Workers' compensation in Washington: Mandatory (monopolistic state fund). Coverage typically required at 1+ employee. Average premium runs $1.55 per $100 of payroll for a standard risk class. Market type: Monopolistic state fund.
Requirement Status
Mandatory
monopolistic state fund
Employee Threshold
1+ employee
Mandatory coverage trigger
Avg Cost Per $100 Payroll
$1.55
Standard risk class average
| Rule | Detail | Notes |
|---|---|---|
| Market type | Monopolistic state fund | Where you buy your policy |
| Employee threshold | 1+ employee | Trigger for mandatory coverage |
| Sole proprietor exemption | Sole proprietors and partners may voluntarily elect coverage through L&I; they are not required to do so. | Self-employed coverage rules |
| Industry-specific rules | All industries with 1+ employee covered through L&I. Private workers' comp insurance not permitted. Self-insurance is available for large qualifying employers. Agriculture: covered (farmworker coverage was expanded in recent years). | Higher-hazard industries have stricter rules |
Premium rates are state class-code-based. Construction, roofing, and trucking pay $5–$20+ per $100 of payroll; clerical and office work pays $0.10–$0.40. Experience modification factors (EMR) further adjust your final rate.
Washington operates a monopolistic workers' compensation system through the Department of Labor and Industries (L&I), which is the state's exclusive workers' comp carrier for employers who cannot or do not qualify for self-insurance. Private workers' comp insurance is not permitted in Washington. L&I administers a comprehensive system that covers medical treatment, wage replacement, vocational rehabilitation, and permanent disability benefits. Washington's economy is diverse — technology (Amazon, Microsoft, Boeing), agriculture (apples, hops, wine grapes), timber, fishing, and construction all generate significant workers' comp exposure. Washington recently expanded agricultural farmworker coverage to full equivalence with other workers, reversing historical limitations on farm labor benefits.
Washington's L&I system is funded through premiums split between employer and employee — Washington is one of the few states where workers pay a portion of the workers' comp premium. Premium rates are set by industrial classification and vary significantly across hazard levels. Large employers with sufficient financial resources can apply for self-insurance status, removing them from the L&I system entirely. Washington's recent expansion of farmworker coverage has significant implications for agricultural employers in eastern Washington, who must now account for full workers' comp costs for their workforce. Sole proprietors and partners are not required to enroll in L&I but may voluntarily do so, which provides medical and wage-replacement protection for working owners in hazardous industries.
Workers' comp pays medical bills + lost wages for injured workers and provides 'exclusive remedy' protection — employees generally can't sue you for workplace injuries when coverage is in place. Operating without required WC can mean massive personal liability and state penalties.
Washington is one of four monopolistic states — the Department of Labor and Industries (L&I) is the sole workers' comp provider. Washington recently expanded agricultural farmworker coverage to be equivalent to other workers.
Washington is a monopolistic state — you must purchase workers' comp from the state fund only. Private carriers cannot sell WC here. For coverage outside the state fund (employer's liability), you need a separate stop-gap endorsement.
💡 Washington Pro Tip
Yes. Washington is one of four monopolistic states — all employers with one or more employees must obtain workers' comp coverage through L&I. Private workers' comp insurance is not available for standard employers. Out-of-state employers bringing workers into Washington must also secure L&I coverage or have their state's policy endorsed for Washington work. Agricultural farmworkers are now fully covered equivalent to other workers.
Washington's average workers' comp cost is approximately $1.55 per $100 of payroll through L&I. Timber, fishing, and roofing carry some of the highest rates in the state, while technology, retail, and office work are under $0.60. Washington is unique in that employees pay a portion of the workers' comp premium — about one-third of the total rate in most classifications.
Sole proprietors and partners are not required to enroll in L&I in Washington. Voluntary enrollment through L&I is available and advisable for sole proprietors in logging, construction, fishing, or agricultural work. Without voluntary coverage, you personally bear full financial risk for any on-the-job injury. Washington also allows self-insurance for large qualifying employers as an alternative to L&I.
Compliance rules from Washington's Department of Labor and Workers' Compensation Commission; rate averages reflect 2026 NCCI loss cost filings and state fund rate orders.
Sarah Mitchell
Editorial Lead, Catastrophe & Commercial Property
This article was researched and written by the Cover Forge USA editorial team against federal sources (NAIC, CMS, FEMA, DOL, SSA, state DOIs) and standard policy forms. Bylines organize content by topic — they do not assert individual licensure. See our editorial-policy for details.
Reviewed May 2026
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This site provides general educational information only and is not a substitute for professional insurance advice. All rates, data, and coverage details are estimates and may not reflect your actual premiums. Insurance availability and pricing vary by state, insurer, and individual risk factors. Always consult a licensed insurance professional in your state before making coverage decisions.