Plumbers Insurance Requirements in Washington
What Washington property managers should require from plumbers vendors
GL Minimum: $1,000,000/$2,000,000WA override
Workers Comp: Required
State License Required
If you manage properties in Washington and hire plumbers contractors, verifying their insurance coverage is not optional. Washington law requires workers compensation for employers with 1+ employees, and commercial property owners are expected to verify adequate general liability coverage before allowing any contractor on site.
Washington-Specific Note
Washington's monopolistic WC fund means no private carrier shopping for plumbers. Earthquake risk from the Cascadia Subduction Zone creates significant pipe rupture exposure. L&I manages both WC and plumber licensing, creating a unified regulatory framework.
Plumbers Insurance Requirements in Washington
| Coverage Type | Recommended Minimum |
|---|---|
General Liability | $1,000,000 / $2,000,000 |
Workers Compensation | Required (1+ employees) |
Commercial General Liability | $1,000,000 / $2,000,000 |
Workers' Compensation | Statutory limits |
Commercial Auto | $1,000,000 combined single limit |
Pollution Liability | $500,000 |
Umbrella / Excess Liability | $1,000,000 |
Washington-Specific Risks for Plumbers
Earthquake-induced pipe ruptures (Cascadia Subduction Zone)
Constant moisture causing pipe corrosion
Stormwater management system liability
Required Endorsements in Washington
- Earthquake pipe rupture endorsement
- Water damage/flood-back rider
National Guide
Plumbers Insurance Requirements
State Guide
Washington Insurance Requirements
Frequently Asked Questions
Why is completed operations coverage especially important for plumbing work?▼
Plumbing failures often do not become apparent until days, weeks, or even months after the work is completed. A slow leak from an improperly soldered joint can cause extensive mold growth and structural damage behind walls before it is detected. Completed operations coverage ensures the plumber's GL policy will respond to claims arising from their work after the project is finished.
Should I require higher GL limits for plumbers doing gas line work?▼
Yes. Gas line work introduces explosion and carbon monoxide risks that significantly increase liability exposure. Most property managers require $2M per occurrence and $4M aggregate for plumbers performing gas piping installation or repair. Verify that the plumber holds a separate gas fitting license or certification as required by your jurisdiction.
What is pollution liability and do I need it from my plumber?▼
Pollution liability covers claims arising from the release of contaminants, which is relevant for plumbers who work on sewer lines, septic systems, or waste piping. A sewer backup can introduce raw sewage into occupied spaces, creating a health hazard and costly cleanup. If your plumber performs any sewer or drain work, requiring $500K in pollution liability is a prudent risk management measure.
How do I handle a plumbing contractor who says they are a sole proprietor with no employees?▼
Even sole proprietors should carry general liability insurance. While workers' compensation requirements vary by state for sole proprietors, many jurisdictions treat uninsured subcontractors as employees of the hiring entity. This means if an uninsured plumber is injured on your property, your workers' compensation policy may be responsible. Require all plumbing contractors to carry WC regardless of employee count, or obtain a state-issued exemption certificate.
What should I look for on a plumber's COI before approving work?▼
Verify that the GL policy is current, includes completed operations coverage, and meets your minimum limits ($1M/$2M minimum). Confirm the property owner is listed as additional insured. Check that workers' compensation is active with statutory limits. For gas work, verify the higher $2M/$4M GL limits and ensure the plumber's license covers gas fitting.
Do plumbers in Washington need a license?▼
Washington L&I licenses plumbing contractors. Must hold a journeyman plumber certificate and contractor registration under RCW 18.27. Surety bond required.
What happens if my plumbers's insurance expires in Washington?▼
In Washington, you as the property manager could be held liable for injuries or damages caused by an uninsured plumbers on your property. Washington courts have consistently ruled that property owners have a duty to verify contractor insurance before allowing work to begin.
Track Plumbers COIs in Washington Automatically
Upload a plumbers's certificate, and COIPulse checks it against Washington requirements instantly. No spreadsheets, no manual verification.