About one in 10 King County residents has had to call 911 for Medic One/Emergency Medical Services (EMS). The countywide system responds to a medical emergency every three minutes.

The property-tax levy that supports the King County EMS levy is before voters again, on the Nov. 5 ballot. If it passes, it will cost the average King County household about $107 a year until it expires again in 2019. That’s $3 less than homeowners have been paying each year under the expiring levy.

The rate is 33.5 cents per $1,000 of assessed home value, for six years. It would raise nearly $700 million for emergency services.

King County’s EMS system serves about 2 million people and has the highest reported survival rate of cardiac arrest — 57 percent, according the Public Health — Seattle & King County.

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The system was established in 1970 and has been supported by levy since 1979. Voters have passed the levy six times. In 2007, the levy passed with 83 percent approval. This year there is no campaign against it.

Emily Heffter: 206-464-8246 or eheffter@seattletimes.com. On Twitter: @EmilyHeffter