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2_3_d__2_The King County Sheriff’s Office Marine Rescue Dive Unit (MRDU) deploys specially trained and equipped Deputies that are responsible for water related law enforcement, rescue and recovery work within the unincorporated areas of King County and cities/towns that contract for service.  These areas include Puget Sound, Lake Washington, Lake Sammamish and numerous other lakes, ponds, rivers and streams throughout King County. Our primary goal is to promote safe, enjoyable water related recreation throughout King County.

Marine Rescue Dive Unit services include:
• Regular patrols by boat
• Marine related law enforcement (including Boating Under the Influence (BUI) investigation)
• Vessel/watercraft inspections
• Emergency response and rescue
• Vessel/watercraft firefighting and dewatering
• Vessel/watercraft accident investigation
• Drowning victim recovery
• Underwater evidence recovery
• Swift water river rescue
• Marine related oil spill response
• Public safety SCUBA diving
• Boater/water safety education (includes community and school events).
• Ice rescue.
• Maritime Security Operations.


Dive (SCUBA)

Marine2Deputies are trained and certified public safety SCUBA divers that often dive in waters with little to no visibility. Deputies receive specialized training in evidence searches, drowning recoveries and underwater vehicle recoveries. Deputies utilize underwater cameras, metal detectors and a remotely operated underwater vehicle (ROV).


Swift Water Rescue

MRDUriverPicDeputies are also trained and certified in swift water river rescue, recovery and evidence collection. Deputies utilize special equipment to conduct rescues and recoveries in and around rivers.  Deputies can be lowered by helicopter (hoist) into remote and hard to reach areas to effect a river or lake rescue or recovery.

Marine Rescue Dive Unit Deputies conduct regular training to remain proficient with diving, river, hoist and other related skills.Marine3

Primary MRDU Vessels

Lake Washington
The primary patrol boat on Lake Washington is a 38 foot aluminum boat custom built by Moose Boats and powered by twin 420 horsepower diesel engines with jet drives. This boat is equipped with radar, GPS, communications and firefighting / dewatering capabilities. It has an excellent platform for SCUBA diving and is a regional support platform for long term operations and recovery missions. 

Lake Sammamish
The primary patrol boat on Lake Sammamish is a 26 foot aluminum Pacific Skiff boat.  This boat is equipped with radar, GPS, communications and firefighting / dewatering capabilities. .

Puget Sound
The primary patrol boat on Puget Sound is a 41 foot boat built by SAFE Boats.  This boat is equipped with radar, GPS, forward looking infrared (FLIR), communications and firefighting / dewatering capabilities.  It can be utilized as an interdiction vessel and is a regional support platform for on-water tactical events. 

The MRDU also has several smaller boats of various sizes and types that can be deployed to other bodies of water almost anywhere when needed. 

Call 911 For Marine Emergencies

Contact Us

Marine Unit
5165 Carillon Pt
Kirkland, WA 98033
Phone: (206) 477-3790
Fax: (206) 205-5371

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Our City Partners

Beaux Arts Village
Yarrow Point

Marine Event Permit Application

Please mail or fax the application to the unit, and allow sufficient time for processing.

Derelict Vessel Prevention Program

Learn how to identify and report derelict vessels in your area.

Mandatory Boater Education Card

State law requires all Washington residents born after January 1, 1955 who operate powered watercraft 15 horsepower or greater, to carry a Washington Boater Education Card 


You must be at least 14 years old to operate a personal watercraft. Remember, it is illegal to lease, hire, or rent a personal watercraft to anyone under 16 years old.

Related Information

Washington State Laws of Recreational Boating

Washington State Recreation and Conservation Office

Washington State Parks Boating Program