Mercer Island Police Department

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Mercer Island, WA
Mercer Island Police Department

Official page for City of Mercer Island's Police Department. Dial 911 for emergency. Police Operations includes the Marine Patrol and the Patrol Section.

DISCLAIMER: If you are experiencing an emergency, immediately DIAL 911 to report your emergency. This Facebook site is NOT monitored 24/7, and is NOT used for the reporting or dispatching of the Mercer Island Police Department and/or Fire Department services. TERMS OF USE: Click www.mercergov.org/Page.asp?NavID=2966
for full guidelines on using this page. BACKGROUND:
The Mercer Island Po

lice Department strives to provide a full range of police services while respecting individual rights and freedoms. We provide a wide range of services to the people who live and work on Mercer Island. Information about our services are readily available through this page and on the City of Mercer Island's website at www.mercergov.org

The Police Department is divided into the Police Operations unit and the Administrative Services unit. Administrative Services includes the Criminal Investigations Section (Detectives), the Services Section (Dispatch, Records, and Evidence Room), and a Training and Personnel Sergeant. The following are some of the services provided:

Proactive/Routine patrol, including the enforcement of criminal and traffic law

Answering calls for service and taking appropriate police action

Follow-up investigations of criminal cases

Bicycle patrol of Mercer Island special events, the Central Business District, Mercer Island parks, and the I-90 right of way

Marine Patrol in the waters of Mercer Island, Renton, and Bellevue

Community Oriented Policing (COP) and Emergency Preparedness programs

Dive Team and water rescue operations/services

Special Operations Team (SOT) that handles high risk operations/situations

06/17/2026

Planning to attend a World Cup match? Be part of the majority and plan your ride home ahead of time!

Did you know that most young adults in Washington already choose safety? According to data from https://moststeerclear.org/, 9 out of 10 young adults DON’T drive under the influence of cannabis or alcohol. Let's keep Mercer Island roads safe for everyone.

📱 Plan ahead and designate a sober driver.
🚆 Take transit like the Link Light Rail right from Mercer Island Station.
🚕 Use a rideshare app or call a cab.

When it comes to driving under the influence, Most Steer Clear. Follow the majority and do your part to protect our community!

06/16/2026

The next World Cup match is coming up this Friday at noon, featuring a highly anticipated showdown as Team USA takes on Australia! While Monday's game went smoothly, with no major issues, this match is expected to bring significantly more traffic and region-wide congestion.

To avoid delays, fans are strongly advised to arrive early to secure a spot in parking lots around Mercer Island Station before they fill up. Biking to the station is also a great option, with multiple lockers available (bikes are not allowed on trains on World Cup match days). As always, taking light rail is the best way to get to Seattle Stadium (Lumen Field). Full details and parking options: https://www.mercerisland.gov/worldcup

06/15/2026

🐾 Keep Pets Out of Cars Today! 🐾

With temperatures forecasted to soar to 90°F or more today, vehicles will quickly become deadly ovens. When it's that hot outside, the inside of a car can spike past 110°F in minutes, causing rapid organ failure, brain damage, or death.

Under Washington State Law (RCW 16.52.340), it is illegal to leave an animal unattended in a vehicle if they could be harmed by excessive heat. Law enforcement is authorized to use any reasonable means—including breaking windows—to rescue a suffering animal.

If you see a pet in a hot car, don't leave. Try to locate the owner immediately. If you can't find them, call 911 immediately.

Watch for signs of distress: excessive panting or labored breathing, excessive drooling, bright red gums, dizziness, disorientation, or listlessness/non-responsiveness.

🏥 If a distressed animal is removed, Take them straight to a veterinary clinic for evaluation and emergency care.

06/12/2026

🥵 HEAT ADVISORY: SUNDAY 11 AM – TUESDAY 5 AM 🥵

Mercer Island and Western Washington is under a National Weather Service Heat Advisory, with temperatures expected to climb into the upper 80s and low 90s.

🏢 Need to cool off? The Mercer Island Community and Event Center (MICEC) will be open this Monday, June 15, as a cooling center until 7 p.m. Stop by to cool off in an air-conditioned space!

Stay safe and beat the heat:

🥤 Hydrate: Drink plenty of fluids throughout the day.

🏠 Stay in the shade: Avoid direct sun during peak hours; check on vulnerable neighbors and relatives.

🚗 Look Before You Lock: Never leave children or pets in a parked car for any reason.

⏰ Shift Your Schedule: Reschedule strenuous outdoor activities to early morning or late evening.

⚠️ Heat stroke is a medical emergency. If you or someone you know shows signs of severe heat illness, move to a cool area and call 911 immediately.

06/11/2026

Hot weather is here! The temperatures are forecast to rise into the upper 80s (possibly hitting 90 degrees) over the next few days. As you head to the Mercer Island shoreline to cool off, stay alert to hidden dangers. The Mercer Island Police Department’s Marine Patrol Unit actively patrols the coast to keep the public safe and has already removed tons of debris left by recent flooding. However, submerged hazards may still be present, risking entanglement or drowning.

Remember that Lake Washington remains deceptively cold beneath the surface, which can quickly trigger muscle failure or hypothermia, even if the air temperature is hot. Preventable drownings remain elevated across King County, with Lake Washington accounting for nearly 30% of recent open-water fatalities. Exercise caution by never swimming alone, using a lifejacket, and staying within designated swimming areas and close to shore. Visit King County's website for more tips to swim safely: https://link.orlo.us/txuoM

06/02/2026

☀️ Temperatures are warming up today however Lake Washington water temperature remains cold! Make sure to always wear a life jacket in & around the water. Keep a close eye on children & pets near the water as well. Never leave people or pets unattended in the car - no matter how short the errand.

05/30/2026

You and your dog are invited to join a Paws on Patrol Meetup on Saturday, June 6, from 10 a.m. to 12 p.m. at the grassy area between the Mercer Island Police Department (MIPD) headquarters and City Hall (9611 SE 36th St). Please ensure your dog is leashed and well-behaved. No dog? No problem – all are welcome to attend.

Paws on Patrol is a crime prevention partnership between MIPD and dog walkers in the community to increase the number of eyes and ears in neighborhoods across the Island. Team members receive training in observing and reporting suspicious activity in progress. Register for the program ahead of the meetup (https://www.mercerisland.gov/police/webform/paws-patrol-registration) and learn more about Paws on Patrol: https://www.mercerisland.gov/police/page/paws-patrol

05/29/2026

Mercer Island and the Puget Sound region have entered prime boating season! The Mercer Island Police Department’s Marine Patrol Unit serves a vital role in keeping our waters safe, but you can do your part. Remember that all persons age 50 and under are required to take or have taken an approved boating education course to operate a boat with a motor stronger than 15 hp: https://www.mercerisland.gov/police/page/its-law-mandatory-boater-safety-education

To ensure everyone’s safety:
- Carry U.S. Coast Guard-approved life jackets for every passenger on board a vessel
- Never operate a vessel under the influence of alcohol or drugs
- Check weather forecasts before leaving, especially if venturing far from shore
- Know and your respect your ability (and limits) to safely operate a boat

Additional safety tips: https://www.mercerisland.gov/police/page/stay-safe-water-boating-season

05/22/2026

King County Sheriff's Office presented Mercer Island Police Department Officers Shannon Johnson (pictured, at left) and Jordan Tranter (second from right) with the King County Lifesaving Award for their heroic actions during an ice rescue that occurred on Fish Lake in Chelan County in early February.

KCSO Special Operations Division Chief Jose Marenco (right) and King County Marine Patrol Sergeant Rich Barton (second from left) presented the awards in recognition of the officers’ swift response and lifesaving efforts after a person fell through the ice. They were part of a 20-person crew who were fortuitously participating in an ice rescue training session nearby when they witnessed a man punch through the ice and into the 35-degree water. The entire team sprang into action to pluck the man from the icy water, saving his life.

The professionalism, teamwork, and dedication to public safety of Officers Tranter and Johnson reflect the highest standards of service and commitment to the community.

Address

9611 SE 36th Street
Mercer Island, WA
98040

Telephone

+12062757610

Website

https://www.mercerisland.gov/police

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