFPA 13-D sprinkler system instead of added hydrant capacity.
B.Minimum Fire Flow. The following contains the minimum fire flow requirements for individual structures:1.The minimum fire flow requirement for one- and two-family dwellings greater than five thousand square feet in fire area shall be in accordance with Table A of this chapter. ... Exception: The one- and two-family dwelling may be granted a full fire flow requirement credit by installing a National Fire Protection Association 13-D sprinkler system.
Full Breakdown
Grays Harbor County Code Chapter 13.04 sets minimum fire flow, not a sprinkler mandate. Under § 13.04.040(A)(6), one- and two-family dwellings and mobile homes, including attached garages and covered porches, are exempt from the hydrant, water main, and fire-flow requirements of the chapter entirely if the fire area is less than 5,000 square feet; the same exemption covers detached garages and accessory buildings under 5,000 square feet. Once a house crosses that line, § 13.04.070(B)(1) applies Table A's minimum fire flow, which for a Type V-B wood-frame home starts at 1,600 gallons per minute for thirty minutes and climbs with floor area.
The exception in that same subsection lets the owner install a National Fire Protection Association 13-D residential sprinkler system and receive a full fire-flow requirement credit, eliminating the need to size up the hydrant main or add a second hydrant. Section 13.04.070(C)(2) extends similar relief to other buildings: a licensed fire-protection engineer's automatic sprinkler system earns up to a 50 percent fire-flow reduction, and a fully supervised system reviewed by the Washington Survey and Rating Bureau earns up to 75 percent. The Planning and Building Division's fire code official administers the chapter, and appeals of any director decision go to the Building Codes Advisory Council under § 13.04.100.
In no case may the resulting fire flow fall below the floor set by WAC 246-293: 500 gallons per minute for thirty minutes for residential lots under one acre.
Violations & Fines
Violating Chapter 13.04, including installing water mains or hydrants without director-approved plans, exposes the property owner to a civil penalty of up to $1,000 per day under § 13.04.090. The same section also makes a violation a misdemeanor, punishable on conviction by a fine of up to $1,000 per day, imprisonment for up to 90 days, or both, enforced by the fire code official within Planning and Building.
Frequently Asked Questions
Does Grays Harbor County require sprinklers in new houses?
What size triggers the county's fire-flow rule for a house?
Can a sprinkler system replace a required fire hydrant?
Who enforces the fire-flow chapter and where do appeals go?
Sources & Official References
Other rules in Grays Harbor County
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