Tunnel Construction workers comp rate in Washington
The filed workers comp rate for class code 6604 (Tunnel Construction) in Washington is $0.342 per $100 of payroll , effective 2026-01-01. On $500,000 of payroll, that's roughly $1,711 in base premium.
Rate per $100 $0.342
Rate type manual_rate
Authority NCCI / state rating bureau
Effective 2026-01-01
Confidence HIGH
FAQ
What is the workers comp rate for code 6604 in Washington?
The filed workers comp loss cost / rate for NCCI class code 6604 (Tunnel Construction) in Washington is $0.342 per $100 of payroll, effective 2026-01-01.
How much would I pay in Washington for code 6604 on $500,000 of payroll?
At $0.342 per $100, $500,000 of payroll yields a base premium of $1,711 before experience modifier and schedule credits. Actual cost varies by carrier and underwriting.