But the group behind the initiative has submitted another 250 signatures to replace the ones thrown out.
The group - Yes! For SeaTac - says the judge ruled that SeaTac Proposition 1 was 17 signatures short of the required threshold to put the initiative on the city ballot. Group spokeswoman Heather Weiner says the judge threw out some duplicate signatures.
The union-backed SeaTac initiative is opposed by various business groups, which have channeled nearly $250,000 to fight the campaign.
The state of Washington has one of the highest minimum wages in the nation at $9.19 an hour